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• How faster is using an internal IP address instead of an external one?

  - by user349603

  I have a mailing list application that sends emails through several dedicated SMTP servers (running Linux Debian 5 and Postfix) in the same network of a hosting company. However, the application is using the servers' external IP addresses in order to connect to them over SMTP, and I was wondering what kind of improvement would be obtained if the application used the internal IP addresses of the servers instead? Thank you in advance for your insight.

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• Accessing C$ over LAN on Win2008R2 - cannot by hostname but can by IP and FQDN

  - by Idgoo

  Having an issue with one of our Win2k8 R2 file servers. Trying to access C$ or the Admin share is giving us an error (see error details that the bottom), however we are able to connect using the server's IP and FQDN. can access \\172.16.x.x\c$ with domain cred can access \\server.domain.local\c$ with domain creds cannot access \\servername\c$ with same domain creds Server pings fine with Hostname, IP, FQDN, the Primary DNS suffix is also correct. DNS, PTR and Wins records are all correct for the Server I have checked that I am not trying to connect with cached credentials in the Windows vault, the server is also appending primary and connection specific DNS suffixes to the hostname. Any ideas what might be causing this issue? Error Details: c$ is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions

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• Using combo boxes with a binding source and multiple tables

  - by Scott Chamberlain

  I have two data tables in a data set for example lets say Servers: | Server | Ip | Users: | Username | Password | ServerToConnectTo | and there is a foreign key on users that points to servers. How do I make a combo box that list all of the servers. Then how do I make the selected server in that combo box be saved in the data set in the ServerToConnect to column.

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• JPA in distributed Java EE configuration

  - by sof

  Hello, I'm developing a JEE application to run on Glassfish: Database (javaDB, MS SQL, MySQL or Oracle) EJB layer with JPA (Toplink essentials - from Glassfish) for database access JSF/Icefaces based web UI accessing the EJB layer The application will have a lot of concurrent web client, so I want to run it on different physical servers and use a load-balancer. My problem is now how to keep the applications synchronized. I intend to set up multiple servers, each running Glassfish with my EAR app installed. Whenever on one of the servers data is added to or removed from the database (via JPA, no direct SQL queries), this change should be reflected in the JPA layer on the other servers. I've been looking around for solutions to this, but couldn't find anything I really like (the full Toplink from Oracle claims to have a solution, but don't know). Doing a refresh before every access to a JPA entity could work, but is far from efficient. Are there any patterns, libraries, ... that could help here? Thanks a lot!

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• Forwarding HTTP Request with Direct Server Return

  - by Daniel Crabtree

  I have servers spread across several data centers, each storing different files. I want users to be able to access the files on all servers through a single domain and have the individual servers return the files directly to the users. The following shows a simple example: 1) The user's browser requests http://www.example.com/files/file1.zip 2) Request goes to server A, based on the DNS A record for example.com. 3) Server A analyzes the request and works out that /files/file1.zip is stored on server B. 4) Server A forwards the request to server B. 5) Server B returns file1.zip directly to the user without going through server A. Note: steps 4 and 5 must be transparent to the user and cannot involve sending a redirect to the user as that would violate the requirement of a single domain. From my research, what I want to achieve is called "Direct Server Return" and it is a common setup for load balancing. It is also sometimes called a half reverse proxy. For step 4, it sounds like I need to do MAC Address Translation and then pass the request back onto the network and for servers outside the network of server A tunneling will be required. For step 5, I simply need to configure server B, as per the real servers in a load balancing setup. Namely, server B should have server A's IP address on the loopback interface and it should not answer any ARP requests for that IP address. My problem is how to actually achieve step 4? I have found plenty of hardware and software that can do this for simple load balancing at layer 4, but these solutions fall short and cannot handle the kind of custom routing I require. It seems like I will need to roll my own solution. Ideally, I would like to do the routing / forwarding at the web server level, i.e. in PHP or C# / ASP.net. However, I am open to doing it at a lower level such as Apache or IIS, or at an even lower level, i.e. a custom proxy service in front of everything.

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• CakePHP HABTM Filtering

  - by James Haigh

  Hi, I've got two tables - users and servers, and for the HABTM relationship, users_servers. Users HABTM servers and vice versa. I'm trying to find a way for Cake to select the servers that a user is assigned to. I'm trying things like $this->User->Server->find('all'); which just returns all the servers, regardless of whether they belong to the user. $this->User->Server->find('all', array('conditions' => array('Server.user_id' => 1))) just gives an unknown column SQL error. I'm sure I'm missing something obvious but just need someone to point me in the right direction. Thanks!

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• Eliminate single point of failure for webservers?

