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• debian VM refusing all traffic apart from http

  - by james lewis

  I've got a VM with a fresh install of Debian (wheezy) and I've installed node and mongo on it. The VM is using a bridged network connection so I was expecting to be able to point my host machines browser at the ip address of the Debian VM (port 1337 for my node example or port 28017 for my mongo status page) and see one of the two services (node or mongo). My requests are refused though. As far as I can tell Debian allows all traffic by default and you have to manually configure iptables to drop traffic. I've checked iptables and it says it's setup to allow anything through. It looks like this: root@devbox:/home/jlewis# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination As a test I setup nginx and I was able to get to the nginx landing page from my host no problems so obviously http traffic is allowed. I then set nginx up to forward all traffic upstream to mongo - no problems there, I was able to see the status page. I then did the same for my example node server and again, no problems. So http traffic is fine, but all other traffic is blocked. Anyone know why debian might be refusing all other traffic other than iptables being setup to drop it? EDIT - output from netstat -nltp: Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 127.0.0.1:28017 0.0.0.0:* LISTEN 1762/mongod tcp 0 0 0.0.0.0:51028 0.0.0.0:* LISTEN 1541/rpc.statd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2462/sshd tcp 0 0 127.0.0.1:1337 0.0.0.0:* LISTEN 2794/node tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2274/exim4 tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN 1762/mongod tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1510/rpcbind tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 2189/nginx tcp6 0 0 :::22 :::* LISTEN 2462/sshd tcp6 0 0 :::45335 :::* LISTEN 1541/rpc.statd tcp6 0 0 ::1:25 :::* LISTEN 2274/exim4 tcp6 0 0 :::111 :::* LISTEN 1510/rpcbind

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• Directly editing IIS 7 applicationHost.config configuration file

  - by lunadesign

  I know that IIS 7+ now uses XML config files instead of the metabase. I also know that if I edit a web.config file for a given site, IIS automagically detects the changes and implements any corresponding config changes. However, does this also apply to the server-level applicationHost.config settings file? (Its usually located in C:\windows\system32\inetsrv\config.) Specifically, is it safe to carefully edit this file instead of using IIS Manager or the appcmd command line utility? I couldn't find anything in the documentation that said it was okay or not okay to do this. I'm curious because I have to change the bindings for numerous sites from one IP to another. It would be much faster to simply do a global search and replace for the IP address in the config file instead of manually editing a few dozen sites in the GUI.

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• Problems installing LYNC on non-domain controler

  - by Trikks

  I have two servers in this set up. AD and EX, the domain is called mydomain.net The AD is a Windows 2008 Server (32 bit) with Active Directory installed AD only has it's own ip in the DNS-servers list AD.mydomain.net does resolve correctly in the dns EX is a Windows 2008 R2 that is connected to the mydomain.net-domain EX only DNS server is the ip of the ad.mydomain.net There are no firewalls running between the two servers When trying to install Lync 2010 on the EX server I get the following error "Not available :Failure occurred attempting to check the schema state.Please ensure Active Directory is reachable." I can control the AD from EX, also login to it and do successful checks like netdom query /domain:mydomain.net fsmo ...that resolves correctly I suspect there is something fundamentally wrong with my setup, maybe Lync need a 2k8 R2 ad?

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• How do internal smtp servers send mail to internal mail servers on the network?

  - by dmr83457

  We have upgraded our internal corporate email server and the IP address has changed internal to our network. A second email server is used for sending bulk jobs for a mailing list service that we offer. Since the switch of the internal corporate server IP we have been seeing problems when the bulk email server is trying to send email to our own domain. The log shows that it is still trying to hit the old corporate server instead of the new one. I have looked through all settings for the bulk email software and see nothing set there to send to internal mail servers, and I do not recall doing anything special to get this working when setup a couple years ago. Is there a setting in Win2003 or on the network that enables the mapping of MX record external IPs to internal IPs so mail gets routed correctly?

