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• Finding all domain names that resolve to the same ip?

  - by Janak

  Lately I've been tracking a spammer on craigslist. I recently discovered that he's added a new technique to his arsenal, he registered a whole bunch of domain names but they all resolve to the same ip address. Is there any way to take an ip address and get a list of all the domain names that resolve to that ip?

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• Windows Server 2008 R2 DNS - One IP, multiple servers

  - by Blu Dragon

  I need opinions and examples on how to best to accomplish the setup I am looking for. I have a public-facing AD domain server with one public IP address. I have setup an external zone for example.com and I successfully have my own name servers pointing to it at ns0.example.com and ns1.example.com. I also have an internal zone for my private network at home.example.com. I am behind a router with the domain server in the DMZ. I want dev.example.com to be accessible from the outside world over https and to point to internal IP address 192.168.1.78. Likewise, I want www.example.com to be accessible from the outside world and point to internal IP address 192.168.1.79. Both dev and www servers are CentOS 5.6 VMs running inside of Hyper-V on the domain server (bad idea I know but I am limited on hardware atm). What is best way to achieve this? From what I have read and researched on Google, I may need to setup a reverse proxy but I am not sure how well that will work with SSL.

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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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• How to you create a wildcard DNS entry in Mac OS X 10.6 Server DNS GUI?

  - by Chris Altman

  The GUI does not accept "*". How, through the GUI, do I create a wildcard subdomain?

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• named-checkzone reports 'ns.example.com.ns' has no address records (A or AAAA)

  - by hydroparadise

  The first thing I see wrong is that its a recursion problem. But I'm not sure where the problems lie in my reverse lookup file. ns should report back as ns.example.com but instead getting ns.example.com.ns. Of course it wouldn't find any entries for that name because there isn't one, nor is it supposed to. Here's my reverse file: $TTL 86400 @ IN SOA ns.example.com root.example.com. ( 16071990 ; Serial 3600 ; Refresh 1800 ; Retry 604800 ; Expire 86400 ; Minimum TTL ) @ IN NS ns.example.com It's not extraordinarily complicated. What my question is, what other files affect the output for named-checkzone when checking a name against the revers file?

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• DNS server failure when forwarding

  - by Abraham Katz

  I run Bind 9 on a Ubuntu 12.04 server. I want this server to be a sort of a "wrapper" over my default server, so that it will respond to "domain_name.My_TLD" itself and forward requests to any other request. The server resides in a domain (Disconnected from the internet), so I configured it to zone "company_domain."{ type forward; forwarders { 1.2.3.4 }; #the DC's ip }; When i query it about sommething.company_domain. it sends a query to the DC and gets a response, but it returns "server failure". What can cause that? Cheers, Abraham

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• DNS zone file SPF configuration to support sending mail from multiple servers and gmail

  - by Tauren

  I want to configure SPF on a domain to allow mail to be sent from: the x.com website server (x.com and www.x.com - both at same IP) it's MX servers (smtp.x.com, mx.x.com, mail.x.com) another server that isn't listed as an MX server (somehost.x.com) via gmail using an account that has authenticated use of [email protected] Will this zone file work? If not, what are the problems with it? $ttl 38400 @ IN SOA ns1.x.com. hostmaster.x.com. ( 201003092 ; serial 8H ; refresh 15M ; retry 1W ; expire 1H ) ; minimum @ NS ns1.x.com. @ NS ns2.x.com. @ MX 10 mx.x.com. @ MX 20 smtp.x.com. @ MX 30 mailhost.x.com. ; SPF records @ IN TXT "v=spf1 a mx a:somehost.x.com include:_spf.google.com ~all" mx IN TXT "v=spf1 a -all" smtp IN TXT "v=spf1 a -all" mailhost IN TXT "v=spf1 a -all" Questions: Is _spf.google.com the right thing to include for gmail.com, or is it only for Google Hosted Apps? If only for Google Apps, what should I include to send from gmail.com? If mail shouldn't be sent from anywhere else, is it safe to use -all instead of ~all? Does it make sense to add specific SPF records for each of the mail servers? Any other problems with the zone file? I want to confirm these things before making changes to my zone file. The file has SPF configured basically the same now, just without google.com and somehost, but I want to make sure I won't break things when I change it.

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• DNS with Amazon EC2 Elastic Load Balancer

  - by user68173

  I'm told that I can't make the root of a domain (example.com) a CNAME - I have to specify an IP. Given that you can't use an IP address to point at your Elastic Load Balancer, what's the best thing to do? Currently I do this: example.com - A record to elastic IP of first server- redirects to www.example.com www.example.com CNAME to hostname of load balancer If the first server is out of action, the redirect will fail. Is there a better way to approach this?

