dns server - Page 276 - Developer IT

Can I reuse my existing TCP-Server?

- by Helper Method

At the moment I have an existing application which basically consists of a desktop GUI and a TCP server. The client connects to the server, and the server notifies the client if something interesting happens. Now I'm supposed to replace the desktop GUI by a web GUI, and I'm wondering if I have to rewrite the server to send http packets instead of tcp packets or if I can somehow use some sort of proxy to grab the tcp packets and forward them to the web client? Do I need some sort of comet server?

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SSH new connection begins to hang (not reject or terminate) after a day or so on Ubuntu 13.04 server

- by kross

Recently we upgraded the server from 12.04 LTS server to 13.04. All was well, including after a reboot. With all packages updated we began to see a strange issue, ssh works for a day or so (unclear on timing) then a later request for SSH hangs (cannot ctrl+c, nothing). It is up and serving webserver traffic etc. Port 22 is open (ips etc altered slightly for posting): nmap -T4 -A x.acme.com Starting Nmap 6.40 ( http://nmap.org ) at 2013-09-12 16:01 CDT Nmap scan report for x.acme.com (69.137.56.18) Host is up (0.026s latency). rDNS record for 69.137.56.18: c-69-137-56-18.hsd1.tn.provider.net Not shown: 998 filtered ports PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 6.1p1 Debian 4 (protocol 2.0) | ssh-hostkey: 1024 54:d3:e3:38:44:f4:20:a4:e7:42:49:d0:a7:f1:3e:21 (DSA) | 2048 dc:21:77:3b:f4:4e:74:d0:87:33:14:40:04:68:33:a6 (RSA) |_256 45:69:10:79:5a:9f:0b:f0:66:15:39:87:b9:a1:37:f7 (ECDSA) 80/tcp open http Jetty 7.6.2.v20120308 | http-title: Log in as a Bamboo user - Atlassian Bamboo |_Requested resource was http://x.acme.com/userlogin!default.action;jsessionid=19v135zn8cl1tgso28fse4d50?os_destination=%2Fstart.action Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel Service detection performed. Please report any incorrect results at http://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 12.89 seconds Here is the ssh -vvv: ssh -vvv x.acme.com OpenSSH_5.9p1, OpenSSL 0.9.8x 10 May 2012 debug1: Reading configuration data /Users/tfergeson/.ssh/config debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to x.acme.com [69.137.56.18] port 22. debug1: Connection established. debug3: Incorrect RSA1 identifier debug3: Could not load "/Users/tfergeson/.ssh/id_rsa" as a RSA1 public key debug1: identity file /Users/tfergeson/.ssh/id_rsa type 1 debug1: identity file /Users/tfergeson/.ssh/id_rsa-cert type -1 debug1: identity file /Users/tfergeson/.ssh/id_dsa type -1 debug1: identity file /Users/tfergeson/.ssh/id_dsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.1p1 Debian-4 debug1: match: OpenSSH_6.1p1 Debian-4 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9 debug2: fd 3 setting O_NONBLOCK debug3: load_hostkeys: loading entries for host "x.acme.com" from file "/Users/tfergeson/.ssh/known_hosts" debug3: load_hostkeys: found key type RSA in file /Users/tfergeson/.ssh/known_hosts:10 debug3: load_hostkeys: loaded 1 keys debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],ssh-rsa debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: [email protected],[email protected],ssh-rsa,[email protected],[email protected],ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,[email protected],zlib debug2: kex_parse_kexinit: none,[email protected],zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,[email protected] debug2: kex_parse_kexinit: none,[email protected] debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: found hmac-md5 debug1: kex: server->client aes128-ctr hmac-md5 none debug2: mac_setup: found hmac-md5 debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug2: dh_gen_key: priv key bits set: 130/256 debug2: bits set: 503/1024 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA dc:21:77:3b:f4:4e:74:d0:87:33:14:40:04:68:33:a6 debug3: load_hostkeys: loading entries for host "x.acme.com" from file "/Users/tfergeson/.ssh/known_hosts" debug3: load_hostkeys: found key type RSA in file /Users/tfergeson/.ssh/known_hosts:10 debug3: load_hostkeys: loaded 1 keys debug3: load_hostkeys: loading entries for host "69.137.56.18" from file "/Users/tfergeson/.ssh/known_hosts" debug3: load_hostkeys: found key type RSA in file /Users/tfergeson/.ssh/known_hosts:6 debug3: load_hostkeys: loaded 1 keys debug1: Host 'x.acme.com' is known and matches the RSA host key. debug1: Found key in /Users/tfergeson/.ssh/known_hosts:10 debug2: bits set: 493/1024 debug1: ssh_rsa_verify: signature correct debug2: kex_derive_keys debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /Users/tfergeson/.ssh/id_rsa (0x7ff189c1d7d0) debug2: key: /Users/tfergeson/.ssh/id_dsa (0x0) debug1: Authentications that can continue: publickey debug3: start over, passed a different list publickey debug3: preferred publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/tfergeson/.ssh/id_rsa debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug1: Server accepts key: pkalg ssh-rsa blen 277 debug2: input_userauth_pk_ok: fp 3c:e5:29:6c:9d:27:d1:7d:e8:09:a2:e8:8e:6e:af:6f debug3: sign_and_send_pubkey: RSA 3c:e5:29:6c:9d:27:d1:7d:e8:09:a2:e8:8e:6e:af:6f debug1: read PEM private key done: type RSA debug1: Authentication succeeded (publickey). Authenticated to x.acme.com ([69.137.56.18]:22). debug1: channel 0: new [client-session] debug3: ssh_session2_open: channel_new: 0 debug2: channel 0: send open debug1: Requesting [email protected] debug1: Entering interactive session. debug2: callback start debug2: client_session2_setup: id 0 debug2: fd 3 setting TCP_NODELAY debug2: channel 0: request pty-req confirm 1 debug1: Sending environment. debug3: Ignored env ATLAS_OPTS debug3: Ignored env rvm_bin_path debug3: Ignored env TERM_PROGRAM debug3: Ignored env GEM_HOME debug3: Ignored env SHELL debug3: Ignored env TERM debug3: Ignored env CLICOLOR debug3: Ignored env IRBRC debug3: Ignored env TMPDIR debug3: Ignored env Apple_PubSub_Socket_Render debug3: Ignored env TERM_PROGRAM_VERSION debug3: Ignored env MY_RUBY_HOME debug3: Ignored env TERM_SESSION_ID debug3: Ignored env USER debug3: Ignored env COMMAND_MODE debug3: Ignored env rvm_path debug3: Ignored env COM_GOOGLE_CHROME_FRAMEWORK_SERVICE_PROCESS/USERS/tfergeson/LIBRARY/APPLICATION_SUPPORT/GOOGLE/CHROME_SOCKET debug3: Ignored env JPDA_ADDRESS debug3: Ignored env APDK_HOME debug3: Ignored env SSH_AUTH_SOCK debug3: Ignored env Apple_Ubiquity_Message debug3: Ignored env __CF_USER_TEXT_ENCODING debug3: Ignored env rvm_sticky_flag debug3: Ignored env MAVEN_OPTS debug3: Ignored env LSCOLORS debug3: Ignored env rvm_prefix debug3: Ignored env PATH debug3: Ignored env PWD debug3: Ignored env JAVA_HOME debug1: Sending env LANG = en_US.UTF-8 debug2: channel 0: request env confirm 0 debug3: Ignored env JPDA_TRANSPORT debug3: Ignored env rvm_version debug3: Ignored env M2_HOME debug3: Ignored env HOME debug3: Ignored env SHLVL debug3: Ignored env rvm_ruby_string debug3: Ignored env LOGNAME debug3: Ignored env M2_REPO debug3: Ignored env GEM_PATH debug3: Ignored env AWS_RDS_HOME debug3: Ignored env rvm_delete_flag debug3: Ignored env EC2_PRIVATE_KEY debug3: Ignored env RUBY_VERSION debug3: Ignored env SECURITYSESSIONID debug3: Ignored env EC2_CERT debug3: Ignored env _ debug2: channel 0: request shell confirm 1 debug2: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 I can hard reboot (only mac monitors at that location) and it will again be accessible. This now happens every single time. It is imperative that I get it sorted. The strange thing is that it behaves initially then starts to hang after several hours. I perused logs previously and nothing stood out. From the auth.log, I can see that it has allowed me in, but still I get nothing back on the client side: Sep 20 12:47:50 cbear sshd[25376]: Accepted publickey for tfergeson from 10.1.10.14 port 54631 ssh2 Sep 20 12:47:50 cbear sshd[25376]: pam_unix(sshd:session): session opened for user tfergeson by (uid=0) UPDATES: Still occurring even after setting UseDNS no and commenting out #session optional pam_mail.so standard noenv This does not appear to be a network/dns related issue, as all services running on the machine are as responsive and accessible as ever, with the exception of sshd. Any thoughts on where to start?

