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• Does DKIM works with subdomains?

  - by Feelsgoodman

  ISP's recommend you segment your marketing and transactional emails by using different IPs. I want to start using DKIM, but since DKIM is a domain based reputation system I wonder if signing with the same company.com domain will impact the reputation of transactional emails, since both them and marketing will be signed with the same domain? Is using DKIM with subdomains possible? Would something like this: bulk.company.com and transactional.company.com be a good idea? Thanks!

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• Connect root domain name to dyndns?

  - by user36175

  Is there any way to connect the root of a domain name to a dyndns account? This question reveals how to get www.whatever.com to point to dyndns, but is there a way to get whatever.com itself to point to it? The domain is registered with GoDaddy if that matters.

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• Is there a method to instantly, dynamically switch between several sets of name servers on a single domain with code?

  - by trnsfrmr

  I usually set name servers at an ISP, they often take 24 - 48 hours to resolve. If one has 2 separate sets of name servers (say from 2 domain parking companies) they want to send traffic to, is it possible to switch between the sets instantly without any delays? To be clear, how do you switch mydomain.com (ns1.nameserver1.com, ns2.nameserver1.com) to mydomain.com (ns1.nameserver2.com, ns2.nameserver2.com) instantly?

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• How does subdomain forward by domain registrar work?

  - by tarasm

  Can you please help me understand how this particular functionality works: I have a domain: example.com, it's registered with GoDaddy. its nameservers are set to linode: ie. ns1.linode.com, ns2.linode.com But at the same time, I can setup a subdomain redirect on GoDaddy and it works. So, I can create a 301 redirect from www. - non www. Can you please tell me how GoDaddy can do this?

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• Does pointing *.[int].mydomain.com to 192.168.1.[int] constitute a security threat

  - by Dave

  For testing purposes, I've found it's really useful to point whatever.machineIP.mydomain.com to 192.168.1.machineIP : that way we can test each other's code without fidgetting with hosts files. I'm aware that this identifies our local IP addresses to the outside world, but if someone could access the network, it'd be trivial to sniff which of the local IP addresses respond to port 80 anyway. Is there anything I'm not seeing? Credit for the idea: http://news.ycombinator.com/item?id=1168896

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• Allowing access to subnets openvpn access server

  - by user3882976

  I have a centos server running a openvpn access server. On that server I am running a windows server in virtual box. On the centos server I am running the vpn with a network address 172.27.224.0 with 20 bits. The windows server is running a dchp server giving ip's of 192.168.1.0-200. When i try to connect to the widows shared folder from the vpn i can't using the name of the server but i can from the ip.

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• PowerDNS 3+ - Recursive queries for subdomains

  - by PDNS Troubles

  We are trying to find functionality in the PDNS 3.x that existed in PDNS < 2.9.2.5. Whereby if we have a domain in the database backend with records, if a query is unable to resolve a subdomain it would then query the recursor setup in the pdns.conf file. We have found that on Centos 6.x the rpm packages are the latest verison of pdns where by 5.x available was pdns-2.9.22-4.el5. The pdns-2.9.22-4.el5 package works as expected but when upgrading servers to Centos 6.x we loose this required functionality. pdns-backend-mysql-2.9.22-4.el5.rpm fails to install on Centos 6.x due to mysql libs that aren't availble, this is caused by an upgrade in the mysql version whereby the pdns backend mysql requires older mysql libs then what is available on centos 6.x . Installing from source is also troublesome with the following errors - http://pastebin.com/B5cUuD08

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• Dynamically updating DNS records with NSUPDATE fails