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• Dreamhost DNS CNAMEs work at my house, not for anyone else

  - by unknown (google)

  I have my domain BQQKSHELF.COM that I bought through Dreamhost. I set up a CNAME so that zach.bqqkshelf.com points to my app at zach.heroku.com. The app at Heroku is working fine. Everyone can agree on that. When I go to zach.bqqkshelf.com, everything seems to work okay too. When I ask my roommate to go to it, it works. When I go to it on my iTouch, it works. When I IM my friends and ask them to go to zach.bqqkshelf.com, they get a time out error. How is this possible?

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• Multi-IP address zimbra server DNS PTR records and spam

  - by David Fraser

  We have a mail server running Zimbra (ZCS 6.0.8). The server has 5 active public IP addresses in the same subnet. (.226-.230). I currently have A records for each of these (host0.domain.com..host4.domain.com), with the main host.domain.com of the machine pointing to .226. Our host has ended up being listed on the SORBS DUHL list (even though it's in a server farm). According to them you can get removed quickly by checking that your host has an MX record, an A record, and a PTR record that points back to the hostname given in the MX record. I tried setting the PTR records so that each of these addresses resolved back to their A record (i.e. .228 had a PTR to host2.domain.com). However, I then got mail being rejected from other servers because when Postfix (under Zimbra control) sends out mail, it uses the main hostname for the HELO - there doesn't seem to be any way to override it. So the PTR records currently say host.domain.com for all 5 IP addresses. What's the correct way to handle this? Should I have an A record for the domain that points to all the IP addresses (for round-robin handling)? I'm nervous of changes that could cause problems, so I'm wondering what the standard way to handle a multiple-IP-address mail server is.

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• DNS resolution not working on Browsers but on Shell

  - by Shyam Sunder Verma

  Running dig/ping on any domain, give me correct ip. When I try to browse google.com in browser it does not work. When I pick the IP (via ping) and use it in browser, website open via IP fine. But further work does not work, because of name resolution problem. DO NOT works fine on : Ubuntu 9.10 installed in Virtual Box over Windows. Ubuntu 10.10 installed in Virtual Box over Windows. Ubuntu 9.10 installed on laptop. But Internet works fine on windows vista installed on laptop.

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• DNS CNAME - SSL-certificate issue.

  - by Phoibe

  Hey, I have obtained an SSL certificate by Thawte for domain.com Now my infrastructure changed due to heavy load I have mx.domain.com as SMTP relay storage.domain.com as Mail-Storage and domain.com pointing at Web-Server Every server is hosted on another dedicated/virtual server with individual IP. I do not want to put the Web-Server on the Mail-Storage for security reasons but I do want to use my SSL-Certificate for the Mail-Storage(POP3S/IMAPS). Is that possible or how do I solve that issue?

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• Is Zoneedit reliable for DNS?

  - by Alex

  It's been around forever, right?

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• Using Round Robin DNS on simple VPN setup

  - by dannymcc

  We have two internet connections which are load balanced to share the load between the two. We set this up after one of the internet provider proved to be less than reliable but great speed and latency wise when it is working. We'd rather utilise both connections as much as possible rather than leave one idle until the other drops out. We have a number of remote workers who occasionally need to connect via VPN from their laptops or iPads, we also have a small number of permanent LAN to LAN tunnels running from smaller branches. Originally we only had one internet connection and used one of our static IP addresses for all VPN users. Now that we have two internet connections running all of the time I am trying to make sure that the VPN is available to our team regardless of which connection drops. So my solution is to create two A records for our domain name with a value of vpn. and the two static IP addresses from each peer. Is this a sensible way of achieving this? Should I expect higher latency due to packets being lost if one peer fails and some packets still get routed to it anyway? A brief mockup of the setup I have:

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• Problem with ping/DNS

  - by bublegumm

  When I am pinging non-existing host like 'zzz' or 'qwerty' I am getting the following result Pinging zzz.kanisa.com [209.62.20.200] with 32 bytes of data: Reply from 209.62.20.200: bytes=32 time=60ms TTL=46 Reply from 209.62.20.200: bytes=32 time=66ms TTL=46 It looks like a virus to me. But I was unable to find a solution on web. Any ideas how to fix it?

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• DNS on Redhat - rdnc: no server specified and no default

  - by Syahmul Aziz

  Hi all. The error as shown in the 2 pictures below: The configurations for named.conf and the zones files as shown below: After applying "alveso" suggestion below. Now, I think there is no error but I still can't ping my own domain www.p0864868.com (10.0.0.1) nor can I do host or nslookup as shown on previous pictures. PLease assist. Thank you in advance. I also attached my the changes that I made to my named.conf as well as my resolve.conf configs as shown below: progress 2: turned on logging by typping "rndc queylog" The output as below when I pinged p0864868.com progress 3: changed permission of 10-0-0.zone and p086868.zone to 644 named:named Still can't ping www.p0864868.com or execute host command. It says something like network unreachable. I don't understand why it refer to I don't what address is that.

