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• DNSCache excesive memory usage Windows Server 2008 R2

  - by MikeT

  We are having an issue with the dnscache service where its memory usage is becoming excessive (~6GB) after a week or two. Restarting the service frees this memory but performing ipconfig /flushdns does not, an ipconfig /displaydns shows aprox 15-20 entries in the cache. We have checked and there appears to be aprox 150 DNS queries per second taking place but I would not expect this to have the effect of causing this memory issue. I have tried to search MSDN for hotfixes or bug reports but I could only find a reference to a memory leak in windows 2003. can anyone suggest how to proceed.

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• Identify malicious subnet

  - by Macros

  I have been experiencing performance issues on a website for a while, and it always seems to hit around the same time. Having analysed the logs I've found a big spike in requests which corresponds with this slowdown, with all requests coming from the same subnet. It feels to me like an attempt to scrape the site (it is a car hire site and the requests are sequential for each IP and with incremental search criteria) and I would like to identify the source. The Subnet in question is 209.67.89.x which I can see is owned by Savvis however I can't reverse DNS any of the IPs - is there any other way I can gain more info on this (other than contacting them direct - I am also doing this)?

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• Point Subdomain to another application on another domain

  - by Juanu Haedo

  I'm not a very experienced Server Administrator and I'm trying to set up a new one I just got. I'm Using IIS7 and DNS Server What I need is that a url such as: mail.domainA.com points to www.domainB.com/webmail And I want to do this for all other domains... I want all of my domains that start with mail., point to www.domainB.com/webmail In short: I need a Subdomain to redirect to another URL... An improvement would be to let the subdomain as it is on the address bar on the redirection, if possible... Any help?

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• Mirrored servers in data centers nationwide -- how? [closed]

  - by Sysadmin Evstar

  Possible Duplicate: Mirrored servers in data centers nationwide — how? Mirrored servers in data centers nationwide -- how? I flunked my IT interview by getting this question wrong. I thought that in the various metropolitan areas, an "http://google.com" request goes to the ISP's DNS server, which somehow returns an IP address for one of several geographically-nearby http servers, and then something internally rolls over to the next available local Google server. But then, I could not explain where the table of available local Google servers is actually cached, or the details of the IP address rollover. Or how they could manually take some server out of the rotation, from anywhere. So, what should I be reading now so I can ace this question next time? Also, what daemons run on these machines 24/7 to keep all those mirrored database disks synchronized?

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• use local ip and maintain ssl warning free [duplicate]

  - by Timothy Clemans

  This question already has an answer here: Loopback to forwarded Public IP address from local network - Hairpin NAT 6 answers I have a public facing website for a doctor's office for accessing the medical record. I'm using SSL. The server is at the doctor's office. When I access the website on the same network as the server I want the DNS to point to the local IP address. I don't want to do a HTTP redirect to the local ip because of the scary SSL warning. What's the recommended way of doing this?

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• Mac OS X Server DNS Questions

  - by kreativefinally

  Just for a new mac server in the office, initially it was for my personal use as a web development box but now the boss wants me to set it up with all the bells and whistles it comes with. I'm having some issues with the following... Lets just say my business is example.com I want the server's actual address to be labs.example.com and accessible to the world. What do I need to set up at my domain registrar to let the domain know where to go, and what do I need to set up with my hosting company to make this work, and finally what do I need to set up in the server admin panel to get it to work. It seems that DNS not working is first hurdle I need to jump but the documentation around the internet is pretty terrible. Thank you community.

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• Google app engine issue 777 particular solution?