  - by George Bailey

  I know in DNS, that each of the DNS servers will be tried to see if they will respond I know in email that in the event of a failure it will go to the next one in the list or it will hold the mail for a period of time As far as I know,, in webservers,, the browser will get one of the webserver IP addresses and try it and if it fails it will give up. Is this correct? If so,, then the only way to direct traffic away from a failed IP address would be with the DNS servers.. and even that would not update immediately?

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• how do you setup apache web server in netbeans 6.8?

  - by dde

  I'd like to debug PHP apps, but I want to setup Apache web server (httpd.exe). I right clicked SERVERS, Add Server..., then noticed there is no option for httpd.exe, just for Glashfiish, JBoss, Apache Tomcat, and some other servers. So, how can I add Apache Web Server (right from within the IDE just like other servers), and then properly debug PHP apps?

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• Is it possible to cause email to my domain to be handled by gmail?

  - by pitosalas

  [This is a very narrow question, and I don't think it is covered in similar sounding questions] I want to configure my server's DNS so that when someone sends email to [email protected] it is actually deliver it to [email protected] Note: My question is whether this is possible to do ONLY with DNS not with myserver.com's own sendmail. I think the answer is "NO" it is not possible, because when I add an MX record to DNS the email that was delivered to gmail's SMPT server would be TO: [email protected] and it would not know that account. (But I hasten to add that I am just vaguely starting to grok how this all works.)

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• Setting Up DHCP Server as Failover

  - by Jason Buhagiar

  I have 2 Domain Controllers running at my company; DC1 has the following roles; ADDS DNS DHCP Scope - 192.168.2.100 - 192.168.2.240 DC2 has the following roles; ADDS - Replicated DNS - Secondary DNS I also have 2 PFSense Gateways both have a different ISP Connection, DHCP Relay is not enabled on any of the machines. Can anyone suggest a way for me to install DHCP Server as FAilover on DC2 please, should I use split scope etc... Help is much appreciated :) Thanks.

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• How to deploy to Tomcat from NetBeans?

  - by deamon

  I've added Tomcat in the "Tools Servers" menu and as you can see it appears in the list of servers: But when I try to run my project, I cannot select Tomcat! The drop-down with servers is empty. I tried it with NetBeans 6.8 and 6.9 Beta. Any idea?

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• How to replicate data with memcache

  - by Industrial

  Hi everyone, I am trying to find good resources on best practices to data replication across memcache servers. What I want to accomplish is that if one of my servers in my pool goes down, the next server in line already has the info set. I have found "repcached" but since I run a WIN32 test environment, I have been unable to install it. So what's our alternatives on how to replicate data between servers? Thanks,

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• Intel Corporation Ethernet Connection does not start properly

  - by Oscar Alejos

  I'm experiencing some problems when trying to connect my PC to the router through a switch. When the PC is directly connected to the router, everything works fine, Ubuntu (14.04) starts normally, and the Internet connection runs inmediately. The Ethernet controller is the Intel Corporation Ethernet Connection, as lspci returns: $ lspci | grep Eth 00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V (rev 04) However, when I try to connect through the switch what I get is the following. dmesg returns: $ dmesg | grep eth [ 1.035585] e1000e 0000:00:19.0 eth0: registered PHC clock [ 1.035587] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) 00:22:4d:a7:be:5d [ 1.035589] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection [ 1.035625] e1000e 0000:00:19.0 eth0: MAC: 11, PHY: 12, PBA No: FFFFFF-0FF [ 1.357838] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 2.165413] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 2.165574] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 2.641287] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 16.715086] e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx/Tx [ 16.715090] e1000e 0000:00:19.0 eth0: 10/100 speed: disabling TSO [ 16.715117] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready It looks like eth0 is properly working. Actually, nm-tool returns: $ nm-tool - Device: eth0 [Conexión cableada] ------------------------------------------- Type: Wired Driver: e1000e State: connected Default: yes HW Address: 00:22:4D:A7:BE:5D Capabilities: Carrier Detect: yes Speed: 100 Mb/s Wired Properties Carrier: on IPv4 Settings: Address: 192.168.1.30 Prefix: 24 (255.255.255.0) Gateway: 192.168.1.1 DNS: 80.58.61.250 DNS: 80.58.61.254 DNS: 192.168.1.1 However, ping returns: $ ping 192.168.1.1 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. From 192.168.1.30 icmp_seq=1 Destination Host Unreachable From 192.168.1.30 icmp_seq=2 Destination Host Unreachable From 192.168.1.30 icmp_seq=3 Destination Host Unreachable The connection is restored by restarting it: # ifconfig eth0 down # ifconfig eth0 up From this point on, everything runs smoothly, as if the PC were directly connected to the router. It seems to be an issue related to the integrated LAN adaptor and the Ethernet controller, since my laptop connects without any problem. My desktop board is an Intel DB85FL. I'd be grateful if anyone could give some ideas on how to solve this issue. Thank you in advance.