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• tomcat dns forwarding to multiple applications

  - by basis vasis

  I recently installed business objects software on tomcat 6. I have 2 domains - domain1 and domain2. This software allows access to two of its applications via these URLS: ADDRESS:http://myservername.domain1:8080/BO/APP1 and ADDRESS:http://myservername.domain1:8080/BO/APP2. Instead of these urls, I would like the end users to access these apps via something like http://bobj.domain2.com:8080/BO/APP1 and http://bobj.domain2.com:8080/BO/APP2. I cannot figure out how to accomplish that. I have looked into the option of http redirect (not good because the destination address shows up in the address bar), domain forwarding (not sure if it would work with multiple applications and forwarding from one domain to another) and also using apache tomcat with mod_jk by using virtual hosts (not sure if it is possible when forwarding from one domain to a sub domain in another domain) ?? please advise as to what would be my best option and how to accomplish. thanks a bunch

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• DNS Name lookup (was SSH) Not Working After Snow Leopard Upgrade

  - by petercardona

  I think this started with the Snow Leopard update. Cleaned out the .ssh directory, still having the issue. ~: uname -a Darwin california-example-com.local 10.0.0 Darwin Kernel Version 10.0.0: Fri Jul 31 22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_I386 i386 ~: ssh -V OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009 ~: ls -l ~/.ssh ~: nslookup nevada Server: 10.94.62.3 Address: 10.94.62.3#53 Name: nevada.example.com Address: 10.94.62.3 ~: ssh nevada ssh: Could not resolve hostname nevada: nodename nor servname provided, or not known

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• Custom hostname instead ISP's

  - by JohnZ

  Hi! I have setup a Centos 5.5 server and a domain name (say mydomain.com) pointing to it (using bind9) with custom nameservers (like ns1.mydomain.com and ns2.mydomain.com). Everything works fine but there is something more I would like to have and don't know if it is possible. Is it possible to have the returned host to be mydomain.com (PHP gethostbyaddr()), not host-static-x-y-a-b.myisp-provider.com? And how do I implement it if it's possible?

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• DNS Problems with .me domain

  - by tchaymore

  I recently registered a .me domain through GoDaddy. I set the nameservers to my slicehost servers immediately, and that change has been reflected in the .me WHOIS since day one. However, after almost two weeks, still can't look up the site. Is there something specific to .me domains or slicehost that I'm missing?

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• question about dns

  - by manohara

  how to add multiple domainnames in named.conf file for both forward and reverse lookup zones

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• Help setting up a dns nameserver for parking domains

  - by Chev

  Hi There I need to be able to create name server entries for new domains being registered and need some help in setting up a name server on the internet. I am looking for some good resources - prefereably with a windows machine. Any tips to help getting started greatly appreciated. Cheers.

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• make sure i've configured dns correctly

  - by user22817

  Hi, On my server with Windows Server 2008, i've added a new zone with my new domain: biografica.ro. I've added a name server for it: ns.biografica.ro and the ip of the server. Also i added two A hosts for ns.biografica.ro and www.biografica.ro. I've also defined first that name server on the site where i bought the domain and pointed it to my ip. Now, i understood that i have to wait 24-48 hours for this new domain to be available online. Question: - is this a way to check on the server that i've succesfully configured it? For instance: nslookup biografica.ro or nslookup www.biografica.ro or ping www.biografica.ro do not work locally, on the server... Can you give me an advice? Thanks.

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• DNS settings for SaaS in the cloud?

  - by Jeremy

  I am building a SaaS product. When a user signs up for an account they must select an alias for their site --------.getlaunchpoint.com. Right now I have an A record *.getlaunchpoint.com that points to the ip address server. However, with Azure I am not given an IP address. The suggested implementation is to make use of a CNAME. I need to create a CNAME for *.getlaunchpoint.com - getlaunchpoint.cloudapp.net GoDaddy does not support CNAME wildcards. Searching on Google I'm getting conflicting information... is CNAME wildcard a bad practice? I run into the same problem with Amazon EC2 if I want to make use of load balancers because you cannot tie a public IP address to an Amazon Load Balancer. Amazon also suggests the use of a CNAME. Any help would be appreciated.

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• DNS is resolving fine but can't access the server (unless changing /etc/hosts)

  - by victor hugo

  Hi all, I have a VPS server with a public IP, I added some A entries in my name server like svn.example.com - 1.1.1.1 Also I added some entries in my workstation /etc/hosts file in order to work with the domains meanwhile the DNSs were refreshed. It's been around 3 days from this and I configures everything in my server (using the hosts file), the DNSs are ready and I removed the entries but for my surprise I can access the servers nor anything in my domain or sub-domains (even a ping doesn't work). I've triple checked and the DNSs are OK. I don't know too much about DNSs . Any help would be appreciated. The IP address of my VPS is 74.63.223.43 I have these domain names, all pointing to the same IP (using A entries) hartoingenio.com www.hartoingenio.com svn.hartoingenio.com

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