  - by Thuy

  I've got my own nameserver ns3.epnddns.com and domain epnddns.com I wanted to try and update the records dynamiclly from home using nsupdate but when I run nsupdate -k Kwww.epnddns.com.+157+17183.key i get the following errors Kwww.epnddns.com.+157+17183.key:1: unknown option 'www.epnddns.com.' Kwww.epnddns.com.+157+17183.key:2: unexpected token near end of the file Kwww.epnddns.com.+157+17183.{private,key}: unexpected token Not sure why I get these errors, I'll post my complete setup. Generated keys on my home pc, using dnssec-keygen -a HMAC-MD5 -b 128 -n HOST www.epnddns.com. created /var/named/ and put the keys there and chmod them to 600. transfered the keys to my nameserver ns3.epnddns.com, created /var/named/ ,put the keys there and chmod them to 600 made dnskey.conf in /var/named and added key www.epnddns.com. { algorithm hmac-md5; secret "my secret from they keys=="; }; chmod to 600 then in /etc/bind/named.conf.local include "/var/named/dnskeys.conf"; zone "epnddns.com" { type master; file "/etc/bind/zones/epnddns.com.zone"; allow-transfer { myhomeip; }; //its my home ip so not in the same network allow-update { key www.epnddns.com.; }; }; I restarted bind without any error messages so it seems to be working on the nameserver at least. But on my homepc when i try and run the nsupdate i get those error messages. Thanks in advance for any help or insightful advice.

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• outgoing DNS flood targeted to non-ISP hosts

  - by radudani

  Below is the specific traffic monitored at the network perimeter and originating from a user PC on Vista platform. My question is not about the effects of the flood, but about the nature of the source of it. Is this some known infection, or just an application went out of control? a standard NOD32 scan didn't find anything, as the user told me. Thank you for any hint. 14:40:10.115876 IP 192.168.7.42.4122 > 67.228.0.181.53: S 2742536765:2742536765(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.115943 IP 192.168.7.42.4124 > 67.228.181.207.53: S 3071079888:3071079888(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116015 IP 192.168.7.42.4126 > 67.228.0.181.53: S 3445199428:3445199428(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116086 IP 192.168.7.42.4128 > 67.228.181.207.53: S 2053198691:2053198691(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116154 IP 192.168.7.42.4130 > 67.228.0.181.53: S 2841660872:2841660872(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116222 IP 192.168.7.42.4132 > 67.228.181.207.53: S 3150822465:3150822465(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116290 IP 192.168.7.42.4134 > 67.228.0.181.53: S 1692515021:1692515021(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116358 IP 192.168.7.42.4136 > 67.228.181.207.53: S 3358275919:3358275919(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116430 IP 192.168.7.42.4138 > 67.228.0.181.53: S 930184999:930184999(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116498 IP 192.168.7.42.4140 > 67.228.181.207.53: S 1504984630:1504984630(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116566 IP 192.168.7.42.4142 > 67.228.0.181.53: S 546074424:546074424(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116634 IP 192.168.7.42.4144 > 67.228.181.207.53: S 4241828590:4241828590(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116702 IP 192.168.7.42.4146 > 67.228.0.181.53: S 668634627:668634627(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116769 IP 192.168.7.42.4148 > 67.228.181.207.53: S 3768119461:3768119461(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.117360 IP 192.168.7.42.4111 > 67.228.0.181.53: 12676 op8 Resp12*- [2128q][|domain] 14:40:10.117932 IP 192.168.7.42.4112 > 67.228.181.207.53: 44190 op7 NotAuth*|$ [29103q],[|domain] 14:40:10.118726 IP 192.168.7.42.4113 > 67.228.0.181.53: 49196 inv_q [b2&3=0xeea] [64081q] [28317a] [43054n] [23433au] Type63482 (Class 5889)? M-_^OS>M-JM-m^_M-i.[|domain] 14:40:10.119934 IP 192.168.7.42.4114 > 67.228.181.207.53: 48131 updateMA Resp12$ [43850q],[|domain] 14:40:10.121164 IP 192.168.7.42.4115 > 67.228.0.181.53: 46330 updateM% [b2&3=0x665b] [23691a] [998q] [32406n] [11452au][|domain] 14:40:10.121866 IP 192.168.7.42.4116 > 67.228.181.207.53: 34425 op7 YXRRSet* [39927q][|domain] 14:40:10.123107 IP 192.168.7.42.4117 > 67.228.0.181.53: 56536 notify+ [b2&3=0x27e6] [59761a] [23005q] [33341n] [29705au][|domain] 14:40:10.123961 IP 192.168.7.42.4118 > 67.228.181.207.53: 19323 stat% [b2&3=0x14bb] [32491a] [41925q] [2038n] [5857au][|domain] 14:40:10.132499 IP 192.168.7.42.4119 > 67.228.0.181.53: 50432 updateMA+ [b2&3=0x6bc2] [10733a] [9775q] [46984n] [15261au][|domain] 14:40:10.133394 IP 192.168.7.42.4120 > 67.228.181.207.53: 2171 notify Refused$ [26027q][|domain] 14:40:10.134421 IP 192.168.7.42.4121 > 67.228.0.181.53: 25802 updateM NXDomain*-$ [28641q][|domain] 14:40:10.135392 IP 192.168.7.42.4122 > 67.228.181.207.53: 2073 updateMA+ [b2&3=0x6d0b] [43177a] [54332q] [17736n] [43636au][|domain] 14:40:10.136638 IP 192.168.7.42.4123 > 67.228.0.181.53: 15346 updateD+% [b2&3=0x577a] [61686a] [19106q] [15824n] [37833au] Type28590 (Class 64856)? [|domain] 14:40:10.137265 IP 192.168.7.42.4124 > 67.228.181.207.53: 60761 update+ [b2&3=0x2b66] [43293a] [53922q] [23115n] [11349au][|domain] 14:40:10.148122 IP 192.168.7.42.4125 > 67.228.0.181.53: 3418 op3% [b2&3=0x1a92] [51107a] [60368q] [47777n] [56081au][|domain]