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• How to Track Duplicate Downloads

  - by user1089173

  I have a product and we are running a campaign for it to allow users to download a trial version. My questions is there any way to detect multiple downloads from the same computer but behind a proxy. For example if a person uses a proxy server, changes his/her ip and downloads our trial version multiple times from different Ip's, is there a way to detect that it is the same person who's downloading the s/w. We use only Name and Email addresses to be entered before downloading our s/w and that can easily be created. We cannot add any other fields to the form (like phoneno.)

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• Can't set up printing from Mac OS X (10.5.7) to an HP PSC 2410 shared from PC running Ubuntu 9.10

  - by Weston C

  I've got an HP PSC 2410 printer shared from a fresh Ubuntu 9.10 installation. I'm able to send documents to this printer over the network from another Ubuntu machine. But so far, I haven't been able to find a setup where I can send documents to that printer from a MacBook running 10.5.7. On the Mac side, when setting things up, I go into System Prefs Print & Fax, click on the "+" mark, select "IP", pick "IPP", enter the IP address of the Ubuntu box, leave the queue blank, enter the Name and location, and I think it's when I get to the "Print Using" (driver selection) part that I'm running into issues. If I use "Auto Select", it defaults to "Generic PostScript Printer", which I doubt the PSC 2410 is (and sure enough, if I print, the jobs don't go through). If I try "Select a driver to use...", there's not an option for an HP PSC 2400. This seems a little odd: I can plug the printer directly into one of our Macs and it immediately figures out the driver and I can print no problem, but that's apparently the way things work. So, that leaves one option: "Other", which, when selected, brings up a dialog apparently for the purpose of manually locating a driver. I've tried visiting HP's web site. They have drivers for earlier versions of Mac OS X, but state that after 10.4, Mac OS X should just come with the relevant drivers. I've also tried setting things up by interacting with the CUPS server on the Mac through a browser: I go to http://localhost:631/, select "Add New Printer", pick "Internet Printing Protocol (http)" for the Device selection, enter "http://ubuntu.machine.ip.address:631/printers/hp-psc-2400-series" for the Device URI, select "HP" for Make, and then on the next screen, we're back to the problem where the PSC 2400 just doesn't show up. There's an option to "provide a PPD file", which I assume would be the printer driver I can't find. A Google search for "HP PSC 2410 ppd Leopard" doesn't seem to yield much other than a reminder that the printer is supposed to just work out of the box on Leopard. A local search for ".ppd" or "2410" on either Mac also doesn't yield anything that looks like a relevant print driver. I'm totally stuck at this point. Any advice?

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• Does Dynamic DNS require separate subdomains?

  - by kce

  Hello. I have a functioning DHCP/DNS (ISC Bind 9.6, DHCP 3.1.1) server running on Debian that I would like to add DynamicDNS functionality to. I have a pretty simple question: Does DynamicDNS require (or recommend) separate sub-domains? I have seen a few tutorials where the the clients that are acquiring their IP addresses and other networking information via DHCP are on a different sub-domain as the servers which are statically configured (both in terms of IP, and DNS). For example: All the clients are on ws.example.org and the servers on example.org. Right now all of our servers and clients are in the same domain (example.org) but spread across different zone files (because we have multiple subnets). The clients are configured with DHCP and the servers are configured statically. If I want to setup DynamicDNS for the clients should I use a separate sub-domain? What's the best practice here (and why or why not would it be a bad idea to do otherwise)? Thanks.

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• Reproducible file corruption for files on windows share