  - by Niklas R

  I use 64.202.189.170 (godaddy) for a HTTP access to a www...on google app engine like GAE issue 777 so that a blank subdomain forwards to www.domain I get the blank to respond by output "This website is temporarily unavailable, please try again later. " There's info about this issue here http://knol.google.com/k/google-apps-discussion-group#view and here http://code.google.com/p/googleappengine/issues/detail?id=777 Since I managed to do it with a .com domain (The godaddy DNS hosted gralumo.com correctly responds to www..) I now want to do it with an off-site DNS managed domain getting the following info about servers: $ ping montao.com.br PING montao.com.br (64.202.189.170) 56(84) bytes of data. 64 bytes from pwfwd-v01.prod.mesa1.secureserver.net (64.202.189.170): icmp_seq=1 ttl=113 time=188 ms 64 bytes from pwfwd-v01.prod.mesa1.secureserver.net (64.202.189.170): icmp_seq=2 ttl=113 time=188 ms ^C --- montao.com.br ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 188.459/188.692/188.926/0.493 ms ubuntu@ubuntu:~$ ping www.montao.com.br PING ghs.l.google.com (74.125.43.121) 56(84) bytes of data. 64 bytes from bw-in-f121.1e100.net (74.125.43.121): icmp_seq=1 ttl=56 time=30.2 ms 64 bytes from bw-in-f121.1e100.net (74.125.43.121): icmp_seq=2 ttl=56 time=28.0 ms 64 bytes from bw-in-f121.1e100.net (74.125.43.121): icmp_seq=3 ttl=56 time=24.2 ms ^C --- ghs.l.google.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2003ms rtt min/avg/max/mdev = 24.201/27.522/30.282/2.514 ms So it looks to me these are the same IP numbers whether or not it's off-site DNS. It's just that it works for one domain and not the other. Could it be just resetting the appspot app ie removing and adding it? Can you recommend how to proceed? Thanks in advance

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• DD-WRT: DNSMasq expand-hosts not working

  - by Craig Walker

  I have a Linksys router running DD-WRT (Firmware: DD-WRT v24-sp2 (09/08/09) mini). I have it successfully resolving the DNS names for my DHCP-assigned systems, but only when I fully-qualify those domains. This is despite using the "expand-hosts" DNSMasq additional option, which is supposed to activate this precise function. Here's my dnsmasq.conf: interface=br0 resolv-file=/tmp/resolv.dnsmasq domain=example.com dhcp-leasefile=/tmp/dnsmasq.leases dhcp-lease-max=51 dhcp-option=lan,3,10.77.0.5 dhcp-authoritative dhcp-range=lan,10.77.0.100,10.77.0.149,255.255.0.0,1440m dhcp-host=00:1A:A0:1D:82:5A,astatichostname,10.77.1.40,infinite expand-hosts (FYI: example.com and astatichostname are placeholders for the real-deal names I use. My network uses 10.77.0.0/16; my router is on 10.77.0.5.) Results: > nslookup astatichostname 10.77.0.5 Server: 10.77.0.5 Address: 10.77.0.5#53 ** server can't find astatichostname: NXDOMAIN > nslookup astatichostname.example.com 10.77.0.5 Server: 10.77.0.5 Address: 10.77.0.5#53 Name: astatichostname.example.com Address: 10.77.1.40 Is there something else that could be tripping up expand-host in DNSMasq?

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• Using dnsmasq for accessing multiple nameservers assigned by DHCP