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Working With Extended Events

- by Fatherjack

SQL Server 2012 has made working with Extended Events (XE) pretty simple when it comes to what sessions you have on your servers and what options you have selected and so forth but if you are like me then you still have some SQL Server instances that are 2008 or 2008 R2. For those servers there is no built-in way to view the Extended Event sessions in SSMS. I keep coming up against the same situations – Where are the xel log files? What events, actions or predicates are set for the events on the server? What sessions are there on the server already? I got tired of this being a perpetual question and wrote some TSQL to save as a snippet in SQL Prompt so that these details are permanently only a couple of clicks away. First, some history. If you just came here for the code skip down a few paragraphs and it’s all there. If you want a little time to reminisce about SQL Server then stick with me through the next paragraph or two. We are in a bit of a cross-over period currently, there are many versions of SQL Server but I would guess that SQL Server 2008, 2008 R2 and 2012 comprise the majority of installations. With each of these comes a set of management tools, of which SQL Server Management Studio (SSMS) is one. In 2008 and 2008 R2 Extended Events made their first appearance and there was no way to work with them in the SSMS interface. At some point the Extended Events guru Jonathan Kehayias (http://www.sqlskills.com/blogs/jonathan/) created the SQL Server 2008 Extended Events SSMS Addin which is really an excellent tool to ease XE session administration. This addin will install in SSMS 2008 or 2008R2 but not SSMS 2012. If you use a compatible version of SSMS then I wholly recommend downloading and using it to make your work with XE much easier. If you have SSMS 2012 installed, and there is no reason not to as it will let you work with all versions of SQL Server, then you cannot install this addin. If you are working with SQL Server 2012 then SSMS 2012 has built in functionality to manage XE sessions – this functionality does not apply for 2008 or 2008 R2 instances though. This means you are somewhat restricted and have to use TSQL to manage XE sessions on older versions of SQL Server. OK, those of you that skipped ahead for the code, you need to start from here: So, you are working with SSMS 2012 but have a SQL Server that is an earlier version that needs an XE session created or you think there is a session created but you aren’t sure, or you know it’s there but can’t remember if it is running and where the output is going. How do you find out? Well, none of the information is hidden as such but it is a bit of a wrangle to locate it and it isn’t a lot of code that is unlikely to remain in your memory. I have created two pieces of code. The first examines the SYS.Server_Event_… management views in combination with the SYS.DM_XE_… management views to give the name of all sessions that exist on the server, regardless of whether they are running or not and two pieces of TSQL code. One piece will alter the state of the session: if the session is running then the code will stop the session if executed and vice versa. The other piece of code will drop the selected session. If the session is running then the code will stop it first. Do not execute the DROP code unless you are sure you have the Create code to hand. It will be dropped from the server without a second chance to change your mind. /**************************************************************/ /*** To locate and describe event sessions on a server ***/ /*** ***/ /*** Generates TSQL to start/stop/drop sessions ***/ /*** ***/ /*** Jonathan Allen - @fatherjack ***/ /*** June 2013 ***/ /*** ***/ /**************************************************************/ SELECT [EES].