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Old 02-19-2010, 01:16 PM   #1
rock_ya_baby
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Redirect local DNS query to remote DNS server on non standard port?


The issue is that my CentOS workstation is in a vlan from where the Intranet's DNS servers are unreachable.

For browsing the web there is an ISA proxy server, which I presume resolves DNS for my firefox. However, wget, host, ping and aria2c fail to get any sort of DNS resolution since they're being run from command line.

I have exported HTTP_PROXY value, which provides me internet access on console, but,only when I connect using IP address. It fails on name resolution.


--

My question is:

May I redirect the DNS queries to my home PC which would be running a DNS server on a non standard port?


I was thinking of putting

nameserver 127.0.0.1 in /etc/resolv.conf

and then put iptables rule to redirect 127.0.0.1:53 UDP to a.public.ip.address:3535 UDP

I don't know if I am shooting blanks or what, I am not very much aware of this kind of setup.

--

My main need is to provide DNS resolution to console apps.

I want to utilize my company's idle bandwidth for bulk downloads, so, using proxy, SSH tunneling through my Home PC is out of question.

Any ideas that I can read upon?

Last edited by rock_ya_baby; 02-19-2010 at 01:21 PM.
 
Old 02-19-2010, 01:58 PM   #2
MensaWater
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It sounds as if you have an http proxy working and what you need is a command line proxy.

You might want to have a look at this article to see if it helps you do that (I haven't done this myself but it looks like it may be what you need):

http://www.aboutdebian.com/proxy.htm

P.S. But iptables exists on other distros so it can probably be adapted fairly easily.
 
Old 02-20-2010, 11:52 AM   #3
rock_ya_baby
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^ I thought I made my query simple

Well, I don't require help in setting up HTTP proxy for command line, that I already have. Please read the post once again.
 
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Old 02-20-2010, 12:00 PM   #4
Web31337
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why hack iptables rules? why use unstandard port for DNS? It is not meant to be installed on other port than 53, like some other standard internet services. i think a better solution will be configure iptables on your home pc allowing only your company external IP/subnet to interact with your port 53. isn't that a good idea?
 
Old 02-20-2010, 11:22 PM   #5
rock_ya_baby
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The reason behind running it on different port on my home PC is because outgoing 53 is blocked at my work place.

My requirement is only to resolve DNS using a server which is outside my office network and hopefully running DNS on some other port than 53.
 
Old 02-21-2010, 06:25 AM   #6
Web31337
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Oh... then the only idea I have here is to use a tool like openvpn or something.
Out of other ideas.
Interesting question.
It better fits in "Networking" forum.

Last edited by Web31337; 02-21-2010 at 06:27 AM.
 
Old 02-22-2010, 08:31 AM   #7
MensaWater
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Quote:
Originally Posted by rock_ya_baby View Post
^ I thought I made my query simple

Well, I don't require help in setting up HTTP proxy for command line, that I already have. Please read the post once again.
I didn't suggest an "http" proxy. Maybe YOU should read once again.

Better yet just blow it out your wazoo.

Last edited by MensaWater; 02-22-2010 at 08:49 AM.
 
Old 04-13-2010, 04:06 AM   #8
sowmika
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Spam removal.

Last edited by GrapefruiTgirl; 05-07-2010 at 07:37 AM. Reason: Spam removal.
 
Old 04-13-2010, 04:31 AM   #9
bathory
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@OP
Quote:
The reason behind running it on different port on my home PC is because outgoing 53 is blocked at my work place.

My requirement is only to resolve DNS using a server which is outside my office network and hopefully running DNS on some other port than 53.
You can use forwarders:
Code:
forward only;
forwarders {x.x.x.x port yy;};
 
  


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