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• Migrateing to Windows Server 2008 R2 Domain Controllers - a few Questions/Issues

  - by Chris

  Ok so here's our setup: We have 2 Windows2k3 Domain Controllers. I am trying to replace them with Windows 2008 R2. The Win2k3 servers are DC01 and DC02. The Windows2k8 servers are DC1 and DC2. I prepared the Windows Server 2003 Forest Schema for a Domain Controller That Runs Windows Server 2008 or Windows Server 2008 R2. Then with both of the new servers up as member servers I dcpromo'd DC1 using the advanced option and added it successfully to my exisiting domain. Roles are GC, DNS and Active Directory Domain Services.I transferred The PDC, RID pool manager and Infrastructure master FSMO to the new DC.(DC1) The Schema master and Domain naming master are still on the old DC (DC01). The first issue I'm encountering is when i dcpromo the second DC (DC2) and select "Replicate data over the network from and existing domain controller" I select the new DC to replicate from (DC1) I get the following error: "Failed to identify the requested replica partner (dc1.xxx.org) as a valid domain controller with a machine account for (DC2$). This is likely due to either the machine account not being replicated to this domain controller because of replication latency or the domain controller not advertising the Active Directory Domain Services. Please consider retrying the operation with \dc01.xxx.org as the replica partner. "The server is unwilling to process the request." Is this because the Schema master and Domain naming master roles are still on the old DC (DC01)? And if so, if I transfer Schema master and Domain naming master roles to DC1 what is the risk or breaking my AD? I'm a little paranoid because this process HAS to be transparent. ANY down time or interruption will result in me getting a verbal ass kicking from my I.T. Director. Both of the new servers DNS point the the old DNS servers (DC01 and DC02) not themselves by the way. Thanks in Advance -Chris

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• how to define service runlevel order position?

  - by DmitrySemenov

  I setup bind-dlz and need mysql start prior NAMED when system starts here is what I have [root@semenov]# ./test.sh mysql 0:off 1:off 2:on 3:on 4:on 5:on 6:off named 0:off 1:off 2:off 3:on 4:on 5:on 6:off lrwxrwxrwx. 1 root root 15 Apr 15 18:57 /etc/rc3.d/S93mysql -> ../init.d/mysql lrwxrwxrwx. 1 root root 15 Apr 15 18:57 /etc/rc3.d/S90named -> ../init.d/named here is what I have in mysql init script # Comments to support chkconfig on RedHat Linux # chkconfig: 2345 84 16 # description: A very fast and reliable SQL database engine. # Comments to support LSB init script conventions ### BEGIN INIT INFO # Provides: mysql # Required-Start: $local_fs $network $remote_fs # Should-Start: ypbind nscd ldap ntpd xntpd # Required-Stop: $local_fs $network $remote_fs # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: start and stop MySQL # Description: MySQL is a very fast and reliable SQL database engine. ### END INIT INFO so when I remove named from chkconfig and have there just mysql, it starts with order number 84: /etc/rc3.d/S84mysql - ../init.d/mysql but when I add named inside chkconfig it's order changes to 93: /etc/rc3.d/S93mysql - ../init.d/mysql as a result mysql will be starting after named and named will fail (no sql available) any ideas what I'm doing wrong? here is what I have in named init script # chkconfig: 345 90 16 # description: named (BIND) is a Domain Name Server (DNS) \ # that is used to resolve host names to IP addresses. # probe: true ### BEGIN INIT INFO # Provides: $named # Required-Start: $local_fs $network $syslog # Required-Stop: $local_fs $network $syslog # Default-Start:2 3 4 # Default-Stop: 0 1 2 3 4 5 6 # Short-Description: start|stop|status|restart|try-restart|reload|force-reload DNS server # Description: control ISC BIND implementation of DNS server ### END INIT INFO thanks, Dmitry

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• Using proxy.pac to access Apache 2 with a hostname?