[name] AS [Session Name - all sessions] , CASE WHEN [MXS].[name] IS NULL THEN ISNULL([MXS].[name], 'Stopped') ELSE 'Running' END AS SessionState , CASE WHEN [MXS].[name] IS NULL THEN ISNULL([MXS].[name], 'ALTER EVENT SESSION [' + [EES].[name] + '] ON SERVER STATE = START;') ELSE 'ALTER EVENT SESSION [' + [EES].[name] + '] ON SERVER STATE = STOP;' END AS ALTER_SessionState , CASE WHEN [MXS].[name] IS NULL THEN ISNULL([MXS].[name], 'DROP EVENT SESSION [' + [EES].[name] + '] ON SERVER; -- This WILL drop the session. It will no longer exist. Don't do it unless you are certain you can recreate it if you need it.') ELSE 'ALTER EVENT SESSION [' + [EES].[name] + '] ON SERVER STATE = STOP; ' + CHAR(10) + '-- DROP EVENT SESSION [' + [EES].[name] + '] ON SERVER; -- This WILL stop and drop the session. It will no longer exist. Don't do it unless you are certain you can recreate it if you need it.' END AS DROP_Session FROM [sys].[server_event_sessions] AS EES LEFT JOIN [sys].[dm_xe_sessions] AS MXS ON [EES].[name] = [MXS].[name] WHERE [EES].[name] NOT IN ( 'system_health', 'AlwaysOn_health' ) ORDER BY SessionState GO I have excluded the system_health and AlwaysOn sessions as I don’t want to accidentally execute the drop script for these sessions that are created as part of the SQL Server installation. It is possible to recreate the sessions but that is a whole lot of aggravation I’d rather avoid. The second piece of code gathers details of running XE sessions only and provides information on the Events being collected, any predicates that are set on those events, the actions that are set to be collected, where the collected information is being logged and if that logging is to a file target, where that file is located. /**********************************************/ /*** Running Session summary ***/ /*** ***/ /*** Details key values of XE sessions ***/ /*** that are in a running state ***/ /*** ***/ /*** Jonathan Allen - @fatherjack ***/ /*** June 2013 ***/ /*** ***/ /**********************************************/ SELECT [EES].[name] AS [Session Name - running sessions] , [EESE].[name] AS [Event Name] , COALESCE([EESE].[predicate], 'unfiltered') AS [Event Predicate Filter(s)] , [EESA].[Action] AS [Event Action(s)] , [EEST].[Target] AS [Session Target(s)] , ISNULL([EESF].[value], 'No file target in use') AS [File_Target_UNC] -- select * FROM [sys].[server_event_sessions] AS EES INNER JOIN [sys].[dm_xe_sessions] AS MXS ON [EES].[name] = [MXS].[name] INNER JOIN [sys].[server_event_session_events] AS [EESE] ON [EES].[event_session_id] = [EESE].[event_session_id] LEFT JOIN [sys].[server_event_session_fields] AS EESF ON ( [EES].[event_session_id] = [EESF].[event_session_id] AND [EESF].[name] = 'filename' ) CROSS APPLY ( SELECT STUFF(( SELECT ', ' + sest.name FROM [sys].[server_event_session_targets] AS SEST WHERE [EES].[event_session_id] = [SEST].[event_session_id] FOR XML PATH('') ), 1, 2, '') AS [Target] ) AS EEST CROSS APPLY ( SELECT STUFF(( SELECT ', ' + [sesa].NAME FROM [sys].[server_event_session_actions] AS sesa WHERE [sesa].[event_session_id] = [EES].[event_session_id] FOR XML PATH('') ), 1, 2, '') AS [Action] ) AS EESA WHERE [EES].[name] NOT IN ( 'system_health', 'AlwaysOn_health' ) /*Optional to exclude 'out-of-the-box' traces*/ I hope that these scripts are useful to you and I would be obliged if you would keep my name in the script comments. I have no problem with you using it in production or personal circumstances, however it has no warranty or guarantee. Don’t use it unless you understand it and are happy with what it is going to do. I am not ever responsible for the consequences of executing this script on your servers.