  - by Ash

  At my work desktop running openSUSE 11.4, I have a local network which gets its address, domain (work.site) and nameservers (10.100.1.1, 10.100.1.2) info through DHCP - which get written into /etc/resolv.conf I get to access the internet using the work network, and these 2 nameservers end up returning the entries for any public domain name lookups on the internet. I also have a private VPN that I end up connecting. The nameserver (10.111.1.1) and domain (private.site) are rarely bound to change for this network, but currently they're pushed by the openVPN client into networkmanager, and which also gets merged with the existing /etc/resolv.conf My resolv.conf ultimately ends up looking like this: search private.site work.site nameserver 127.0.0.1 nameserver 10.111.1.1 nameserver 10.100.1.1 As you can see the 2nd nameserver from my work network was pushed out because of the max 3 entry limitations. It is fine still, but would be a problem if that nameserver goes down for maintenance or something. So I found out that dnsmasq could help me here, and hence I setup dnsmasq just as a local DNS resolver without any DHCP support. So right now this is my /etc/dnsmasq.conf: resolv-file=/etc/resolv.conf server=/private.site/10.111.1.1 server=/1.111.10.in-addr.arpa/10.111.1.1 listen-address=127.0.0.1 bind-interfaces log-queries I've made dnsmasq get the list of nameservers from /etc/resolv.conf since NetworkManager seems to be updating this list correctly (for a max of 3 nameservers). I'm able to resolve the host names in both the networks correctly. So these are the questions I have: Is there a way I can make either NetworkManager or dhclient write out the list of nameservers somewhere else which I can make dnsmasq use as resolv-file ? How do I make dnsmasq use certain nameservers as the default for all queries ? Right now I notice that lookups for public domains on the internet are usually sent to both the nameservers - the one on work.site as well as private.site. It would be good if I can limit this only to work.site.

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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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• Bind9 zone files

  - by user42780

  Well for the better part of the last two hours I've tried to figure out what is actually wrong, but I can't seem to find anything obvious to me. What I'm trying to do is setup my DNS for say(per example) domain.com. This should include two NS records, namely ns1.domain.com and ns2.domain.com. With that there should be a mail record, as well as a CNAME record for www. I've been trough roughly 20 how to's in the last two hours, rewrote everything from scratch four times and I still can't seem to find whats wrong. My only suspicion to this might be two things; the error I get from the bind9 daemon when I stop the service, and the named.conf file. The error I get from the bind9 daemon when stopping the service is: * Stopping domain name service... bind9 rndc: connection to remote host closed This may indicate that * the remote server is using an older version of the command protocol, * this host is not authorized to connect, * the clocks are not syncronized, or * the key is invalid. I honestly doesn't know what this means, apart from the key defined in /etc/bind/rndc.key that's not in the named.conf file(yes, I did try to add it to no avail). Here's all the zone files, and configuration files; http://208.77.101.5/bind9/ If anyone could help, it would be greatly appreciated.

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• Active Directory Domain Services - Network Name Cannot be Found

  - by Arief

  I have really weird problem that I could not explain. I am trying to redirect all users home folder to the new server. I have copied all the files including the permissions to the new server. All I need to do is to update the user profile for home folder by changing the server name. However, I got this message when I enter the new server name: My server that serving as AD can resolve the name by ping and nslookup of the server name. The only thing that I don't understand why the MMC cannot resolve the name. I did change with the IP Address and I still get the same error message. Thank you so much for your help. UPDATE: I know what seems to be a problem, but I don't know how to fix it. The new server that will serve all Home folder is actually sitting in the cloud with different IP Address as the Domain Controller. The Domain Controller is sitting locally in the office with 10.0.0.0/24 IP Addresses. The new server that is sitting in on Data Centre is on 172.10.10.10/24 IP Addresses. The static route has been set up on both end, and the DNS as well. I believe this is the issue. Does anyone how to overcome this situation? Thank you.

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• Trouble serving vhosts when trying to set up wildcard subdomains with dnsmasq in local development e