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• Setting alias for DynDNS domain

  - by metalball

  Hey all, I've created DynDNS domain for testing my local sites, and i'm having trouble with pointing to root domain. From my registrar (GoDaddy) I've created a CNAME for www to point my example.dyndns.com so going to url www.example.com I'm reaching my site. But if I'm going to example.com I'm reaching to the IP of the A record. I can't set the IP for the A record to be my IP because I have dynamic IP, and it changes constatly, and I can't point the A record to domain, only IP. When trying to create CNAME record @ to point example.dyndns.com I'm getting error "A record of a different type exists for the hostname @, could not create CNAME" The only record using the '@' host are NS record, which I can't delete, and when tried to set another NS record with @ point to example.dyndns.com, I've lost connection to my site :) So what can I do to get example.com url reach my site? Thanx!

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• Some people suddenly say they cant access my site, but me and all others can

  - by Cain

  I have had this problem many times before and im still unable to find out what is causing it. It happned to me some months ago but it got fixed by itself and had already gone back to normal. Everything was working fine for quite a while until 2 days ago. Some people are reporting they cant access my site, they get a 404 error, however i can access it normally and many other users cant. I dont know whats the common denominator since both groups of people are from the same countries, use the same browsers, OS, etc. so the issue doesnt seem related to that. I have reported this problem before to my both my host and domain registrar but none of them claim responsibility for that. Who is then to blame? Waht can i do to find out whats causing the issue and solve it? Thank you.

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• Is this SPF record correct for me?

  - by DT

  I'm completely new to Stack Overflow, so Hi! I need to add an SPF record to my site "main.com" (not the real address) to allow an email publishing company "emailpublishers.com" (not the real address) to send emails on my behalf. However, I'm nervous about adding an SPF record because of the havoc it could wreak if done incorrectly. I use Google Apps. I also use "auxiliary.com" to send mail from "main.com." And, of course, I use "main.com" to send mail as well. "auxiliary.com" doesn't have an SPF record. I used Microsofts' and OpenSPF's wizards to generate the following SPF entry. Does it seem to be correct for me? "v=spf1 a mx ip4:55.55.555.55 mx:alt1.aspmx.l.google.com mx:alt2.aspmx.l.google.com mx:aspmx.l.google.com mx:aspmx2.googlemail.com mx:aspmx3.googlemail.com mx:aspmx4.googlemail.com mx:aspmx5.googlemail.com a:auxiliary.com include:_spf.google.com include:auxiliary.com mx:auxiliary.com include:emailpublishers.com mx:emailpublishers.com ~all" However, my host MediaTemple says in a knowledge base article to use: v=spf1 a:main.com/20 ~all So that added to my confusion. Thanks a lot!

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• active directory servers synchronization

  - by Mit Naik

  I have 3 AD servers with windows server 2008 R2 at 3 different places, main server is at datacenter and 2 are in our local office which are at 2 different place. I want to synchornize all the 3 server together, were datacenter server should be central server and rest 2 servers should synch with the datacenter server. Please provide us the steps or tutorial to do this. Also we want that once the changes are done in 1 of the AD server the changes are automatically done in all the servers. For example if I change the password of user in our local server it should be updated in our main AD server and other branch server too. Please provide us the steps or tutorial to do this asap. I have one more question I have already created main datacenter AD as domain.local and other domains as xyz.local and abc.local, how can I replicate the additional AD domains with main datacenter DC, also do we require VPN connection, is there any other way to replicate the servers without using VPN connection?