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• Step by Step Install of MAAS and JUJU

  - by John S

  I am working on understanding the pieces that I am missing in being able to deploy Juju across the other MAAS nodes. I don't know If I have a step out of place, or missing a few. The server owns the router which handles the DHCP and DNS. Any assistance is greatly appreciated. When I am at the end I will either get a 409 error, or arbitrary pick tools 1.16.0 error. It is worth mentioning that local, and aws works fine. Hopefully with all of these steps spelled out it will help someone else along the way too. Steps Setting Up MAAS and JUJU - 12.04 LTS Clean install SSH only from the package selection during install sudo apt-get install software-properties-common sudo apt-get install python-software-properties sudo add-apt-repository ppa:maas-maintainers/stable sudo add-apt-repository ppa:juju/stable sudo apt-get update sudo apt-get dist-upgrade sudo reboot sudo apt-get install maas maas-dns maas-dhcp sudo ufw disable sudo reboot - edit /etc/dhcp/dhcpd.conf authoritive subnet 10.0.0.0 netmask 255.255.255.0 { next-server 10.0.0.2; filename "pxelinux.0"; } sudo maas createsuperuser sudo maas-import-pxe-files Login to MAAS http://10.x.x.x/MAAS cluster controller configuration for eth0 manage dhcp and dns IP 10.0.0.2 subnet 255.255.255.0 broadcast 10.0.0.0 routerip 10.0.0.1 ip low 10.0.0.5 ip high 10.0.0.180 Commissioning default and distro is set at 12.04 default domain is at local sudo maas-cli login maas http://10.x.x.x/MAAS/api/1.0 api-key ssh-keygen -t rsa -b 2048 - enter - no password - cat id_rsa.pub and enter key into MAAS ssh sudo maas-cli maas nodes accept-all (interestingly enough I only get back [] when executing this ) PXE one machine, accept and commision, start and deploy. sudo apt-get install juju-core juju-local MAAS config: maas: type: maas maas-server: '://10.x.x.x:80/MAAS' maas-oauth: 'MAAS_API_KEY' admin-secret: 'nothing' default-series: 'precise' juju switch maas sudo juju bootstrap --show-log

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• How to use Nginx to export the mongoDB connection?

  - by Totty

  I have on my server 2 things: the node.js server and a mongodb database; The node.js server is reachable from myip/server; and now I would like to export the mongodb database to myip/database for example. Now when I use my mongodb viewer (MongoVUE) with "http://myip/database:9000" (the port 9000 is set in nginx and it's also the port that I start mongod). If I go to "http://myip/database:9000" or "http://myip/database" in a browser it look like: "You are trying to access MongoDB on the native driver port. For http diagnostic access, add 1000 to the port number". But in MongoVUE it says: Unable to connect to server 192.168.1.16/database:9000: No such host is known. Type: MongoDB.Driver.MongoConnectionException Stack: at MongoDB.Driver.Internal.DirectConnector.Connect(TimeSpan timeout) at MongoDB.Driver.MongoServer.Connect(TimeSpan timeout, ConnectWaitFor waitFor) at MongoDB.Driver.MongoServer.Connect(TimeSpan timeout) at MongoDB.Driver.MongoServer.Connect() at MangoUI.MMongo.FQlxNlJKqO74gYmXgZR4(Object ) at MangoUI.MMongo.Open(Boolean useSamus) at MangoUI.MMongo.Open() at MangoUI.ComNavTree.wJQdUqApCpjoC39P59n(Object ) at MangoUI.ComNavTree.ExpandMe(MTreeNode expand) at MangoUI.ComNavTree.tree_BeforeExpand(Object sender, TreeViewCancelEventArgs e) No such host is known Type: System.Net.Sockets.SocketException Stack: at System.Net.Dns.GetAddrInfo(String name) at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6) at System.Net.Dns.GetHostAddresses(String hostNameOrAddress) at MongoDB.Driver.MongoServerAddress.ToIPEndPoint(AddressFamily addressFamily) at MongoDB.Driver.MongoServerInstance.Connect(Boolean slaveOk) at MongoDB.Driver.Internal.DirectConnector.Connect(TimeSpan timeout)

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• Cannot ping router with a static IP assigned?