  - by bbuser

  We have about 40 file servers in our intranet to distribute software packages. The servers have names like example01, example02 etc. Every name resolves to a single IP-address (A-record) and the IP resolves back to that name (PTR) for every single server. The thing is, that for a certain file (mypackage.cab) I get different results depending on whether I use: \\192.0.2.01\fs\pkg\X12345678 or \\example01.foo\fs\pkg\X12345678 While in one case the file is correct in the other case the file has exactly the right size, but it is all zeros. For a certain combination of client and server I can reproduce this reliably. It doesn´t matter if I download in Windows Explorer, via robocopy or even from Linux with smbclient. It´s always the same, one file corrupt, the other ok. It happens only for certain combinations of clients and servers, not others. For example: client01 example01.foo -> OK (192.0.2.01 is also OK) client01 example02.foo -> broken (but 192.0.2.02 is OK) client02 example01.foo -> broken (but 192.0.2.01 is OK) client02 example02.foo -> OK (192.0.2.02 is also OK) client03 example06.foo -> OK (but 192.0.2.06 is broken) client03 example07.foo -> OK (192.0.2.07 is also OK) etc... In some cases I get the broken file when I use the IP address in other cases when I use the name. For every client the majority of servers is Ok, but from every client I tested I have at least 4 cases of broken files. All this happens only for mypackage.cab (about 5k in size), it never happened for any of the other files in the same directory. Confused? Certainly I am. Any idea what can cause this or any idea what to try to figure it out is welcome. Clients are Windows XP. Servers are NetApp filers I don´t have access to. I can (and will) contact the filer team again, but first I have to have an idea what is going on.

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• network policy + WPA enterprise (tkip) Windows 2008 R2

  - by Aceth

  hi I've attempted the following guide and in a bit of a pickle. http://techblog.mirabito.net.au/?p=87 My main goal is to have a username / password based wireless authentication with active directory integration. I keep getting the error Network Policy Server denied access to a user. Contact the Network Policy Server administrator for more information. User: Security ID: domain\rhysbeta Account Name: rhysbeta Account Domain: domain Fully Qualified Account Name: domain\rhysbeta Client Machine: Security ID: NULL SID Account Name: - Fully Qualified Account Name: - OS-Version: - Called Station Identifier: 00-12-BF-00-71-3C:wirelessname Calling Station Identifier: 00-23-76-5D-1E-31 NAS: NAS IPv4 Address: 0.0.0.0 NAS IPv6 Address: - NAS Identifier: - NAS Port-Type: Wireless - IEEE 802.11 NAS Port: 2 RADIUS Client: Client Friendly Name: Belkin54g Client IP Address: x.x.x.10 Authentication Details: Connection Request Policy Name: Secure Wireless Connections Network Policy Name: Secure Wireless Connections Authentication Provider: Windows Authentication Server: srvr.example.com Authentication Type: EAP EAP Type: - Account Session Identifier: - Logging Results: Accounting information was written to the local log file. Reason Code: 22 Reason: The client could not be authenticated because the Extensible Authentication Protocol (EAP) Type cannot be processed by the server. ` I would love to have it so that non domain devices

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• Apache: How to redirect OPTIONS request with .htaccess?

  - by Milan Babuškov

  I have Apache 2.2.4 server with a lot of messages like this in the access_log: ::1 - - [15/May/2010:19:55:01 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:22:17 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:24:58 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:25:55 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:27:14 +0200] "OPTIONS * HTTP/1.0" 400 543 These are the "internal dummy connections" as explained on this page: http://wiki.apache.org/httpd/InternalDummyConnection The page also hits my main problem: "In 2.2.6 and earlier, in certain configurations, these requests may hit a heavy-weight dynamic web page and cause unnecessary load on the server. You can avoid this by using mod_rewrite to respond with a redirect when accessed with that specific User-Agent or IP address." Well, obviously I cannot use UserAgent because I minimized the server signature, but I could use IP address. However, I don't have a clue what should the RewriteCond and RewriteRule look for IPv6 address ::1. The website where this runs is using CodeIgniter, so there is already the following .htaccess in place, I just need to add to it: RewriteEngine on RewriteCond %{REQUEST_URI} ^/system.* RewriteRule ^(.*)$ /index.php?/$1 [G] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /index.php?/$1 [L] Any idea how to write this .htaccess rule?