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• Hosting custom domains with IP address flexibility

  - by F21

  I am building a small service where users will be assigned a subdomain such as: myusername.myservice.com anotheruser.myservice.com I know that I can set up a wildcard vhost and using some configuration regex, serve the files like so: myusername.myservice.com ===> /var/www/myusername anotherusername.myservice.com ===> /var/www/anotherusername The problem is that I would like to allow users to alias their own domain names to their service. I understand that for the webserver, once the user adds the domain via my web interface, I can easily create a vhost for the domain in nginx and then refresh the webserver. The problem is that I would prefer to NOT let the users add an A record of my webserver's IP address as I would prefer to keep things flexible (when we upgrade our infrastructure to something more complex to scale). What is the best way to achieve this?

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• Wildcard 'A' record overriding CNAME record

  - by user116890

  I have a Wildcard * A record for self-registration of subdomains by users on our web app. All works fine. I now need to set up an alias for support.mydomain.com to point to mydomain.freshdesk.com. I created a CNAME record as per instructions however it appears my Wildcard A record is overriding the CNAME entry. Any thoughts on how to resolve this? I need the wildcard so creating an A record for each user subdomain is not possible. Thanks.

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• CNTLM issue with intranet (maybe DNS)

  - by htorque

  On my Linux box I need to use an ISA proxy that requires authentication to reach the internet. I therefore installed CNTLM and configured it to point to the proxy address and listen on port 4321. I then configured my GNOME distribution to use localhost:4321 as global proxy for HTTP and HTTPS. The result: I can connect to the internet. I can ping intranet IPs, I do receive name resolution for intranet sites, yet I cannot ping them or open any intranet site in a browser (configured to use the distributions proxy) unless I use the site's IP address. I tried blocking the intranet IP range in the CNTLM config file without luck.

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• nameservers one domain one VPS and one VMCloud

  - by Dave

  I 'had' just a single VPS with nameservers ns1 & ns2.mydomain.com. I've now taken a VMCloud package as I need space etc. Ultimately I will carefully transfer all accounts from my VPS to Cloud but in the short term I'm running both. In the new WHM on Cloud I have set hostname bla.domian nameservers as ns3 & ns4.mydomain.com with the two new ip addresses. Question is do I need to do anything else - eg where mydomain.com is registered? I want ns1 & 2 point to VPS and ns3 & 4 to point to Cloud.

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• My site cant be accessed from certain ISPs

  - by Nuker

  I am on a VPS hosted by a company in Europe. I can access my site normally, many other people i know can as well. However in the recent days i have received reports from many other people that say they cant. They get a timed out request error page. The common denominator seems to be they all have the same ISPs. I have had reports from several different countries such as Spain, Peru, Argentine etc. What can be happening?

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• Google.com always forward me to google.com.hk

  - by Ta Coen

  Any one could help me to figure out why Google.com always forward me to google.com.hk? $ dig google.com www.google.com. 509426 IN CNAME www.l.google.com. www.l.google.com. 100 IN A 74.125.71.147 www.l.google.com. 100 IN A 74.125.71.99 www.l.google.com. 100 IN A 74.125.71.105 www.l.google.com. 100 IN A 74.125.71.106 www.l.google.com. 100 IN A 74.125.71.104 www.l.google.com. 100 IN A 74.125.71.103 and $ dig google.com.hk www.google.com.hk. 261572 IN CNAME www.google.com. www.google.com. 589217 IN CNAME www.l.google.com. www.l.google.com. 139 IN A 74.125.235.17 www.l.google.com. 139 IN A 74.125.235.18 www.l.google.com. 139 IN A 74.125.235.19 www.l.google.com. 139 IN A 74.125.235.20 www.l.google.com. 139 IN A 74.125.235.16 How to make my network always goes to google.com?

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• Visualizing DNS named query logs

  - by romant

  Anyone out has suggestions as to what is available for visualizing logs produced by named?