  - by Jeremy Kendall

  I'm trying to get wildcard DNS enabled on my laptop using dnsmasq. I realize that this has been asked and answered more than once on this forum, but I can't get the solution to work for me. Steps taken so far: Installed dnsmasq Set address=/example.dev/127.0.0.1 in dnsmasq.conf Set listen-address=127.0.0.1 in dnsmasq.conf Ensured nameserver 127.0.0.1 is in /etc/resolv.conf Set prepend domain-name-servers 127.0.0.1; in /etc/dhcp3/dhclient.conf Created a vhost for example.dev Restarted apache and dnsmasq Note: example.dev is not set in /etc/hosts My vhost for example.dev <VirtualHost *:80> ServerName example.dev DocumentRoot /home/jkendall/public_html/example/public ServerAlias *.example.dev # This should be omitted in the production environment SetEnv APPLICATION_ENV development <Directory /home/jkendall/public_html/example/public> DirectoryIndex index.php AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost> The setup above will server example.dev locally without any problem. It will also serve test.example.dev, but test.example.dev returns the default apache "It works!" index.html from /var/www rather than my index.php in /home/jkendall/public_html/example/public. The solution in this Server Fault thread suggests that address=/.example.dev/127.0.0.1 would resolve my problem, but when I try to use that solution, restarting dnsmasq results in a failure with the error message dnsmasq: error at line 62 of /etc/dnsmasq.conf For grins, I moved my project over to /var/www/example and modified the vhost appropriately. I got the same result as described above. At this point I'm not sure what other steps I can take to resolve the issue. Thoughts?

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• Running multiple services on different servers with IPv6 and a FQDN

  - by Mark Henderson

  One of the things NAT has permitted us to do in the past decade is split physical services onto different servers whilst hiding behind a single interface. For example, I have example.com behind a NAT on 192.0.2.10. I port-forward :80 and :443 to my web server. I'm also port forward :25 to my mail server, and :3389 to a terminal server and :8080 to the web interface of my computer that downloads torrents, and the story goes on. So I have 5 port forwardings going to 4 different computers on example.com. Then, I go and get me some neat IPv6. I assign example.com an IPv6 address of 2001:db8:88:200::10. That's great for my websites, but I want to go to example.com:8080 to get to my torrents, or example:3389 to log on to my terminal server. How can I do this with IPv6, as there is no NAT. Sure, I could create a bunch of new DNS entries for each new service, but then I have to update all my clients who are used to just typing example.com to get to either the website or the terminal server. My users are dumber than two bricks so they won't remember to connect to rdp.example.com. What options do I have for keeping NAT-style functionality with IPv6? In case you haven't figured it out, the above scenario is not a real scenario for me, or perhaps anyone yet, but it's bound to happen eventually. You know, with devops and all.

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• IIS8 behind a VPN + Windows Server 2012 - how to properly bind IP+Port

  - by ryugen

  This is my first question so I hope I'm going to give you enough information. I'm running Windows Server 2012 within the Hyper-V environment of my Windows 8 machine. Within Windows Server 2012 I'm running a VPN tool based on openVPN to hide my real IP. When I run IIS8 with the VPN disconnected it works flawlessly through the Internet (port 80 forwarded correctly). But as soon as I connect to the VPN I can't reach my site through the domain anymore. Now I tried basically everything I know which is why I'm asking you guys. I tried binding IIS8 to the IP of my virtual ethernet card. I tried changing the priority of the NIC through the "Network and sharing center" via the advanced tab. I used ipconfig /flushdns in case there was something wrong in the DNS handling. Hell, I even turned off the Windows firewall. I also used a port scanner to verify the problem. The webserver is reachable on port 80 with VPN disconnected and immediately gets unreachable on connect. Theoretically both IPs (my regular one AND the VPN) should be reachable or at least not impair the other one right? Do you have any other suggestion? Do I have to route something somewhere somehow?

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• nameserver spoiling avahi multicast name resolution of .local domain

  - by Doug Coburn

  After trying to ping a machine on my local network, I noticed that I was trying hit address 66.152.109.24. This is an external public address. Resolution should have occurred via avahi mDNS. I ran dig to see how the name resolution worked and my quest/centurylink name server was retuning results for my .local domain queries! I tried a random name and got the same ip address result. $ dig jakdafj.local ; <<>> DiG 9.8.1-P1-RedHat-9.8.1-3.P1.fc15 <<>> jakdafj.local ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58410 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;jakdafj.local. IN A ;; ANSWER SECTION: jakdafj.local. 10 IN A 66.152.109.24 jakdafj.local. 10 IN A 204.232.231.46 ;; Query time: 104 msec ;; SERVER: 205.171.3.25#53(205.171.3.25) ;; WHEN: Sat Mar 24 20:40:17 2012 ;; MSG SIZE rcvd: 63 Am I missing something or is my DNS name server at 205.171.3.25 corrupted?