  - by Uriah

  Alright. I am running Ubuntu LTS 12.04 and am trying to configure a local caching/master DNS server so I am using Bind9. First, here are some things via default DHCP: /etc/network/interfaces cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet dhcp # The primary network interface - STATIC #auto eth0 #iface eth0 inet static # address 192.168.2.113 # netmask 255.255.255.0 # network 192.168.2.0 # broadcast 192.168.2.255 # gateway 192.168.2.1 # dns-search uclemmer.net # dns-nameservers 192.168.2.113 8.8.8.8 /etc/resolv.conf cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 192.168.2.1 search uclemmer.net ifconfig ifconfig eth0 Link encap:Ethernet HWaddr 00:14:2a:82:d4:9e inet addr:192.168.2.103 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::214:2aff:fe82:d49e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1067 errors:0 dropped:0 overruns:0 frame:0 TX packets:2504 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:153833 (153.8 KB) TX bytes:214129 (214.1 KB) Interrupt:23 Base address:0x8800 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:915 errors:0 dropped:0 overruns:0 frame:0 TX packets:915 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:71643 (71.6 KB) TX bytes:71643 (71.6 KB) ping ping -c 4 192.168.2.1 PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data. 64 bytes from 192.168.2.1: icmp_req=1 ttl=64 time=0.368 ms 64 bytes from 192.168.2.1: icmp_req=2 ttl=64 time=0.224 ms 64 bytes from 192.168.2.1: icmp_req=3 ttl=64 time=0.216 ms 64 bytes from 192.168.2.1: icmp_req=4 ttl=64 time=0.237 ms --- 192.168.2.1 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 2997ms rtt min/avg/max/mdev = 0.216/0.261/0.368/0.063 ms ping -c 4 google.com PING google.com (74.125.134.102) 56(84) bytes of data. 64 bytes from www.google-analytics.com (74.125.134.102): icmp_req=1 ttl=48 time=15.1 ms 64 bytes from www.google-analytics.com (74.125.134.102): icmp_req=2 ttl=48 time=11.4 ms 64 bytes from www.google-analytics.com (74.125.134.102): icmp_req=3 ttl=48 time=11.6 ms 64 bytes from www.google-analytics.com (74.125.134.102): icmp_req=4 ttl=48 time=11.5 ms --- google.com ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 11.488/12.465/15.118/1.537 ms ip route ip route default via 192.168.2.1 dev eth0 metric 100 192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.103 As you can see, with DHCP everything seems to work fine. Now, here are things with static IP: /etc/network/interfaces cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface #auto eth0 #iface eth0 inet dhcp # The primary network interface - STATIC auto eth0 iface eth0 inet static address 192.168.2.113 netmask 255.255.255.0 network 192.168.2.0 broadcast 192.168.2.255 gateway 192.168.2.1 dns-search uclemmer.net dns-nameservers 192.168.2.1 8.8.8.8 I have tried dns-nameservers in various combos of *.2.1, *.2.113, and other reliable, public nameservers. /etc/resolv.conf cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 192.168.2.1 nameserver 8.8.8.8 search uclemmer.net Obviously, when I change the nameservers in the /etc/network/interfaces file, the nameservers change here too. ifconfig ifconfig eth0 Link encap:Ethernet HWaddr 00:14:2a:82:d4:9e inet addr:192.168.2.113 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::214:2aff:fe82:d49e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1707 errors:0 dropped:0 overruns:0 frame:0 TX packets:2906 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:226230 (226.2 KB) TX bytes:263497 (263.4 KB) Interrupt:23 Base address:0x8800 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:985 errors:0 dropped:0 overruns:0 frame:0 TX packets:985 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:78625 (78.6 KB) TX bytes:78625 (78.6 KB) ping ping -c 4 192.168.2.1 PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data. --- 192.168.2.1 ping statistics --- 4 packets transmitted, 0 received, 100% packet loss, time 3023ms ping -c 4 google.com ping: unknown host google.com Lastly, here are my bind zone files: /etc/bind/named.conf.options cat /etc/bind/named.conf.options options { directory "/etc/bind"; // // // query-source address * port 53; notify-source * port 53; transfer-source * port 53; // If there is a firewall between you and nameservers you want // to talk to, you may need to fix the firewall to allow multiple // ports to talk. See http://www.kb.cert.org/vuls/id/800113 // If your ISP provided one or more IP addresses for stable // nameservers, you probably want to use them as forwarders. // Uncomment the following block, and insert the addresses replacing // the all-0's placeholder. // forwarders { // 0.0.0.0; // }; forwarders { // My local 192.168.2.113; // Comcast 75.75.75.75; 75.75.76.76; // Google 8.8.8.8; 8.8.4.4; // DNSAdvantage 156.154.70.1; 156.154.71.1; // OpenDNS 208.67.222.222; 208.67.220.220; // Norton 198.153.192.1; 198.153.194.1; // Verizon 4.2.2.1; 4.2.2.2; 4.2.2.3; 4.2.2.4; 4.2.2.5; 4.2.2.6; // Scrubit 67.138.54.100; 207.255.209.66; }; // // // //allow-query { localhost; 192.168.2.0/24; }; //allow-transfer { localhost; 192.168.2.113; }; //also-notify { 192.168.2.113; }; //allow-recursion { localhost; 192.168.2.0/24; }; //======================================================================== // If BIND logs error messages about the root key being expired, // you will need to update your keys. See https://www.isc.org/bind-keys //======================================================================== dnssec-validation auto; auth-nxdomain no; # conform to RFC1035 listen-on-v6 { any; }; }; /etc/bind/named.conf.local cat /etc/bind/named.conf.local // // Do any local configuration here // // Consider adding the 1918 zones here, if they are not used in your // organization //include "/etc/bind/zones.rfc1918"; zone "example.com" { type master; file "/etc/bind/zones/db.example.com"; }; zone "2.168.192.in-addr.arpa" { type master; file "/etc/bind/zones/db.2.168.192.in-addr.arpa"; /etc/bind/zones/db.example.com cat /etc/bind/zones/db.example.com ; ; BIND data file for example.com interface ; $TTL 604800 @ IN SOA yossarian.example.com. root.example.com. ( 1343171970 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; @ IN NS yossarian.example.com. @ IN A 192.168.2.113 @ IN AAAA ::1 @ IN MX 10 yossarian.example.com. ; yossarian IN A 192.168.2.113 router IN A 192.168.2.1 printer IN A 192.168.2.200 ; ns01 IN CNAME yossarian.example.com. www IN CNAME yossarian.example.com. ftp IN CNAME yossarian.example.com. ldap IN CNAME yossarian.example.com. mail IN CNAME yossarian.example.com. /etc/bind/zones/db.2.168.192.in-addr.arpa cat /etc/bind/zones/db.2.168.192.in-addr.arpa ; ; BIND reverse data file for 2.168.192.in-addr interface ; $TTL 604800 @ IN SOA yossarian.example.com. root.example.com. ( 1343171970 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; @ IN NS yossarian.example.com. @ IN A 255.255.255.0 ; 113 IN PTR yossarian.example.com. 1 IN PTR router.example.com. 200 IN PTR printer.example.com. ip route ip route default via 192.168.2.1 dev eth0 metric 100 192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.113 I can SSH in to the machine locally at *.2.113 or at whatever address is dynamically assigned when in DHCP "mode". *2.113 is in my router's range and I have ports open and forwarding to the server. Pinging is enabled on the router too. I briefly had a static configuration working but it died after the first reboot. Please let me know what other info you might need. I am beyond frustrated/baffled.