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SPF Failure sending sms message to sms.mycricket.com

- by CodeGurl

I built an asp.net application that sends text messages to our employees using carrier-provided email to SMS gateways. The people on Cricket (sms.mycricket.com) are the only ones that are bouncing with a return message like this: Unknown address error SPF FAILURE/Sender has no SPF records: SEE RFC 4408 - FROM check failed: Received: from unknown (HELO servername.domainname.com) ([ipaddress]) by .... with ESMTP/TLS/DHE-RSA-AES256-SHA; 14 Nov 2012 06:22:56 -0600 From my research it looks like we may need to setup something in DNS for the Sender Policy Framework. I'm not in the networking group so I don't know much about this. How can this be done? http://en.wikipedia.org/wiki/Sender_Policy_Framework

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The vps is running, but the domain name is down ?

- by Tom

Hi, i created a vps on vps.net and installed CentOS 5.4 x64 LAMP , i choosed the root password and the server start running, i added my domain name in the vps domain section, also i added the two name servers on where i bought the domain name. the problem is that i still can't access the domain, so i think that's because a mistake in the DNS template that is created automatically by the vps provider, here is it : TYPE | NAME | TARGET | MX PRIORITY | ACTIONS ------------------------------------------------------------------- OA @ dns1.vps.net. NS @ dns1.vps.net. NS @ dns2.vps.net. MX @ mail.www.XXXXXXX.com. 10 delete A @ 85.128.137.292 delete A www 85.128.137.292 delete A mail 85.128.137.292 delete A webmail 85.128.137.292 delete A ftp 85.128.137.292 The vps is working fine, & i can access the webmin panel via the ip, so what's wrong with my parameters? Thanks

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Host name resolution on a home network

- by Kris

Hi, I have several machines (both virtual and physical) in my internal network at home. Currently I have to connect via 1P addresses. The one main machine I connect with to all the other machines is running Windows Vista. Is there a way I can have some sort of DNS capability inside my network as well so I can refer to these machines with a name? I think this would be a common problem in most households (running a few computers) and I think there might be some simple solutions out there. This would be something most routers should support out of the box - but why don't they? Can anyone recommend some of these or an easy way to accomplish this?

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Can't make virtual host working

- by sica07

I have to create a virtual host on a server which, previously hosted a single website (domain name). Now I'm trying to add a second domain on this server (using the same nameserver). What I've done so far: Initially there was no virtual host so I've made one for the second domain: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot /var/www/bla ServerName www.blabla.com ServerAlias blabla.com <Directory /var/www/blabla> Order deny,allow Allow from all AllowOverride All </Directory> </VirtualHost *:80> Because nothing happend, I changed the DocumentRoot of the apache server to /var/www (initially was the root document of the first website -/var/www/html) and created a virtual host for the first domain too: <VirtualHost *:80> DocumentRoot /var/www/html ServerName www.first.com ServerAlias first.com <Directory /var/www/html> Order deny,allow Allow from all AllowOverride All </Directory> </VirtualHost *:80> In this case, first.com is working ok, but bla.com not. When I ping blabla.com I get the "unkown host" response. What am I doing wrong? Do I have to modify something in the DNS settings too? Thank you.

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WHM new account nameservers not responding

- by Jae Kun Choi

I've setup a new account in WHM and updated the nameservers from Domain Registrar and it's not responding from the server. So I went to DNS functions and Nameserver IP's and I have the following ns1.example.com.au No IP 4 ns2.example.com.au No IP 4 I'm not sure whether "NO IP" part is the problem I went in to the domains and they seem to be properly set up. Below is what my Domain Registrar responded with my ticket. those nameservers are either a) offline/not responding or b) not set up correctly as nameservers. Is there a place I can check in WHM to make nameservers respond correctly? The nameservers I updated with above ns1.example.com.au and ns2.example.com.au but it's not working. WHM version is: WHM 11.32.2 (build 18)