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• Connecting to RDS database from EC2 instance using bind9 CNAME alias

  - by mptre

  I'm trying to get internal DNS up and running on a EC2 instance. The main goal is to be able to define CNAME aliases for other AWS services. For example: Instead of using the RDS endpoint, which might change over time, an alias mysql.company.int can be used instead. I'm using bind9 and here's my config files: /etc/bind/named.conf.local zone "company.int" { type master; file "/etc/bind/db.company.int"; }; /etc/bind/db.company.int ; $TTL 3600 @ IN SOA company.int. company.localhost. ( 20120617 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; @ IN NS company.int. @ IN A 127.0.0.1 @ IN AAAA ::1 ; CNAME mysql IN CNAME xxxx.eu-west-1.rds.amazonaws.com. The dig command ensures me my alias is working as excepted: $ dig mysql.company.int ... ;; ANSWER SECTION: mysql.company.int. 3600 IN CNAME xxxx.eu-west-1.rds.amazonaws.com. xxxx.eu-west-1.rds.amazonaws.com. 60 IN CNAME ec2-yyy-yy-yy-yyy.eu-west-1.compute.amazonaws.com. ec2-yyy-yy-yy-yyy.eu-west-1.compute.amazonaws.com. 589575 IN A zzz.zz.zz.zzz ... As far as I can understand a reverse zone isn't needed for a simple CNAME alias. However when I try to connect to MySQL using my newly created alias the operation is giving me a timeout. $ mysql -uuser -ppassword -hmysql.company.int ERROR 2003 (HY000): Can't connect to MySQL server on 'mysql.company.int' (110) Any ideas? Thanks in advantage!

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• Emails going to Junk for Hotmail recipients

  - by David George

  We send daily mass emails to our customers (~30,000+ emails per day). We have problems with Hotmail users receiving our emails. Sometimes the email goes to the Junk folder, but often it will got to their inbox, but the content is blocked so the user sees a message saying "This email was blocked and may be dangerous". If an email is sent to GMAIL it is usually not blocked, but it does show up as from "Uknown" instead of the company. Please be advised I've done the following: 1. No RBLs Checked on - http://multirbl.valli.org/ 2. We do have SPF records published 3. We do have reverse DNS setup 4. Our company even signed up for the Junk Mail Reports Program at Hotmail Here is a sample header, I've noticed the X-SID-Result and the X-AUTH-Result both FAIL every time at Hotmail: X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MTtTQ0w9MQ== X-Message-Status: n:0 X-SID-Result: Fail X-AUTH-Result: FAIL X-Message-Info: JGTYoYF78jFqAaC29fBlDlD/ZI36+S6WoFmkQN10UxWFe1xLHhP+rDthGRZM87uHYM926hUBS+s0q46Yx9y6jdurhN6fx0bK Received: from privatecompany.com ([WanIPAddress]) by col0-mc3-f30.Col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Wed, 5 May 2010 08:41:27 -0700 X-AuditID: ac10fe93-000013bc00000534-46-4be191a1618e Received: from INTERNAL-Email-SERVER([InternalIPAddress]) by privatecompany.com with Microsoft SMTPSVC(6.0.3790.4675); Wed, 5 May 2010 11:41:21 -0400 From: Private Company, Inc.<[email protected]> To: [email protected] Message-Id: <[email protected]> Subject: Date: Wed, 5 May 2010 11:42:46 -0400 MIME-Version: 1.0 Reply-To: [email protected] Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: AAAAAA== Return-Path: [email protected] X-OriginalArrivalTime: 05 May 2010 15:41:27.0837 (UTC) FILETIME=[6D06E4D0:01CAEC69]