  - by leeand00

  Note that I do not have a DNS on my network, and that is why I am resorting to using a proxy.pac file. I would like to be able to access my development Apache 2 server using a name instead of an ip without setting up a full blown DNS. I am aware of setting names in the C:\Windows\System32\drivers\etc\hosts file and the /etc/hosts files, however I cannot edit the hosts file on all of the devices that I am testing the site on. I've added a proxy.pac file to my Apache2 server and pointed my browsers settings to it at: http://192.168.2.221/proxyutils/proxy.pac ...where 192.168.2.221 is thehostname's ip address. I set the above URL in Firefox in the following manner: From the menubar selecting "Edit-Preferences" In the resulting "Firefox Preferences" window clicking the "Advanced" tab. Clicking the "Network" tab Clicking the "Settings" button. Selecting the "Automatic proxy configuration URL:" radio button. Entering http://192.168.2.221/proxyutils/proxy.pac and pressing OK. The contents of the proxy.pac file on the Apache server function FindProxyForURL(url, host) { if( dnsDomainIs(host, "thehostname") ) return "PROXY 192.168.2.221:80"; return "DIRECT"; } In Firefox I then access the following URL: http://thehostname/wp-blog/ And instead of the development version of the Wordpress blog I am trying to access I get a URL of http://thehostnamehttp/thehostname/wp-blog/ in my address bar and a 404 Not Found page in the browser window. Looking over proxy.pac, it seems like calling dnsDomainIs shouldn't work considering I don't have a DNS setup on my network, but I've also tried just comparing the host argument with the string "hostname" and it yielded the same result, even after modifying the proxy.pac file and clicking the reload button near the proxy settings. This could also be a Wordpress problem, since I've noticed that directories without Wordpress seem to function perfectly normally. (see cross post here) Is there any way I can modify my configuration so that I can access the site using http://thehostname/wp-blog/ ?

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• Need help using a super scope

  - by Vdub

  I have a windows server 2008 r2 standard running our DCHP, DNS, and AD. also I have (3) HP Pro Curve 2510-G switches (J9280A). Right now our LAN is set up 192.168.50.2-192.168.50.254 on our sub-net (A) and another scope with 192.168.51.2-192.168.51.254 sub-net (B) both have sub-net mask of 255.255.255.0. The same server is our DNS which is 192.168.50.242 and our firewall (watchguard) is the gateway at 192.168.50.1. Right now the sub-net (B) does not have DHCP active so only sub-net (A) is giving a pool. My problem is that we are trying to have open WiFi on our network and i am assuming that i can use the sub-net (B) for that if i activate it and use sub-net (A) for our staff only. I have noticed that when i set up a static on a client pc and set it to 192.168.51.x i cannot use the DNS of 192.168.50.242 however i can use 8.8.8.8 and it works fine, i am guessing that because it is on a different sub-net? Forgive me as i am very new at this and dont know a lot. Is there easy way with the equipment i have to a accommodate wifi for hundreds of people without causing problems for our staff? (multiple same IP address assigns) I appreciate any and all info!

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• Intermittent 5.7.1 email bounce to Exchange 2007

  - by Steve Kennaird

  My knowledge of Exchange isn't particularly great, so excuse me if some of the terminology I use isn't quite right. I'm primarily a web developer who's now responsible for a small business's network. We have a server running SBS 2008 and Exchange 2007. Generally, everything works well, emails are able to be sent to both internal and external domains without issue. We've only got ~20 users, Exchange is sitting on a single server. I use SendGrid to send emails generated by our externally hosted website to users in the office. Primarily, order notifications are sent to [email protected]. Without any pattern and less than once per week on average, an email to [email protected] will bounce back, and the logs on SendGrid detail the following error: 550 5.7.1 Unable to relay for [email protected] Either side of that failed delivery attempt, I'm able to send and receive emails to/from [email protected]. Having done some research, incorrect reverse DNS seems like it could be a cause of intermittent bounces like this. Having used nslookup, I have found that the reverse DNS doesn't map like it should, e.g. Office IP: 135.325.351.123 (made up IP, for example only) Domain: office.somedomain.com (made up, for example only) Reverse DNS: somedomain.gotadsl.co.uk (half made up) Could this be a cause? I'm sure that the IP address and the domain should map to each other. Also, it has been suggested to me that as the Exchange server is on a network with an ADSL connection, that could be a potential cause as the connection "goes up and down all day long". I don't have an opinion on this, as I don't have enough knowledge of Exchange/ADSL to form a reliable opinion. Can anyone offer any insight as to whether one or both are actually potential causes, or if there is another possible cause?