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multiple wildcard entries

- by Murali

my client has around 300,000 domains and they just have a wildcard for all of them * A 12.12.12.12 Now they want to create a sub domain that points to a different IP and still have the flexibility of wildcard, something like ww1.* A 24.24.24.24 * A 12.12.12.12 Looks like in BIND, the lower "*" is catch-all and taking over every query and hence ww1 is not working. One of solutions offered by IT folks was to create seperate 300K zones for just "ww1" and leave the "*" wildcard. Are there any other DNS software's that can achieve this task easily? Any other ways to deal?

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DHCLIENT.CONF System variables.

- by Dr I

Hello, I've just a little question. My DNS Servers are updated by our DHCP Server (Microsoft Windows 2003 R2 SP2). My clients are Debian Linux Distro's, and I have to modify my DHCLIENT.CONF file on it to send his Full Qualified Hostname. BUT I've about 1600 computers and I don't want to modify each client one by one, then, Could I for exemple use a System Variable on the Config file? Exemple: #DHCLIENT CONF; send "$hostname" where $hostname variable is the alias write on BASHRC for the hostname -f command. If you need any more informations just tell me.

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WAMP Server vs LAMP Server

- by Rob A

Hi All, Just wondering, I want to set up a basic web server at home. I run Windows (XP on the machine to be a server), however I also have Ubuntu on hand if I need to run that. Basically I was wondering if there are any large difference between WAMP servers and LAMP servers? I know the run virtually the same software, but does one perform better than the other? Are there hidden benefits of running it in Ubuntu instead of XP, or the other way around? I know its a basic question, but I havent done anything with Ubuntu, and Ive done about the same amount with web server-ing. Thanks!

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Access to NTP via IP which doesn't change often

- by faulty

I'm trying to sync the clock of our production server located in a data center with pool.ntp.org. For security reason, our servers has no internet access unless we requested to open specific ip/port explicitly. I worked out a list of IPs based on 0.asia.ntp.org 1.asia.ntp.org 2.asia.ntp.org 3.asia.ntp.org Not realizing ntp.org is using round robin DNS and the servers being voluntary, they changes from time to time. In fact the IP I've got from 3.asia.ntp.org last month is no longer working now. I'm wondering if there's a publicly known NTP server that doesn't change as often or if there's a way to go around this without having to request an update to the firewall on a monthly basis. I believe many admin is facing the same issue here.

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Replacing local home server with VPS: Suggestions?

- by CamronBute

So right now, I'm running an old box with a 2TB HDD in it. I use this as a file server for the home network, as well as a box for downloading large files which are synced via Dropbox. Lots of other tinkering things, too. Basically, I'm sick of paying extra for the power and having to worry about drive failures and whatnot. I'd rather get a remote server, let someone else manage it and provide access from the Internet. So, I've been looking for a Windows VPS that would give me access to install things and tinker, and I'm having a problem finding a host that offers more than 100GB of hard drive space. If they do offer a package with 100GB of storage, everything else is waaayyyy more than what I actually need. The idea is to create a permanent VPN connection from the cloud server to my home network to provide a transparent solution so I'm not having to go to lengths to transfer files or whatnot. I think a VPS solution will allow me to do this. I would like 1TB of storage space, minimum 100Mbps Internet connection, minimum 250GB bandwidth, admin access. Anyone have anything? Or am I being unreasonable? If I am, why?

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Domain of sender address does not resolve (in reply to MAIL FROM command)

- by horen

When sending out emails with postfix I sometimes get this error: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command) The domain mydomain.tld is resolvable though, meaning A, MX, PTR records are set properly. However, the sending server does have a different domain anotherdomain.tld but it is allowed to send emails from mydomain.tld since I set the MX records of mydomain.tld to anotherdomain.tld. The envelope from of the problematic emails is [email protected]. Is there some other dns entry I have to set? Or how else could I solve the problem? (I would like to keep the server structure though)

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Using awstats with a round-robin DNS configuration

- by Shaun

I have a website with multiple web servers whose access is controlled via a round-robin DNS. We currently use Google Analytics for site traffic monitoring but were looking to move to awstats due to concerns of inaccuracy with Google Analytics and using third-party trackers in general. I have a little experience with awstats and I know it gets its information from parsing server logs. How would this work when you have multiple web servers logging independently to separate locations? Is this supported with awstats? Is there an alternative I could use to track traffic activity directly on my servers?