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• /etc/resolv.conf nameserver fd00::1

  - by user88631

  My /etc/resolv.conf constantly get a mysterious entry, i run a home network with ipv6 provided by ravd, the interface is auto-configured by Network manager (all name server lookups are lost when this line is first in my /etc/resolv.conf) . Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) **# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN** nameserver fd00::1 nameserver 192.168.1.1 search home.int When ping is working cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 192.168.1.1 search home.int So something is putting fd00::1 at start of file, not if I ping6 fd00::1 I get Destination unreachable: Administratively prohibited To diagnose this I ran the router with single cable to connected to ubuntu machine. Ran tcpdump + restarted network on ubuntu. "tcpdump ip6 -e -i eth0 | grep fd00" finds nothing, it's not being advertised via the network.. The only hit I got was when an upstream router refused a connection attempt from the ubuntu machine to fd00::1. I have also switched on debug for network manager & it appears to set the mystery line.. 15:22:14 storage-pc NetworkManager[349]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) complete. 15:22:14 storage-pc NetworkManager[349]: <warn> dnsmasq exited with error: Other problem (5) 15:22:14 storage-pc NetworkManager[349]: <debug> [1346822534.281528] [nm-dns-manager.c:598] update_dns(): updating resolv.conf 15:22:14 storage-pc NetworkManager[349]: <debug> [1346822534.281875] [nm-dns-manager.c:719] update_dns(): DNS: plugin dnsmasq ignored (caching disabled) 15:22:14 storage-pc NetworkManager[349]: <info> ((null)): writing resolv.conf to /sbin/resolvconf 15:22:14 storage-pc dbus[2184]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' 15:22:14 storage-pc dnsmasq[2875]: reading /etc/resolv.conf 15:22:14 storage-pc dnsmasq[2875]: using nameserver 192.168.1.1#53 15:22:14 storage-pc dnsmasq[2875]: using nameserver fd00::1#53 Any suggestions on how to find out where this comes from?