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• Migrating to Windows Server 2008 R2 Domain Controllers - a few Questions/Issues

  - by Chris

  Ok so here's our setup: We have 2 Windows 2003 Domain Controllers. I am trying to replace them with Windows 2008 R2. The 2003 servers are named DC01 and DC02. The 2008 R2 servers are DC1 and DC2. I prepared the Windows Server 2003 Forest Schema for a Domain Controller that runs Windows Server 2008 or Windows Server 2008 R2. Then with both of the new servers up as member servers I ran dcpromo on DC1 using the advanced option and added it successfully to my existing domain. It's roles are GC, DNS and Active Directory Domain Services. I transferred The PDC Emulator, RID Pool Manager, and Infrastructure Master roles to DC1. The Schema Master and Domain Naming master are still on DC01. The first issue that I'm encountering is when I dcpromo the DC2 and select "Replicate data over the network from and existing domain controller" I select that I want to replicate from DC1 and I get the following error: Failed to identify the requested replica partner (dc1.xxx.org) as a valid domain controller with a machine account for (DC2$). This is likely due to either the machine account not being replicated to this domain controller because of replication latency or the domain controller not advertising the Active Directory Domain Services. Please consider retrying the operation with \dc01.xxx.org as the replica partner. "The server is unwilling to process the request. Is this because the Schema Master and Domain Naming Master roles are still on the old DC01? And if so, if I transfer Schema Master and Domain Naming Master roles to DC1 what is the risk or breaking my AD? I'm a little paranoid because this process HAS to be transparent. ANY down time or interruption will result in me getting a verbal ass kicking from my I.T. Director. Both of the new servers DNS point the the old DNS servers (DC01 and DC02) not themselves by the way.

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• w2k3 AD DC Demotion fails with "no other AD DC for that domain can be contacted"

  - by Kstro21

  i've a small office with a single w2k3 sp2 DC(bad idea, but it is real), now, i want to make a clean install of that pc, so, i got another one, install w2k3 sp2, add it to the domain, dcpromo and set it to be a GC, untill now everything is ok, then tried to dcpromo in the primary DC, but it fails with The box indicating that this domain controller is the last controller for the domain mydomain.com is unchecked. However, no other Active Directory domain controllers for that domain can be contacted. Do you wish to proceed anyway? If you click Yes, any Active Directory changes that have been made on this domain controller will be lost. So, i started to move all the roles to the new server as described here, when all was ok with the roles, i tried doing the same, but got the same result. Tried moving the DNS to the new server, but it doesn't make difference. Shutdown to the old server, then tried to log into a workstation, but it fails saying the domain is not available, also coudln't add new workstation to the domain, so i have to power on the old server again. So, if i successfully move all the roles and dns to the new server: why dcpromo give such message in the old server? why if i shutdown the old server the domain is not available?? if i successfully move all the roles and dns to the new server, and i click yes when dcpromo give warning in the old server, will i lose all users, computers, ou, etc.? am i missing some steps to make this work?? hope you can help me thanks

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• Barriers to IPv6 deployment: addressing

  - by sysadmin1138

  There are several things that are keeping IPv6 deployment from being a topic of active discussion here at my work. There are the usual technical issues, but one non-technical one appears to be a major stumbling block on the path to actually getting a deployment project going. Addresses, memorizing of. Specifically, IPv4 addresses are comprehensible, and IPv6 addresses just look like a big long string of hex. The human mind has real trouble memorizing lists of more than 7-8 items, and an IPv4 address (192.168.231.148) has four items in it which makes it easy for us to memorize. A fully populated IPv6 address has not only 8 sections, but each section has 4 hex digits in it. IPv6 addresses were not designed for memorization. To the technician who knows that the DNS server is at 192.168.42.42 (or more likely "42.42", since the company prefix is likely memorized), the idea of memorizing an IPv6 address fills them with dread. Which in turn makes them much less enthusiastic about participating in an IPv6 deployment project. Because of how our network works we're not fully dynamic in terms of v4 addressing. We have several to many subnets that are entirely statically assigned for a variety of reasons, chief among them being that the overhead of static DHCP assignments is perceived as being too great. Also, some devices still aren't smart enough to pull DNS addresses out of DHCP while also having a static assignment, and therefore require manually configured DNS settings. Therefore, some v6 address memorization will have to be done. We're not under any mandate to get v6 out the door, so we don't have pressure from the top. However, it is time to start prepping our infrastructure to handle IPv6 even if we don't convert wholesale. For those of you who have been in IPv6-land for a while, what short-cut methods do you use to discuss or keep track of subnets and specific/critical IP addresses? If I can help reduce some of the dread surrounding IPv6 we might get the project going.