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• Netinstalling CentOS if the gateway is in a different subnet

  - by James Lawrie

  I have a KVM host (A) running a virtual machine (B). They each have their own external IP address and the networking is setup using bridging between eth0 and br0 on A. B uses eth0, with A being the gateway. The problem is that the two external IP addresses are on different subnets (different /8s in fact) so by default, B claims it cannot reach A (Network Unreachable). I can resolve this by adding a static route on B: echo "any host gateway_ip dev eth0" > /etc/sysconfig/static-routes Modifying /etc/init.d/networking to reload the gateway after applying static routes (I only added the final line before fi): if [ -f /etc/sysconfig/static-routes ]; then grep "^any" /etc/sysconfig/static-routes | while read ignore args ; do /sbin/route add -$args done route add default gw "${GATEWAY}" fi If I then restart networking, it comes online. How can I do this (or work around it some other way) prior to the system being installed, ideally inside an Anaconda kickstart file?

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• How can I have APF block script kiddies that mod_security detects?

  - by Gaia

  In one of the vhosts' error_log I found thousands of lines like these, all from the same IP: [Mon Apr 19 08:15:59 2010] [error] [client 61.147.67.206] mod_security: Access denied with code 403. Pattern match "(chr|fwrite|fopen|system|e?chr|passthru|popen|proc_open|shell_exec|exec|proc_nice|proc_terminate|proc_get_status|proc_close|pfsockopen|leak|apache_child_terminate|posix_kill|posix_mkfifo|posix_setpgid|posix_setsid|posix_setuid|phpinfo)\\\\(.*\\\\)\\\\;" at THE_REQUEST [id "330001"] [rev "1"] [msg "Generic PHP exploit pattern denied"] [severity "CRITICAL"] [hostname "x.x.x.x"] [uri "//webmail/config.inc.php?p=phpinfo();"] Given how obvious the situation is, how come mod_security isnt automatically adding at least that IP to deny rules? There is no way someone hasnt thought of this before...

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• Reproducible file corruption for files on windows share

  - by bbuser

  We have about 40 file servers in our intranet to distribute software packages. The servers have names like example01, example02 etc. Every name resolves to a single IP-address (A-record) and the IP resolves back to that name (PTR) for every single server. The thing is, that for a certain file (mypackage.cab) I get different results depending on whether I use: \\192.0.2.01\fs\pkg\X12345678 or \\example01.foo\fs\pkg\X12345678 While in one case the file is correct in the other case the file has exactly the right size, but it is all zeros. For a certain combination of client and server I can reproduce this reliably. It doesn´t matter if I download in Windows Explorer, via robocopy or even from Linux with smbclient. It´s always the same, one file corrupt, the other ok. It happens only for certain combinations of clients and servers, not others. For example: client01 example01.foo -> OK (192.0.2.01 is also OK) client01 example02.foo -> broken (but 192.0.2.02 is OK) client02 example01.foo -> broken (but 192.0.2.01 is OK) client02 example02.foo -> OK (192.0.2.02 is also OK) client03 example06.foo -> OK (but 192.0.2.06 is broken) client03 example07.foo -> OK (192.0.2.07 is also OK) etc... In some cases I get the broken file when I use the IP address in other cases when I use the name. For every client the majority of servers is Ok, but from every client I tested I have at least 4 cases of broken files. All this happens only for mypackage.cab (about 5k in size), it never happened for any of the other files in the same directory. Confused? Certainly I am. Any idea what can cause this or any idea what to try to figure it out is welcome. Clients are Windows XP. Servers are NetApp filers I don´t have access to. I can (and will) contact the filer team again, but first I have to have an idea what is going on.

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• Long access time for static web page on virtual machine

  - by Karol

  My setup Windows 7 on workstation that I use at work (with domain) and home (no domain) Virtual machine (VMWare) that runs Arch Linux (I will call it just "Linux") with network interface in bridged mode. Linux serves web pages with Nginx. IP address of Linux machine is 192.168.0.16 and is added to C:\windows\system32\drivers\etc\hosts: 192.168.0.16 bridged bri IP address of Windows workstation is added to /etc/hosts: 192.168.0.10 workstation I can add more details to my setup description (I am not sure what is relevant). The question Often (but not always) it takes long time for a web browser (Firefox) to open static web page served by Linux. I am sure it is not a performance issue. To be more specific: it takes about ~20 seconds to resolve(?) the address http://bridged for a web browser. Additionally I have just installed samba service and noticed similar problem, so it is not specific to browser & http. Initial access for samba shares also takes long time.