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• Domain transfer and New Hosting Management

  - by Anubhav Saini

  I wanted to migrate from my older registrar to GoDaddy. Main reason because current registrar/hosting provider doesn't support .NET. My old registrar gave me control over the domain and hosting account. So, basically I have everything I would need. ( I know theory only ) I applied for Transfer of domain, bought a hosting package from GoDaddy and uploaded new web site. So, I am waiting for domain transfer and it tells me that I have to wait for 5-7 days for approval. Okay. But today, my old registrar told/taunted me that I really didn't need to apply for transfer. What could possibly I have done differently? My domain expires on this 15th. Now I don't know much about how all of this really works, but I am guessing he meant, "you should have waited for 15 days and let it expire after which you should buy the domain as it is expired". Is it really so(I doubt) or there are some other ways I could have got same result but without transferring domain? (like, changing DNS entries) I have read like all of the documentation available on namecheap/GoDaddy/Whois about domain transfers. But maybe because I am new to this it is all confusing to me. I would also like to know what to do with DNS settings after transfer succeeds. I want to kill the old website. So, what nameserver settings I need to change, new one or old one or both? I have old host+old domain registrar + old working site on one hand, on the other hand, new site + pending domain transfer + new DNS settings.

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• Ditch cPanel / WHM in favour of manual seup

  - by BWRic

  We currently use cPanel / WHM on a reseller account but are looking at getting a dedicated server. My first thought was to duplicate this set up on the dedicated box to allow us to quickly create new accounts. I'll be a managed server so they'll have set up the LAMP stack. I'm curious if I actually need cPanel and WHM. We don't use many of the features from cPanel / WHM, just creating accounts and databases, clients do not have FTP access. I'm no sys admin and come from a Windows / GUI background but have some knowledge in setting up development servers. WHM: Creating accounts I presume this sets up the Apache virtual host, FTP access and DNS settings. I've some knowledge of editing the Apache files to create virtual hosts. Am I correct in thinking as long as the DNS is pointing to the server IP and the virtual host is configured the server can serve the (php) pages? I'm not sure I need per site FTP access as only we will have access so I could have a server wide/htdocs only access to view all the site. The company who supply the dedicated hosts would also provide the own DNS management tool so I'm not need to cPanel one. MySQL: Creating users and databases We use cPanel to create the MySQL users and databases. As it's a dedicated box and I can have root access I think this could be replaced by SQLyog for db management and phpMyAdmin for user management. Do you I need cPanel or can I get by editing a few text files for creating the accounts, then use the MySQL tools for databases? Or am I missing something major with how the sites are configured?

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• Are webhosts that require NS instead of a CNAME common?

  - by billpg

  I've just signed up with a webhost (which I prefer not to name) and I'm reasonably happy with it. The only nit was when I was ready to put a site online and I asked the support line to what name I should point my 'www' CNAME to. They responded that they don't do that and I need to set my domain's NS records for the hosting to work. "Why would you ever want to do it that way? Our service to you includes DNS and our servers are probably much better than the one your registrar provides." This was a bit of surprise as all of the other webhosts I've worked with happily support this. I've set up (eg) gallery.myfriend.example for friends by having them configure their DNS to CNAME 'gallery' to the name of a shared server at a webhost and the webhost does name-based hosting for 'gallery.myfriend.example'. (Of course, if the webhost ever tells me I'm being moved from A.webhost.example to B.webhost.example, it would be my responsibility to change where the CNAME points. Really good webhosts would instead create myname.webhost.example for the IP of whichever server my stuff happens to be on, so I'd never have to worry about keeping my CNAME up to date.) Is my impression correct, that most webhosts will happily support a service that begins with a CNAME hosted elsewhere, or is it really more common that webhosts will only provide a service if they control the DNS service too?

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• How far should one take e-mail address validation?

  - by Mike Tomasello

  I'm wondering how far people should take the validation of e-mail address. My field is primarily web-development, but this applies anywhere. I've seen a few approaches: simply checking if there is an "@" present, which is dead simply but of course not that reliable. a more complex regex test for standard e-mail formats a full regex against RFC 2822 - the problem with this is that often an e-mail address might be valid but it is probably not what the user meant DNS validation SMTP validation As many people might know (but many don't), e-mail addresses can have a lot of strange variation that most people don't usually consider (see RFC 2822 3.4.1), but you have to think about the goals of your validation: are you simply trying to ensure that an e-mail address can be sent to an address, or that it is what the user probably meant to put in (which is unlikely in a lot of the more obscure cases of otherwise 'valid' addresses). An option I've considered is simply giving a warning with a more esoteric address but still allowing the request to go through, but this does add more complexity to a form and most users are likely to be confused. While DNS validation / SMTP validation seem like no-brainers, I foresee problems where the DNS server/SMTP server is temporarily down and a user is unable to register somewhere, or the user's SMTP server doesn't support the required features. How might some experienced developers out here handle this? Are there any other approaches than the ones I've listed? Edit: I completely forgot the most obvious of all, sending a confirmation e-mail! Thanks to answerers for pointing that one out. Yes, this one is pretty foolproof, but it does require extra hassle on the part of everyone involved. The user has to fetch some e-mail, and the developer needs to remember user data before they're even confirmed as valid.