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• Domain registrar transfering

  - by Mike Weerasinghe

  In 2004 I registered a domain name when I opened an account with DiscountASP.NET. I presume my domain registration was handled by a reseller. A domain tools who is search shows that registration services are provided by Znode LLC. I changed hosting companies and need to change DNS servers to point to my new hosting company but I have no idea how to do that. There is no control panel I can access. Ideally I would like to transfer registrar's. I emailed Znode support but I have not received any response. I called and left a message and they have not called back. My new hosting company wants an EPP authorization code in order to transfer my domain. I guess I need to get it from Znode LLC. Anyone have any ideas on how I might go about transferring my domain over to a new registrar? The domain name has not expired and is currently active. Thanks in advance for your help.

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• bind9 dlz/mysql at ubuntu segfault libmysqlclient.so

  - by Theos

  I have a big problem. I installed the bind9 nameserver to three different computer. two Ubuntu 10.04.4 LTS, and one Ubuntu 11.10 I compiled it 9.7.0, 9.7.3, 9.9.0 with this method: ./configure --prefix=/usr --sysconfdir=/etc/bind --localstatedir=/var \ --mandir=/usr/share/man --infodir=/usr/share/info \ --enable-threads --enable-largefile --with-libtool --enable-shared --enable-static \ --with-openssl=/usr --with-gssapi=/usr --with-gnu-ld \ --with-dlz-mysql=yes --with-dlz-bdb=no \ --with-dlz-filesystem=yes --with-geoip=/usr make make install After the set up for dlz/mysql, the BIND server is working perfetctly until 5-30 minute long. Ahter i got segfault. I resolve temporaly the problem with a simple process watchdog, and if the named is stopped, the watchdog is restart it, but this is not a good idea in long therm. My log output is: messages: Apr 13 19:33:51 dnsvm kernel: [ 8.088696] eth0: link up Apr 13 19:33:58 WATCHDOG: named not running. Restarting Apr 13 19:35:08 dnsvm kernel: [ 87.082572] named[1027]: segfault at 88 ip b71c4291 sp b5adfe30 error 4 in libmysqlclient.so.16.0.0[b714e000+1aa000] Apr 13 19:35:08 WATCHDOG: named not running. Restarting Apr 13 19:35:08 dnsvm kernel: [ 87.457510] named[1423]: segfault at 68 ip b71d6122 sp b52f0a40 error 4 in libmysqlclient.so.16.0.0[b7160000+1aa000] Apr 13 19:35:09 WATCHDOG: named not running. Restarting Apr 13 19:41:56 dnsvm kernel: [ 494.838206] named[1448]: segfault at 88 ip b731c291 sp b5436e30 error 4 in libmysqlclient.so.16.0.0[b72a6000+1aa000] Apr 13 19:41:57 WATCHDOG: named not running. Restarting Apr 13 19:57:26 dnsvm kernel: [ 1424.023409] named[2976]: segfault at 88 ip b72d1291 sp b6beee30 error 4 in libmysqlclient.so.16.0.0[b725b000+1aa000] Apr 13 19:57:26 WATCHDOG: named not running. Restarting Apr 13 20:11:56 dnsvm kernel: [ 2294.324663] named[6441]: segfault at 88 ip b7357291 sp b6473e30 error 4 in libmysqlclient.so.16.0.0[b72e1000+1aa000] Apr 13 20:11:57 WATCHDOG: named not running. Restarting syslog: http://pastebin.com/hjUyt8gN the first server is a native, normal x64 server (u1004lts), the second is virtualised server (u11.10) the third is also virtualised (10.04lts) This servers is only for dns providing with mysql server db. But the problem is be with all server, and all bind version. named.conf: http://pastebin.com/zwm1yP7V Can anybody help me, or any good idea?