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• how to setup a bridge with 2 NICs and few virtual machines

  - by Bond

  Here is my situation. I have a server with 2 NICs. I have installed virtual box and I have created a few Guest Operating Systems on it. I want these Virtual Machines to be using a bridge.NIC2 would be used to setup this bridge and NIC1 would be connected to corporate network.I am not clear with how should I go on doing this. /etc/network/interfaces is the file which I am trying to modify etc. My approach is following 1) Define a configuration file /etc/network/interfaces 2) Create IPTABLES as how NIC1 will forward the packets to Bridge on NIC2 Now comes the problem I do not understand what is the meaning of following lines in the configuration file auto lo iface lo inet loopback # The primary network interface auto eth2 iface eth2 inet manual auto br0 iface br0 inet static address 192.168.1.14 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.10 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers 192.168.13.2 dns-search myserver.net bridge_ports eth2 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off So any pointers to what should be the entries of /etc/network/interfaces file. So that I understand which parameter is to be used when and where that would help me.

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• Wake on Demand for Apache server in OS X 10.8

  - by Gary

  Mac OS X Mountain Lion does not have a Web Sharing box in the Sharing system prefs menu. It is thoroughly discussed on the web that the Apache server is available, and that it can be turned on manually in the command line, or by using a convenient Prefs Pane. That works while the computer is awake. But, when my computer goes to sleep, the server stops working, even though Wake for Network Access is checked in the Energy Saver Pref Pane. From the discussion on Bonjour, I see that this problem probably results from the fact that Apache isn't registered with Bonjour. Does that sound likely? If not, please make some suggestions. The connection is via hard-wired ethernet. If registration with Bonjour is the problem, I'd like to know how to register it. You gave a nice description of dns-sd, and the command description says dns-sd -R Name Type Domain Port [TXT...] (Register a service)", but I don't know what to use for "Name" or "Type", or the format of the domain. I tried some dns-sd -B searches and found nothing I could use as a model, and it doesn't show up in Bonjour Browser. Any suggestions would be appreciated.

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• Adding 2nd DC to the domain from a different subnet over VPN.

  - by EagerToLearn

  I'm in the process of adding a second DC to our domain and just want to make sure I have all the steps right before proceeding. Info: DC1 is 2008 R2 Standard. DC2 is 2008 R2 Standard. Network1 is 192.168.39.x/24 Network2 is 10.0.0.x/24 VPN is Sonicwall. The 2 DC's will be at two different sites, but the networks are connected by hardware VPN. (Sonicwall). The main DC server will be on the 192.168.39.0/24 network. The 2nd DC will be on 10.0.0.0/24. Here are the steps I plan to take; please let me know if I'm missing anything. Part 1: AD Sites and Services on DC1, create a new site and subnet for DC2. (Or should I create a new one for both?) (Can I use the default IPSiteLink and not change anything in there other than refresh timer?) Part 2: Point the DNS of DC2 to DC1. Run /forestprep and /domainprep (on both, or just DC1?). Dcpromo and select "Additional Domain Controller for Existing Domain". Then continue with normal steps with default locations for databases. EDIT: Didn't realize this was like reddit and required two skipped lines to skip one :P EDIT 2: When DCPromo-ing DC2, do I need to have "Append primary and connection specific DNS" and "Append parent suffixes of the primary DNS suffix" checked?

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• RTNETLINK answers: File exists... maybe because assigned a new mac adress

  - by steven

  I got a "RTNETLINK answers: File exists Failed to bring up eth0:1" on "ifup eth0:1". I suspect it happens because i assigned a new mac adress in my VM's network adapter. Can you tell me how to fix the issue? My configuration looks like this: # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.1.80 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 192.168.1.1 # Alias being connected to 192.168.10.x Network auto eth0:1 allow-hotplug eth0:1 iface eth0:1 inet static address 192.168.10.83 netmask 255.255.255.0 gateway 192.168.10.10 dns-nameservers 192.168.10.1 Why do I get "RTNETLINK answer: File exists.." suddenly? I worked with this configuration before without problems. All i did in the past is to renew the adapters mac adress. At the moment I am connected to the 192.168.10.x Network and if I do /etc/init.d/networking stop /etc/init.d/networking start then i got "RTNETLINK [...] falied to bring up eth0:1" but the strage thing is that i am able to connect to 192.168.10.83 via ssh from my host machine. But I cannot reach the internet from the debian client. I hope it is clear what my problem is, now. update if i change my /etc/network/interfaces like this then "ifup eth0" fails, too with the same error! # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.10.83 netmask 255.255.255.0 gateway 192.168.10.10 dns-nameservers 192.168.10.1 with verbose option enabled i got: Configuring interfache eth0=eth0 (inet) run-parts --verbose /etc/network/if-pre-up.d ip addr add 192.168.10.83/255.255.255.0 broadcast 192.168.10.255 dev eth0 label eth0 RTNETLINK answers: File exists Failed to bring up eth0. same if i type this manually: ip addr add 192.168.10.83/255.255.255.0 broadcast 192.168.10.255 dev eth0 label eth0