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• Open Source Highlight: namebench

  - by eddraper

  DNS is a big deal.  Even small incremental changes to improve its performance can yield significant value due to the vast quantity of look-ups required when using the internet.  Until now, It’s always been one of those things I had to kinda take on faith… was my ISP doing a good job?  Are those public DNS server really that much faster?  What about security and privacy concerns? Let me introduce you to namebench.  This is the kinda tool I really love – one that immediately delivers value and is almost over-the-top OCD in its attention to detail. Trust me, this tool is utterly ruthless in it’s quest for getting it right – you’re not left with a big question mark after it presents its data.  The results are conclusive and actionable.  Here’s what is does: It hunts down the fastest DNS servers from your desktop that it can find using thousands of requests.  No, it doesn’t pop up this little dialog in 10 seconds to give you some “off the cuff” answer from a handful of providers.  It takes the better part of 10-15 minutes to run.  When it finishes, it presents you with a veritable horn-o-plenty of data.  Mean response duration, response distribution, bad data,  no stone is left un-turned. Check it out.  You’ll dig it.

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• Problem in domain name of site in google search [on hold]

  - by Jayadratha Mondal

  My domain provider dont supports advanced DNS at this moment. So I have used iframe to forward to my webserver. Suppose my domain abc.com have a simple html which is opening xyz.com via Iframe. Google was showing abc.com on the search. But from last two days it is showing xyz.com, other things like description, name of the site are ok only the domain changed to xyz.com, but I want to show abc.com. When I'm typing the full domain then google showing the domain as I want. But If I type a part or any keyword then it showing that xyz.com. Anyone have any idea how to show abc.com again? EDIT: I dont know the domain name provider because its not mine. When I'm trying to set new A record its showing that "you need advanced dns to do this currently you are using simple DNS". I'm doing this from cpanel. Normally as per I know there are 3 sections. 1 domain name 2 A record 3Cname. But I dont have any domain name section.

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• arp -n responds with (incomplete) on the wrong subnet, can't remove it

  - by Hannes

  context There are 2 servers: server1 - eth0 10.129.76.16 eth0.2 192.168.0.103 server2 - eth0 10.129.79.1 eth0.2 192.168.62.101 The 192.x.x.x addresses are connected to the same vlan (vlan2) and are able to see eachother. The 10.x.x.x addresses are connected to different vlan's which are not able to see eachother. on request of David Swartz: the routing table on server 1 is: ~$ sudo route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.129.76.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.0.0 0.0.0.0 255.255.192.0 U 0 0 0 eth0.2 0.0.0.0 192.168.61.254 0.0.0.0 UG 100 0 0 eth0.2 the routing table on server 2 is: ~$ sudo route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 <public IP gw> 0.0.0.0 UG 100 0 0 eth0.11 10.129.79.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 <public IP> 0.0.0.0 255.255.255.128 U 0 0 0 eth0.11 192.168.0.0 0.0.0.0 255.255.192.0 U 0 0 0 eth0.2 Problem: When I ping from server 1 to server 2, it seems no packets are arriving and vice versa. When I check the routes (route -n) I see the default gw uses eth0.2 on both servers. But when I use arping, I get a response one way (from server 2 to server 1) but no response vice versa. arping 192.168.62.101 ARPING 192.168.62.101 from 10.129.76.16 eth0 ^CSent 2 probes (2 broadcast(s)) Received 0 response(s) As you can see it uses the 10.x.x.x address instead of the 192.x.x.x. And as I told before, the 10.x.x.x address is unreachable from the other server. When I force arping to use eth0.2, it does work. I don't have any problems with ping'ing other servers from any of those 2 servers. I did see this in the arp tables: ~# arp -n | grep 192.168.0.103 192.168.0.103 (incomplete) eth0 and ~# arp -n | grep 192.168.62.101 Question quite obvious... How can I make these servers see each other again? Things I've tied clear the apropriate entries in the arptable and tried to get rid of the (incomplete) But I think the biggest problem is that eth0 is used instead of eth0.2 for the packets from server 1 to server 2 Because of David Swartz' remark about the routing tables, I added a route in there defining the host. I added 192.168.0.103 0.0.0.0 255.255.255.255 UH 0 0 0 eth0.2 and 192.168.62.101 0.0.0.0 255.255.255.255 UH 0 0 0 eth0.2 to the appropriate servers but this didn't solve the problem so I presume the problem is not in the routing. My guess I guess the problem lies in the following. ~$ arp -n | grep 192.168.0.103 192.168.0.103 (incomplete) eth0 but I'm unable to remove this entry. (arp -d 192.168.0.103 has no effect) Thanks for reading and even more thanks for answering!