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• dnssec zonesigner ignoring out-of-zone data

  - by jordi12100

  I am trying to configure DNSSec with BIND9 on CentOS 6.4 running DirectAdmin control panel. I am using this tutorial to make it work: https://www.dnssec-tools.org/wiki/index.php/Zonesigner But I can't get it work... When I run this command: zonesigner --genkeys jordikroon.nl.db jordikroon.nl.db.signed I get this error: jordikroon.nl.db:17: ignoring out-of-zone data (jordikroon.nl) jordikroon.nl.db:18: ignoring out-of-zone data (jordikroon.nl) jordikroon.nl.db:22: ignoring out-of-zone data (jordikroon.nl) jordikroon.nl.db:29: ignoring out-of-zone data (jordikroon.nl) jordikroon.nl.db:33: ignoring out-of-zone data (jordikroon.nl) zone jordikroon.nl.db/IN: has no NS records zone jordikroon.nl.db/IN: not loaded due to errors. I can't find anything on the web about this error. This is my zone db file: $TTL 14400 @ IN SOA ns1.ghservers.org. hostmaster.jordikroon.nl. ( 2013090703 14400 3600 1209600 86400 ) jordikroon.nl. 14400 IN NS ns1.ghservers.org. jordikroon.nl. 14400 IN NS ns2.ghservers.org. cp 14400 IN A 85.17.32.228 ftp 14400 IN A 85.17.32.228 jordikroon.nl. 14400 IN A 85.17.32.228 localhost 14400 IN A 127.0.0.1 mail 14400 IN A 85.17.32.228 pop 14400 IN A 85.17.32.228 smtp 14400 IN A 85.17.32.228 www 14400 IN A 85.17.32.228 jordikroon.nl. 14400 IN MX 10 mail jordikroon.nl. 14400 IN TXT "v=spf1 a mx ip4:85.17.32.228 ~all" localhost 14400 IN AAAA ::1 How do I have to fix this? All IN keywords are being ignored. Any help is welcome:-)

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• I am unable to run a client/server program in php

  - by sibi

  This is the program I am trying to run: $host = "127.0.0.1"; $port = 25003; // don't timeout! set_time_limit(0); // create socket $socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n"); // bind socket to port $result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n"); // start listening for connections $result = socket_listen($socket, 3) or die("Could not set up socket listener\n"); // accept incoming connections // spawn another socket to handle communication $spawn = socket_accept($socket) or die("Could not accept incoming connection\n"); // read client input $input = socket_read($spawn, 1024) or die("Could not read input\n"); // clean up input string $input = trim($input); echo "Client Message : ".$input; // reverse client input and send back $output = strrev($input) . "\n"; socket_write($spawn, $output, strlen ($output)) or die("Could not write output\n"); // close sockets socket_close($spawn); socket_close($socket); I enabled the PHP_socket option in WAMP but still I keep getting errors like unable to bind. Can someone please help me out?

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• Implementation of SSL on SaaS App with seprate domains

  - by asifch

  Hi, We are developing a SaaS application in Asp.net, where we have used the Single application and Per Tenant Database. The application is more like a Saas e-commerce where SSL and data separation are required features. Now we want that every Tenant can have his separate top level domain names instead of the second level domains like 37Signals. So all the domains abc.com and xyz.com are using the same single app. What i need to know is how to implement and deploy the https in the application so that everything works out fine, also how should we configure the NameServer and web application on IIS so that all the domains are pointing to the one application.

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• MX Record for SubDomains

  - by Steve Sloka

  I want to be able to send email to any subdomain I like and not have to configure A records and MX records for each subdomain. Ideally I could send an email to [email protected] and [email protected] and not have to configure anything other than my original domain.com. My current setup: I have a domain (domain.com) and want to have multiple subdomains. (a.domain.com, b.domain.com, c.domain.com, etc). I have an MX record setup to point to domain.com and all email works fine for that domain. I have NOT setup A records for all the subdomains (and really don't want to).

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• CNAME and A record have different TTLs. Which one will be cached?

  - by Sean

  If a CNAME has a TTL of 1 hour that points to an A record with a TTL of 1 minute, will someone who looks up this CNAME have the entire result cached for 1 hour, or will it will keep having to lookup the A record every 1 minute?

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