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• Two DHCP servers on the same network

  - by CesarGon

  We are setting up a routing link between the Windows Server 2008 networks of two different buildings in my organisation. Each network uses a different IP addressing scheme (one uses public addresses, the other one uses private), but the goal is having a single Windows Server domain across the gap between the buildings. The link is provided by a 100-Mbps point-to-point line. I have always understood that you should not have more than one DHCP server on a network. However, we are planning to put a domain controller on each building, and each domain controller will be a DNS server and a DHCP server as well. The intention is that a machine booting up in building A gets its IP address from the DHCP server closer to it, in building A, while a machine booting up in building B gets an address from the DHCP server in building B. Since the two buildings will be linked and the network will be only one, will this work? How can I avoid that a machine booting up in building A gets an address from the DHCP server in building B (or vice versa)? Thanks.

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• Two DHCP servers on the same network

  - by CesarGon

  We are setting up a routing link between the Windows Server 2008 networks of two different buildings in my organisation. Each network uses a different IP addressing scheme (one uses public addresses, the other one uses private), but the goal is having a single Windows Server domain across the gap between the buildings. The link is provided by a 100-Mbps point-to-point line. I have always understood that you should not have more than one DHCP server on a network. However, we are planning to put a domain controller on each building, and each domain controller will be a DNS server and a DHCP server as well. The intention is that a machine booting up in building A gets its IP address from the DHCP server closer to it, in building A, while a machine booting up in building B gets an address from the DHCP server in building B. Since the two buildings will be linked and the network will be only one, will this work? How can I avoid that a machine booting up in building A gets an address from the DHCP server in building B (or vice versa)? Thanks.

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• chrooting user causes "connection closed" message when using sftp