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• DHCP settings out of range Internet shuts off after a few minutes

  - by user263115

  I recently upgraded from windows eight to windows 8.1 I do not know if this has anything to do with anything I have a 64 bit OS. My Internet goes off by itself every 5 minutes even though my wireless icon at the lower right of the screen still shows connected I had an error message in the last event in it said that might DHCP settings were out of range. I get my internet at my house through a wireless portable hotspot through my smart phone. But i haven't ever had any problems before and i only have this problem on this network. If i turn airplane mode on and reset my network card, the internet will come back to life but soon die. i don't experience this problem while on a different network or if i'm on WiFi. This s really annoying please help Windows IP Configuration Host Name . . . . . . . . . . . . : NastyMcnastyJr Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Local Area Connection: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : TeamViewer VPN Adapter Physical Address. . . . . . . . . : 00-FF-5D-13-26-21 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Wireless LAN adapter Local Area Connection* 11: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter Physical Address. . . . . . . . . : F6-B7-E2-50-09-38 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Wireless LAN adapter SAMMY McNASTY: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter Physical Address. . . . . . . . . : F4-B7-E2-50-09-38 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::3107:66bc:cf1f:c776%4(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.43.3(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Friday, November 1, 2013 9:50:20 PM Lease Expires . . . . . . . . . . : Saturday, November 2, 2013 12:56:46 AM Default Gateway . . . . . . . . . : 192.168.43.1 DHCP Server . . . . . . . . . . . : 192.168.43.1 DHCPv6 IAID . . . . . . . . . . . : 83146722 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-F1-98-B4-20-89-84-84-61-BB DNS Servers . . . . . . . . . . . : 192.168.43.1 NetBIOS over Tcpip. . . . . . . . : Enabled Ethernet adapter Ethernet: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet Physical Address. . . . . . . . . : 20-89-84-84-61-BB DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Log Name: System Source: Microsoft-Windows-UserPnp Date: 10/26/2013 7:52:23 PM Event ID: 20003 Task Category: (7005) Level: Information Keywords: User: SYSTEM Computer: NastyMcnastyJr Description: Driver Management has concluded the process to add Service vwifibus for Device Instance ID PCI\VEN_14E4&DEV_4727&SUBSYS_E042105B&REV_01\4&3265ADAB&0&00E1 with the following status: 0. Event Xml: 20003 0 4 7005 0 0x8000000000000000 5118 System NastyMcnastyJr vwifibus \SystemRoot\system32\DRIVERS\vwifibus.sys PCI\VEN_14E4&DEV_4727&SUBSYS_E042105B&REV_01\4&3265ADAB&0&00E1 false true 0 Log Name: System Source: Microsoft-Windows-UserPnp Date: 10/19/2013 3:29:12 PM Event ID: 20001 Task Category: (7005) Level: Information Keywords: User: SYSTEM Computer: NastyMcnastyJr Description: Driver Management concluded the process to install driver netbc64.inf_amd64_0df63b5297d0f820\netbc64.inf for Device Instance ID PCI\VEN_14E4&DEV_4727&SUBSYS_E042105B&REV_01\4&3265ADAB&0&00E1 with the following status: 0x0. Event Xml: 20001 0 4 7005 0 0x8000000000000000 2015 System NastyMcnastyJr netbc64.inf_amd64_0df63b5297d0f820\netbc64.inf 6.30.223.102 Microsoft PCI\VEN_14E4&DEV_4727&SUBSYS_E042105B&REV_01\4&3265ADAB&0&00E1 {4D36E972-E325-11CE-BFC1-08002BE10318} false false false 0x0 Broadcom 802.11n Network Adapter Log Name: System Source: Microsoft-Windows-DNS-Client Date: 11/2/2013 12:24:59 AM Event ID: 1014 Task Category: (1014) Level: Warning Keywords: (268435456) User: NETWORK SERVICE Computer: NastyMcnastyJr Description: Name resolution for the name www.google.com timed out after none of the configured DNS servers responded. Event Xml: 1014 0 3 1014 0 0x4000000010000000 34771 System NastyMcnastyJr www.google.com 128 02000000C0A82B01000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

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