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• Emails not sending from outlook / OWA - Not even hitting the mail queue in exchange

  - by webnoob

  We are having an issue this morning where we can receive external emails but cannot send internal or external ones from Outlook or OWA. If I use: Send-MailMessage –From <[email protected]> –To <[email protected]> –Subject “Test #01”-Body “Just a test message.” –SMTPServer <Server-Name> –Credential <domain\user> the email is sent correctly which makes me think there is a connection issue with OWA and Outlook. However, outlook is reporting as Connected with exchange. I have checked the message tracking in exchange tools and emails sent via outlook and OWA do not appear. Nothing has changed on the server on the weekend so I don't really know where to start debugging this issue. We are using Windows SBS 2011. We only have one send connector which isn't using Smart Hosts and is set to use DNS MX records. Use external DNS is not checked and I can ping google.com etc so doesn't appear to be a DNS issue (plus the email sends from the console anyway). EDIT It appears that users using IMAP can send emails correctly, its only ones that rely on the normal exchange connection type that don't work. EDIT Emails from IMAP are hitting the email queue's where as emails from the normal exchange accounts aren't. EDIT It seems that some of the emails we tried to send yesterday sent at about 1am but now it won't work again..

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• openvpn port 53 bypasses allows restrictions ( find similar ports)

  - by user181216

  scenario of wifi : i'm using wifi in hostel which having cyberoam firewall and all the computer which uses that access point. that access point have following configuration default gateway : 192.168.100.1 primary dns server : 192.168.100.1 here, when i try to open a website the cyberoam firewall redirects the page to a login page (with correct login information, we can browse internet else not), and also website access and bandwidth limitations. once i've heard about pd-proxy which finds open port and tunnels through a port ( usually udp 53). using pd-proxy with UDP 53 port, i can browse internet without login, even bandwidth limit is bypassed !!! and another software called openvpn with connecting openvpn server through udp port 53 i can browse internet without even login into the cyberoam. both of softwares uses port 53, specially openvpn with port 53, now i've a VPS server in which i can install openvpn server and connect through the VPS server to browse internet. i know why that is happening because with pinging on some website(eb. google.com) it returns it's ip address that means it allows dns queries without login. but the problem is there is already DNS service is running on the VPS server on port 53. and i can only use 53 port to bypass the limitations as i think. and i can not run openvpn service on my VPS server on port 53. so how to scan the wifi for vulnerable ports like 53 so that i can figure out the magic port and start a openvpn service on VPS on the same port. ( i want to scan similar vulnerable ports like 53 on cyberoam in which the traffic can be tunneled, not want to scan services running on ports). improvement of the question with retags and edits are always welcomed... NOTE : all these are for Educational purpose only, i'm curious about network related knowledge.....

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• openvpn port 53 bypasses allows restrictions ( find similar ports)

  - by user181216

  scenario of wifi : i'm using wifi in hostel which having cyberoam firewall and all the computer which uses that access point. that access point have following configuration default gateway : 192.168.100.1 primary dns server : 192.168.100.1 here, when i try to open a website the cyberoam firewall redirects the page to a login page (with correct login information, we can browse internet else not), and also website access and bandwidth limitations. once i've heard about pd-proxy which finds open port and tunnels through a port ( usually udp 53). using pd-proxy with UDP 53 port, i can browse internet without login, even bandwidth limit is bypassed !!! and another software called openvpn with connecting openvpn server through udp port 53 i can browse internet without even login into the cyberoam. both of softwares uses port 53, specially openvpn with port 53, now i've a VPS server in which i can install openvpn server and connect through the VPS server to browse internet. i know why that is happening because with pinging on some website(eb. google.com) it returns it's ip address that means it allows dns queries without login. but the problem is there is already DNS service is running on the VPS server on port 53. and i can only use 53 port to bypass the limitations as i think. and i can not run openvpn service on my VPS server on port 53. so how to scan the wifi for vulnerable ports like 53 so that i can figure out the magic port and start a openvpn service on VPS on the same port. ( i want to scan similar vulnerable ports like 53 on cyberoam in which the traffic can be tunneled, not want to scan services running on ports). improvement of the question with retags and edits are always welcomed... NOTE : all these are for Educational purpose only, i'm curious about network related knowledge.....