  - by George Reith

  First off I am a linux newbie so please don't assume much knowledge. I am using CentOS 5.8 (final) and using OpenSSH version 5.8p1. I have made a user playwithbits and I am attempting to chroot them to the directory home/nginx/domains/playwithbits/public I am using the following match statement in my sshd_config file: Match group web-root-locked ChrootDirectory /home/nginx/domains/%u/public X11Forwarding no AllowTcpForwarding no ForceCommand /usr/libexec/openssh/sftp-server # id playwithbits returns: uid=504(playwithbits) gid=504(playwithbits) groups=504(playwithbits),507(web-root-locked) I have changed the user's home directory to: home/nginx/domains/playwithbits/public Now when I attempt to sftp in with this user I instantly get the message: connection closed Does anyone know what I am doing wrong? Edit: Following advice from @Dennis Williamson I have connected in debug mode (I think... correct me if I'm wrong). I have made a bit of progress by using chmod to set permissions recursively of all files in the directly to 700. Now I get the following messages when I attempt to log on (still connection refused): Connection from [My ip address] port 38737 debug1: Client protocol version 2.0; client software version OpenSSH_5.6 debug1: match: OpenSSH_5.6 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.8 debug1: permanently_set_uid: 74/74 debug1: list_hostkey_types: ssh-rsa,ssh-dss debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: client->server aes128-ctr hmac-md5 none debug1: kex: server->client aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: KEX done debug1: userauth-request for user playwithbits service ssh-connection method none debug1: attempt 0 failures 0 debug1: user playwithbits matched group list web-root-locked at line 91 debug1: PAM: initializing for "playwithbits" debug1: PAM: setting PAM_RHOST to [My host info] debug1: PAM: setting PAM_TTY to "ssh" debug1: userauth-request for user playwithbits service ssh-connection method password debug1: attempt 1 failures 0 debug1: PAM: password authentication accepted for playwithbits debug1: do_pam_account: called Accepted password for playwithbits from [My ip address] port 38737 ssh2 debug1: monitor_child_preauth: playwithbits has been authenticated by privileged process debug1: SELinux support disabled debug1: PAM: establishing credentials User child is on pid 3942 debug1: PAM: establishing credentials Changed root directory to "/home/nginx/domains/playwithbits/public" debug1: permanently_set_uid: 504/504 debug1: Entering interactive session for SSH2. debug1: server_init_dispatch_20 debug1: server_input_channel_open: ctype session rchan 0 win 2097152 max 32768 debug1: input_session_request debug1: channel 0: new [server-session] debug1: session_new: session 0 debug1: session_open: channel 0 debug1: session_open: session 0: link with channel 0 debug1: server_input_channel_open: confirm session debug1: server_input_global_request: rtype [email protected] want_reply 0 debug1: server_input_channel_req: channel 0 request env reply 0 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req env debug1: server_input_channel_req: channel 0 request subsystem reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req subsystem subsystem request for sftp by user playwithbits debug1: subsystem: cannot stat /usr/libexec/openssh/sftp-server: Permission denied debug1: subsystem: exec() /usr/libexec/openssh/sftp-server debug1: Forced command (config) '/usr/libexec/openssh/sftp-server' debug1: session_new: session 0 debug1: Received SIGCHLD. debug1: session_by_pid: pid 3943 debug1: session_exit_message: session 0 channel 0 pid 3943 debug1: session_exit_message: release channel 0 debug1: session_by_channel: session 0 channel 0 debug1: session_close_by_channel: channel 0 child 0 debug1: session_close: session 0 pid 0 debug1: channel 0: free: server-session, nchannels 1 Received disconnect from [My ip address]: 11: disconnected by user debug1: do_cleanup debug1: do_cleanup debug1: PAM: cleanup debug1: PAM: closing session debug1: PAM: deleting credentials

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• Unstable DNS with bind

  - by yasser abd

  we have a Centos machine called jupiter, on which I have installed bind9, On every other machine the DNS is set to be the IP address of jupiter (192.168.2.101), as you can see in the output of the following command in windows >ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : mypcs Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom NetXtreme 57xx Gigabit Controller Physical Address. . . . . . . . . : 00-1A-A0-AC-E4-CC DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::c16d:3ae4:5907:30c4%8(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.2.98(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Thursday, September 20, 2012 10:26:11 AM Lease Expires . . . . . . . . . . : Sunday, September 23, 2012 10:26:10 AM Default Gateway . . . . . . . . . : 192.168.2.1 DHCP Server . . . . . . . . . . . : 192.168.2.1 DHCPv6 IAID . . . . . . . . . . . : 201333408 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-3A-50-01-00-1A-A0-AC-E4-CC DNS Servers . . . . . . . . . . . : 192.168.2.101 192.168.2.1 192.168.2.1 NetBIOS over Tcpip. . . . . . . . : Enabled All machines can always nslookup one of the domain (mydomain.com) that is set in the jupiter's DNS server, you can see that in the output of nslookup on the same windows machine: >nslookup mydomain.com Server: UnKnown Address: 192.168.2.101 Name: mydomain.com Address: 192.168.2.100 The problem is, sometimes mydomain.com can not be pinged, here is the output of the ping on the same windows machine >ping mydomain.com Ping request could not find host mydomain.com. Please check the name and try again. This looks very random, and happens once in a while, so the machine can lookup the DNS records but can't ping it, nor can browse the website that is hosted on mydomain.com, which should resolve to 192.168.2.100 On a linux machine that has the same DNS settings, the output of dig command for mydomain is as follows: $ dig mydomain.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.2 <<>> mydomain.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36090 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1 ;; QUESTION SECTION: ;mydomain.com. IN A ;; ANSWER SECTION: mydomain.com. 86400 IN A 192.168.2.100 ;; AUTHORITY SECTION: mydomain.com. 86400 IN NS jupiter. ;; ADDITIONAL SECTION: jupiter. 86400 IN A 192.168.2.101 ;; Query time: 1 msec ;; SERVER: 192.168.2.101#53(192.168.2.101) ;; WHEN: Thu Sep 20 16:32:14 2012 ;; MSG SIZE rcvd: 83 We've never had the same problem on MACs, they always resolve mydomain.com Here is how I have defined mydomain.com on Bind9's configs on Jupiter, notice that the name of the machine on 192.168.2.100 is venus, so I have this file: /var/named/named.venus: $TTL 1D @ IN SOA jupiter. admin.ourcompany.com. ( 2003052800 ; serial 86400 ; refresh 300 ; retry 604800 ; expire 3600 ; minimum ) @ IN NS jupiter. @ IN A 192.168.2.100 * IN A 192.168.2.100 /var/named/zones/named.venus.zone zone "mydomain.com" IN {type master;file "/var/named/named.venus";allow-update {none;};}; One thing to note is that I haven't defined reverse DNS lookups, only the forward DNS lookups are defined in Bind9 configs, not sure if that's relevant or not. So my question is, why is this being so unstable? what could be the cause?