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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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• Intermittent CNAME forwarding

  - by Godric Seer

  I host a personal website on an old desktop that is LAMP based. Since I have a dynamic IP, I use no-ip to make sure I have a working domain name at all times. I also have a domain I have bought on GoDaddy where I have a CNAME record forwarding the www subdomain to my no-ip domain. At all times, I can connect to my website through the no-ip domain without issue. For the past several weeks, I never had an issue using the GoDaddy domain to connect (ssh or https). As of today, however, the GoDaddy domain only works for about 10 minutes at a time. I get server not found errors most of the time. Also, if I happen to be using the GoDaddy domain for an ssh connection, the connection will freeze. I have attempted to run tests using a couple of online DNS check websites, but have not gotten any errors at any time. I also contacted GoDaddy support but they had no issues connecting to the website, and therefore did not see any issues. I would like advice on how I could debug/resolve this issue. Since the problem appeared without me changing anything on my end, I hope it will resolve itself, but knowing the cause in case it happens again would be preferable. EDIT: I changed the configuration in GoDaddy to create an A (Host) that points at my current IP. This works fine, so I can access the site through the GoDaddy domain without the preceding www. I am currently waiting for a new CNAME record to propagate that points the www subdomain at the main host, rather than my no-ip domain.

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• SPF record for Gmail?

  - by Chris

  I have DNS, with a SPF TXT record, configured for a domain name. The primary user of the domain name now needs to be able to send both from our SMTP servers, and also from her GMail account. I've seen all the information about adding "include:_spf.google.com" to the SPF TXT record, but, as I look into it, it appears that record is outdated. In particular, I had the user send me a test message, and note that it was: Received: from mail-la0-f50.google.com (mail-la0-f50.google.com [209.85.215.50]) However, _spf.google.com doesn't list that IP address: $ dig +short _spf.google.com txt "v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ?all" (Note that a 209.85.21*8*.0 network is listed, but not 209.85.21*5*.0.) Is there a better way to enable sending from GMail? This user sends to at least one recipient with a strict SPF policy that bounces mail not from a designated host... Many thanks!

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• Setting up Red Hat Enterprise Linux Server as a mail exchange server

  - by Syedur

  I am a Unix/Linux/Windows Server noob. So, keep that in mind before you throw your stones at my glass house. :P I have a Windows Server 2008 R2 machine that's acting as domain controller, Server A. It's also running a DNS server. I have a Red Hat Enterprise Linux Server 5.3, Server B that is intended for mail server. In order for the mail delivery to happen, I understand that I have to set an MX record on Server A and point it to Server B. Well, I did. I manually added a host name on Server A and pointed to Server B's IP address. Then I added an MX record and pointed it to the host name. That didn't do the trick. After taking the above steps, I used the "dig" command on Server B to lookup the MX record coming back from Server A and it wasn't what I was expecting. What am I doing wrong here? I have noticed that... my Windows machines that are joined to the domain (Server A) are listed under the host names. The machines that are not joined to the domain are not list. This is fine, I am not worried about this. What does concern me, do I have to join the Server B to domain in order for Server A to recognize as a valid host and forward the MX properly? If so, some simple steps on how to join Server B to the domain would also help.

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• What is the correct mail set up for multiple domains on one server?

  - by newmarc

  I have a machine (centos 5) with one external ip address. On that machine I have many virtual hosts with a few different top level domain names and sub-domains under those eg. sub1.domain1.com sub2.domain1.com sub3.domain1.com sub1.domain2.com sub2.domain2.com sub1.domain3.com And so on... Alot of these different sites need to send mail as their corresponding domain (or second-level domain at least). I need to set up DKIM, SPF (but that's handled on the DNS) and rDNS lookup so the mail gets received. As I understand it, you can only have one rDNS entry per machine. I could set up a server for each top level domain, but I'm thinking that'll get expensive. What should I do here? Is there a way to have multiple rDNS lookups on one ip address? How do I setup DKIM signing for multiple domain names on the one machine? Are there any services out there that could handle this for me? Thanks for your help...

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