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• network routing between mac & virtual XP

  - by Kevin

  Hi - I have a max laptop running XP inside VirtualBox. The network is setup to be a "Bridged Adapter" so that the IPs for both the host & guest OS's are assigned by my wireless routed. My guest XP has Nortel VPN connecting to corporate lan. When this is connected, I want to allow my host Mac OS to access the corporate network. But I'm struggling. Without Nortel VPN running, I can change routing on the mac so all traffic is sent via the guest XP - this works. But once I activate the VPN, this no longer works. If I try to change the routing on mac to run through the IP address assigned to the Nortel adapter, I get a "Network is unreachable" error. Below is the output from ipconfig /all on the guest XP OS. I'm beginning to believe that what I want to do is not possible because of the way Nortel secure the VPN - but before I give up I thought I'd post the problem here. Thanks, Kevin z:\eclipseworkspace\RESMobileSuite\trunk>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : zzzz-3177b42dd0 Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : Yes WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : zzzz.zzz Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : AMD PCNET Family PCI Ethernet Adapter Physical Address. . . . . . . . . : 08-00-XX-XX-XX-XX Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.1.3 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DNS Servers . . . . . . . . . . . : 192.168.1.1 Lease Obtained. . . . . . . . . . : 30 April 2010 12:22:02 Lease Expires . . . . . . . . . . : 01 May 2010 12:22:02 Ethernet adapter {8EB7A442-9683-45FB-A602-56110A4B3434}: Connection-specific DNS Suffix . : zzzz.zz Description . . . . . . . . . . . : Nortel IPSECSHM Adapter - Packet Scheduler Miniport Physical Address. . . . . . . . . : 44-45-YY-YY-YY-YY Dhcp Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : XXX.4.52.62 Subnet Mask . . . . . . . . . . . : 255.255.254.0 Default Gateway . . . . . . . . . : XXX.4.52.62 DNS Servers . . . . . . . . . . . : XXX.6.21.36 XXX.6.21.100

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• Easiest way to allow direct HTTPS connection in Intercept mode?

  - by Nicolo

  I know the SSL issue has been beaten to death I'm using DNS redirect to force my clients to use my intercept proxy. As we all know, intercepting HTTPS connection is not possible unless I provide a fake certificate. What I want to achieve here is to allow all HTTPS requests connect directly to the source server, thus bypassing Squid: HTTP connection Proxy by Squid HTTPS connection Bypass Squid and connect directly I spent the past few days goolging and trying different methods but none worked so far. I read about SSL tunneling using the CONNECT method but couldn't find any more information on it. I tried a similar method in using RINETD to forward all traffic going through port 443 of my Squid back to the original IP of www.pandora.com. Unfortunately, I did not realize all other HTTPS requests are also forwarded to the IP of www.pandora.com. For example, https://www.gmail.com also takes me to https://www.pandora.com Since I'm running the Intercept mode, the forwarding needs to be dynamic and match each HTTPS domain name with proper original IP. Can this be done in Squid or iptables? Lastly, I'm directing traffic to my Squid server using DNS zone redirect. For example, a client requests www.google.com, my DNS server directs that request to my Squid IP, then my transparent Squid will proxy that request. Will this set up affect what I'm trying to achieve? I tried many methods but couldn't get it to work. Any takes on how to do this?

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• How to connect AD Explorer from Sysinternals to Global Catalog

  - by Oliver

  I'm using the sysinternals AD Explorer quite frequently to search and inspect an Active Directory without any big problems. But now i'd like to connect not only to a single AD Server. Instead i like to inspect the global catalog. If i enter within the AD Explorer connect dialog only the dns name of the machine (e.g. dns.to.domain.controller) that is serving the global catalog i only receive the concrete domain for which it is responsible, but not the whole forest (that's normal behaviour and expected by me). If i'm going to add the default port number (3268) for the global catalog in the form dns.to.domain.controller:3268 AD Explorer will simply crash without any further message. The global catalog itself works as expected under the given name and port number, cause our apache server use exactly this address and port number to authenticate some users. So any hints or tips to access the global catalog out of AD Explorer? Or there are any other nice tools like AD Explorer out there that doesn't have any problems to access the global catalog?