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subdomains to different VMs on one IP address

- by efbenson

I have a setup at home with an ESXi server Freenas server and several win7 clients. I have a domain refactoringme.com I set the @ and WWW domain record to my (current) IP address. I then forwarded port 80 to my local win2k3 server on my Linksys router and used host name matching to run the 5 test sites I have. That all works. Now I want to use the turnkey machines and move to dedicated VM servers. One for a wiki one for SVN etc. So how do I get www.refactoringme.com to go to one internal IP address and wiki.refactoringme.com to different internal IP address, while they both use the same external IP address? I added the additional record for wiki to my domain and pointed it to @. I figured it had to be involving a real firewall. So I installed PFSense on a VM and set it on the DMZ on my Linksys. From this point I haven't had any luck. I thought that maybe it would be in the DNS Forwarder or maybe in the Rules sections but neither have worked. Am I doing it wrong or on the right track but am missing something. Thanks for all the help.

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Forward domain for flavors.me yet retain own_domain.com/blog

- by romant

I wish to have my flavors.me use my own domain, yet still wish to retain access to own_domain.com/blog The way flavors.me works now is that I must have the DNS A record point at their IP. Which obviously will prevent me from still having access to own_domain.com/blog Am posting this to gather some ideas. What ought to be the best way of solving this? I am trying to stave off the need for a subdomain for the blog if I can help it. Is there some magic with htaccess and domain masking that can occur without SEO penalties? Thank you.

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Unable To Install SQL Server 2008 On Windows 7 & Windows XP

- by mickburkejnr

Hi Guys, you are my final hope of salvation! For the last five hours I've been trying to install SQL Server 2008, first on Windows 7 and then Windows XP. Both have had the same issue. Even before the installation starts, an error message appears saying: Microsoft .NET Framework 3.5 SP1 installation has failed. SQL Server 2008 Setup requires .NET Framework 3.5 SP1 to be installed. I have installed everything in the hope of getting past this. the service pack it refers to has even been installed and I can see them in the control panel! I have installed Framework 2.0, Framework 2.0 SP1, Framework 3.5, Framework 3.5 SP1, Windows Installer 3.5 and Windows Installer 4.0. Even installed the Service Pack for SQL Server 2008.... But, nothing, works! Does anyone have an idea what I'm doing wrong or what could be wrong? I'm seriously close to the end of my tether, I've even sent Steve Ballmer an email with my frustration. I would seriously appreciate some help with this. Many thanks!

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Hosting multiple sites on a single webapp in tomcat

- by satish

Scenario: I have a website - www.mydomain.com. Registered users will be given the choice of getting a permanent url to their account on mydomain.com as a subdomain like (username.mydomain.com) or they can opt to have their own domain like www.userdomain.com. So the user can access his/her account through the subdomain URL or their own hostname and the request should be forwarded to a specific url on mydomain.com. For example: xyz.mydomain.com or www.xyz.com should give the user account from www.mydomain.com/webapp/account?id=xyz. The user should be completely unaware about where the content is coming from. Setup: My website is running as a webapp in tomcat 5.5.28 with apache as the web server. I am using a VPS which means I have control over all the configuration files (apache, tomcat and dns server). Can you tell me what are the configurations needed to achieve the above scenario??