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• Local Area Connection in Slacware 13

  - by asdasd

  I have windows xp and slackware 13 on one computer, and the ISP provided me a new modem. There was manual how to configure it, so i start the web browser and typed it's ip address 192.168.1.1 and the web interface of the modem appeared so i logged in, that was easy. But under slackware, i don't know how to enter in the modem config / web interface. I type in 192.168.1.1 but it's not working. Here's the output of ifconfig eth0 : eth0 Link encap:Ethernet HWaddr 00:a1:b0:01:18:28 inet addr:169.254.73.8 Bcast:169.254.255.255 Mask:255.255.0.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:17 Memory:febff400-febff4ff How can i log in into the modem from linux, i.e. find it's assigned ip under slackware ? Thank you.

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• Hostname problems in CentOS 5.5

  - by spoon16

  I just set up a CentOS 5.5 machine on my local network and attempted to modify the hostname by editing /etc/sysconfig/network file. When I'm logged in locally the change to the hostname is reflected and seems to be working fine. When I open a SSH session via PuTTY from Windows this is what I see at the prompt: [root@? ~]# cat /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=yes HOSTNAME=mini.local [root@? ~]# sysctl kernel.hostname kernel.hostname = ? [root@? ~]# hostname ? [root@? ~]# hostname -f hostname: Unknown server error A couple of other symptoms that may be helpful in troubleshooting this problem. I can ping the CentOS box from my Windows machine via IP but not hostname. Also, my Netgear router does not display the hostname when I view the "Connected Devices", I do see the mac address and the proper IP listed though. How can I make it so that the hostname is properly propagated throughout my network?

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• Need IPSec help on Windows 2003

  - by user37456

  Hey guys, I am trying to configure IPSec between a web and app server in our environment. I want all traffic between these two servers to use IPsec and be encrypted. These servers are on the same domain so i am currently using Kerebos for security, I have also tried pre-defined keys and nothing changed. When I try and ping between the servers I get "Negotiating IP Security" everytime. I have also confirmed that when I change "Require Security" to "Permit" everything works so IPSec is working, I believe its something with my security setup. Under the security tab both servers have the default 3DES keys first and then DES keys. I have also specified tunnel endpoints (the alternate server's IP). What am I missing? Thanks for any help..

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• What equipment do real ISP's use?

  - by Allanrbo

  In a dormitory of 550 residents, people often mistakenly set up DHCP servers for the whole network by plugging in their private Wi-Fi routers wrongly. Also recently, someone mistakenly configured their PC to a static IP being the same as that of the default gateway. We use cheap 3Com switches at the moment. I know that Cisco switches support DHCP snooping to solve the DHCP problem, but that still does not solve the default gateway IP takeover problem. What sort of switch equipment do real ISP's use so their customers cannot break the network for the other customers?