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• postfix test and configuration problem

  - by Woho87

  Hi Guys! I installed postfix using sudo yum install postfix postfix-mysql. I'm newbie to mail systems, but I have one AMAZON EC2 instance with a public DNS. I used the public DNS in most cases, when I configured the file main.cf. The public DNS I have is from amazon and it is a long string(ec2-123-34-234-677.....amazon.com). // I configured this on main.cf. I replaced example.com with ec2-123-.......amazon.com myhostname = mail.example.com mydomain = example.com myorigin = $mydomain mydestination = example.com, $transport_maps local_recipient_maps = $alias_maps $virtual_mailbox_maps unix:passwd.byname home_mailbox = Maildir/ How do I test postfix? I just want it to send emails for my web application. I tried to test it with >telnet localhost 25 after I typed in SSH >sudo postfix start. but I recieve the message that telnet command can not be found. I also use the Amazon linux distribution if you want to know. I use it because it is free. What have I done wrong? Are there anymore configurations required pls help!

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• Certain websites redirect to 127.0.0.1. How do I fix this?

  - by Dian

  Facebook and Youtube in particular. Tried nslookup the address shows as 127.0.0.1. Checked the HOSTS file, it's fine. Ran Malwarebytes' Anti-Malware (didn't find any problems) and SpyBot Search and Destroy (found 1 problem). (Not sure if the Spybot made this improvement) now pinging youtube shows the correct address (74.125.71.91) but the browser still says: Connection to 127.0.0.1 Failed The system returned: (111) Connection refused Tried ipconfig /flushdns but there are no changes. Switched to another user but the results are the same. hosts file: # Copyright (c) 1993-2009 Microsoft Corp. # # This is a sample HOSTS file used by Microsoft TCP/IP for Windows. # # This file contains the mappings of IP addresses to host names. Each # entry should be kept on an individual line. The IP address should # be placed in the first column followed by the corresponding host name. # The IP address and the host name should be separated by at least one # space. # # Additionally, comments (such as these) may be inserted on individual # lines or following the machine name denoted by a '#' symbol. # # For example: # # 102.54.94.97 rhino.acme.com # source server # 38.25.63.10 x.acme.com # x client host # localhost name resolution is handled within DNS itself. # 127.0.0.1 localhost # ::1 localhost ipconfig all: Connection-specific DNS Suffix: DNS Servers: 10.1.1.30 208.67.220.220

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• Diagnosing Random Network Lag

  - by uesp

  I'm having trouble diagnosing some random lag on a 6 server LAMP cluster serving a MediaWiki site. While we're serving some 100 pages/sec the servers themselves are running fine with less than 0.5 load, no locked processes, no paging, no errors being logged, etc.... Lag is present on all servers and is random: one minute its fine the next it's there. DNS lookups on the servers are randomly slow. For example time nslookup google.com varies randomly from a few milliseconds to several seconds and sometimes times out entirely. While we use IP addresses internally on the cluster this may be a symptom of the root issue. We are not running our own DNS server. The Apache server-status pages randomly lag or time out. Benchmarking using ab between servers shows a few loads sometimes take 3000 ms (almost exactly). Benchmarking server-status on the local server itself usually shows no issue (it showed a lag only once among a few hundred tests). The servers are sitting behind a switch and a firewall which I don't have any access to so I don't know their setup or status. While we are under heavier than normal load a 2 Mbps incoming and 20 Mbps outgoing traffic shouldn't be stressing the switch or firewall should it? My feeling is that it is the switch/firewall or something above them in the ISP like their DNS but can't confirm it. I need some other tests or methods of diagnosing this lag to try and narrow down the ultimate cause.

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• Can't ping localhost/or reach locally hosted domain

  - by Ian

  I can't reach a locally hosted domain, and in testing I have discovered I can't ping localhost or the actual IP either. OS is Windows7 64bit, Pro. DNS works, I can ping others on my network, they can ping me, and they can reach the hosted domain. The ONLY problem I have found is that I can't reach the locally hosted domains! C:\Users\ianipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : leda Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : hcs Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hcs Description . . . . . . . . . . . : Atheros AR8121/AR8113/AR8114 PCI-E Ethern et Controller Physical Address. . . . . . . . . : 00-23-54-7C-E2-2A DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 192.168.0.12(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.0.1 DNS Servers . . . . . . . . . . . : 192.168.0.1 NetBIOS over Tcpip. . . . . . . . : Enabled Ethernet adapter VirtualBox Host-Only Network #2: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : VirtualBox Host-Only Ethernet Adapter #2 Physical Address. . . . . . . . . : 08-00-27-00-88-4A DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Autoconfiguration IPv4 Address. . : 169.254.205.215(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : NetBIOS over Tcpip. . . . . . . . : Enabled C:\Users\ianping localhost Pinging leda [127.0.0.1] with 32 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. Ping statistics for 127.0.0.1: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), C:\Users\ianping coachmaster.leda.hcs Pinging coachmaster.leda.hcs [192.168.0.12] with 32 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. Ping statistics for 192.168.0.12: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), C:\Users\ian I can reach a hosted VM in VirtualBox and the VM can browse the hosted sites. I've removed Zone Alarm and disabled Windows Firewall - same results. So how can I browse my locally hosted sited? What could be blocking it? Thanks Ian