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MX records and CNAMEs

- by sly

I realize similar questions were asked/answered on this, but I have a subtle detail to which I can not find answers anywhere. Let's exemplify with the following DNS entries: foo.example.com A 1.1.1.1 bar.example.com A 1.1.1.2 wee.example.com CNAME foo.example.com foo.example.com MX foo.example.com.s9a1.psmtp.com bar.example.com MX bar.example.com.s9a1.psmtp.com Note the last line. My institution has that kind of MX records, where for each MX record the value has the label prepended. Question 1 is, what is the motivation for this (why not just s9a1.psmtp.com)? Question 2 is more subtle and follows.. My understanding is that an MX record should not contain any aliases for neither label nor the value, i.e. the following would be bad practice: wee.example.com MX wee.example.com.s9a1.psmtp.com Then, how should the RRs look for the alias wee.example.com? Thanks!

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Windows XP Does Not Follow CNAME Shares

- by user49349

I am supporting a mix of Windows XP Pro and Windows 7 desktops in my Active Directory network, and I am having an odd issue with XP and CNAME records. Say I have a record in my DNS for a server with an A name of something like STORAGE.company.local and give it a CNAME of NAS.company.local. I can go onto an XP and 7 computer, and ping NAS and it will automatically resolve to STORAGE.company.local. If I am on Windows 7 and go to run and enter \\STORAGE or \\NAS, it will go to that server in Explorer. If I do the same in XP, STORAGE will work but NAS will not. It just times out Is there some setting buried in XP to make this work properly?

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Hosting multiple sites on a single webapp in tomcat

- by satish

Scenario: I have a website - www.mydomain.com. Registered users will be given the choice of getting a permanent url to their account on mydomain.com as a subdomain like (username.mydomain.com) or they can opt to have their own domain like www.userdomain.com. So the user can access his/her account through the subdomain URL or their own hostname and the request should be forwarded to a specific url on mydomain.com. For example: xyz.mydomain.com or www.xyz.com should give the user account from www.mydomain.com/webapp/account?id=xyz. The user should be completely unaware about where the content is coming from. Setup: My website is running as a webapp in tomcat 5.5.28 with apache as the web server. I am using a VPS which means I have control over all the configuration files (apache, tomcat and dns server). Can you tell me what are the configurations needed to achieve the above scenario??

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Create 301 Redirection in Amazon Route 53 for Wildcard Subdomains

- by Eric Yin

My domain name hosted on Route 53 DNS. Amazon has a guide to do 301 redirection for www. To naked domain by point www. version to a S3 static website with 301 setted up. My question is, how can I have *.domain.com all have 301 redirec to naked domain name. I guess either: Some way to get all wildcard subdomains end up into one S3 bucket, how? Or: Use CloudFront on the www. version S3 site and put wildcard subdomains on the CloudFront, but how? Or: There's some hidden settings just lies on Router 53, then where? Or: use EC2, better not suggest me this, too costing for this task. Please advice.

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CNAME records query

- by user223346

I have a control panel with Enta which lets me mess with my DNS settings. So i have added a CNAME record to point to an IP address. Assume my website is called: www.example.com I have added a CNAME like this: subdomain.example.com -> This works fine. But now i wish to add another CNAME for the following to point to the same IP: www.subdomain.example.com This is proving to be not possible as it says i cant add "." in the name when i try to create the record? Any help?

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associate dhcp requests with subdomains in dnsmasq

- by Dezra

I have dnsmasq running as a dns server with a number of linux boxes using static ips that run several virtual hosts on subdomains. I currently have the following address line in my dnsmasq.conf to map the subdomain of a boxes address to the boxes static ip: address=/.devbox1.mydomain.com/192.168.1.3 address=/.devbox2.mydomain.com/192.168.1.4 e.g. site1.devbox1.mydomain.com > maps to devbox1 static ip, site1 virtual host site2.devbox1.mydomain.com > maps to devbox1 static ip, site2 virtual host site3.devbox2.mydomain.com > maps to devbox2 static ip, site3 virtual host I was wondering if I can change the machines over to DHCP addresses (instead of static) and have dnsmasq use the dhcp ip instead of the static one? Can I modify the address line to refer to the DHCP address (obviously, I cant hardcode the address)? I know I could add mac address to ip allocation, but I want to avoid this if possible.

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