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• Accessing through VPN, which internet connection would be used

  - by Sriram

  I've a data card which has a limit of 2 GB up/download traffic per month. I've an office internet line which has an unlimited up/download. I've successfully connected to VPN using my data card and by changing certain configurations like DNS etc., have also been able to use my office line for internet (verified by doing a IP check - returns the static IP of our office). Now to my question - is it just a NAT which is happening or am I actually using my office line for all communication. Which one would reflect the usage/trace. The data card usage log at this moment does not reflect any usage (which is confusing since the VPN is over the data card connection). Further more (theoretically), would the net be any faster if my office line is let us say 8Mbps and the data card is 512kbps by doing this as against directly connecting the internet using the data card.

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• I have added a port to the public zone in firewalld but still can't access the port

  - by mikemaccana

  I've been using iptables for a long time, but have never used firewalld until recently. I have enabled port 3000 TCP via firewalld with the following command: # firewall-cmd --zone=public --add-port=3000/tcp --permanent However I can't access the server on port 3000. From an external box: telnet 178.62.16.244 3000 Trying 178.62.16.244... telnet: connect to address 178.62.16.244: Connection refused There are no routing issues: I have a separate rule for a port forward from port 80 to port 8000 which works fine externally. My app is definitely listening on the port too: Proto Recv-Q Send-Q Local Address Foreign Address State User Inode PID/Program name tcp 0 0 0.0.0.0:3000 0.0.0.0:* LISTEN 99 36797 18662/node firewall-cmd doesn't seem to show the port either - see how ports is empty. You can see the forward rule I mentioned earlier. # firewall-cmd --list-all public (default, active) interfaces: eth0 sources: services: dhcpv6-client ssh ports: masquerade: no forward-ports: port=80:proto=tcp:toport=8000:toaddr= icmp-blocks: rich rules: However I can see the rule in the XML config file: # cat /etc/firewalld/zones/public.xml <?xml version="1.0" encoding="utf-8"?> <zone> <short>Public</short> <description>For use in public areas. You do not trust the other computers on networks to not harm your computer. Only selected incoming connections are accepted.</description> <service name="dhcpv6-client"/> <service name="ssh"/> <port protocol="tcp" port="3000"/> <forward-port to-port="8000" protocol="tcp" port="80"/> </zone> What else do I need to do to allow access to my app on port 3000? Also: is adding access via a port the correct thing to do? Or should I make a firewalld 'service' for my app instead?

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• Microsoft Windows DHCP: Steering IPv4 clients into specific scopes based on MAC

  - by Easter Sunshine

  We have visitors on our campus who bring their own laptops and devices and use our wireless and wired networks. When we receive a copyright infringement notice (typically BitTorrenting), we are required to quarantine that MAC address so that it no longer has Internet access. No matter what website it tries to visit, it is sent to a web page explaining to the user that the device has been quarantined. We have thus far implemented this in ISC DHCP on Linux. We have multiple VLANs with one or more public-IP subnets and one RFC1918 quarantine subnet each. All clients are leased IPs in the public-IP subnet(s) unless you're in a list of known bad MACs. Then, you are sent to the quarantine subnet so that your traffic is unroutable on the Internet (you are isolated by subnet only, not by VLAN). We would like to move to Windows DHCP in light of the IPAM role but I cannot figure out how to replicate this in Windows DHCP 2012 (Assign DHCP IPs for specific MAC prefixes on Windows Server 2008 R2 suggests it was not possible in 2008 R2), even while using policies. So here's what I'd like: The administrator/help desk provides and maintains a list of MAC addresses that are to be quarantined. The DHCP server places those MACs into the quarantine subnet on the respective VLAN, no matter which VLAN the client is in. I don't think reservations would work: We currently have about 300 registered bad MACs and about 12 VLANs. I don't want to make 300 x 12 reservations nor have to add 12 reservations per new MAC address. Not to mention all of the quarantine subnets are /24s. We do not have NPS/NAC. You do not have to register your MAC address get network access. We use Cisco routers/switches. Thanks.

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