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• LAN Webserver not accessible through PPTP VPN

  - by Joe

  I have this LAN Network with 10 clients and one server. The server has 4 virtual machines and a BIND DNS Server. When the router assigns an IP through the DHCP , it also gives the ip of the DNS Server, to resolve internal domains. Everything apparently works fine, the clients being able to access the server's vm's resources, but I also have to create the possibility of remote access. I installed the PPTP VPN on the server, and the vpn clients would get the same ip address range as the router's dhcp is assigning. Apparently everything is fine here also, except the fact that when we connect through the vpn , we cannot access the webserver on port 80 ( the webserver being one of the server's VM ). The iptables on the webserver has been turned off for testing purposes and the router's firewall is directing all the external traffic to the server. Can somebody suggest a solution to this? Extra details : VPN Server : PPTP Server Centos 6.3 x64 VPN Client : Windows 7 default PPTP VPN Connection The client is successfully connected to the server, everything works ( FTP/MYSQL/SSH/DNS ) , except the fact that when I try to access the webserver IP on the browser, it won't work.Pinging it works perfectly.

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• Router intermittently failing

  - by nomen

  My old Asus router died a few weeks ago, so I thought I'd set up my Debian box to deal with routing my home network. I have a few complications, but I adapted my configuration from a previously working configuration, and I don't see why I am having intermittent problems. But I am having them! Every so often, my SSH connections to the router (and to the Xen virtual machines hosted by the router) just drop. I am unable to use the router's dns server. I can't ping the router. Etc. All of these things work most of the time, but break down intermittently, for a few minutes at a time. (I can provide more details, but I'm not sure what will be helpful) /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback # Gigabit ethernet, internal network auto eth0 allow-hotplug eth0 iface eth0 inet manual # USB ethernet, internet auto eth1 allow-hotplug eth1 iface eth1 inet dhcp # Xen Bridge auto xlan0 iface xlan0 inet static bridge_ports eth0 address 10.47.94.1 netmask 255.255.255.0 As I understand it, this is sufficient to create the network interfaces, and even do some switching between Xen hosts and my eth0 interface. I installed and configured Shorewall to manage routing between the bridge and my internet-facing interface: /etc/shorewall/zones fw firewall net ipv4 lan ipv4 /etc/shorewall/interfaces net eth1 detect dhcp,tcpflags,nosmurfs,routefilter,logmartians lan xlan0 detect dhcp,tcpflags,nosmurfs,routefilter,logmartians,routeback,bridge /etc/shorewall/policy net all DROP info fw net ACCEPT info all all REJECT info /etc/shorewall/rules DNS(ACCEPT) fw net DNS(ACCEPT) lan fw Ping(ACCEPT) lan fw ... and so on, these all work, when the router is accepting traffic at all. /etc/shorewall/masq eth1 10.47.94.0/24 Also, the router is currently "working", and I checked on a problematic client: arp infrastructure infrastructure.mydomain (10.47.94.1) at 0:23:54:bb:7d:ce on en0 ifscope [ethernet] I tried it when the router was down, and I (eventually) got the same response. It took about 30 seconds to return, though.

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• Setting a subdomain to access home machine with windows remote desktop

  - by ianhales

  I'm trying to remotely connect to home machine through Windows Remote Desktop (amongst other things, but this is currently my primary focus). I can do this fine using my home WAN's static IP (thank god for cable!) with port-forwarding, but I would like to access it from a subdomain of my web-site (e.g. home.mydomain.co.uk). In the cPanel for my hosting account, I've gone into DNS zones and altered the A-record to point to my WAN's IP, which I thought should do the job, but I still cannot connect. When I ping the subdomain, I get my web-host's IP, which I guess is to be expected as I believe the DNS of the host domain is used first, then my server handles the redirection of traffic to the IP in the A-record. Is this the correct idea? Do A-record changes suffer from the same propagation delays as DNS record changes, as I suppose that could explain it? (by the way, this thread confirms my thoughts that setting the A-record should be enough: Hostmonster Subdomain redirected to home server IP: How to ssh into home server using subdomain)

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