DNS not responding

From: Richard Bewley (rbewley_at_friend.ly.net)
Date: 11/28/03

  • Next message: Herculano de Lima Einloft Neto: "Re: Fedora - ports 32770-1 open" 
    To: <redhat-list@redhat.com>
Date: Thu, 27 Nov 2003 20:41:49 -0500

    Hello,

    This is more of a networking question, than a redhat specific question, or
    dns. Basically, on my setup, I have an ISDN line, which is connected to a
    Cisco router, 10.3.0.1. This is connected directly to eth1 of my linux box,
    which eth1 has the ip address 10.3.0.10. The other interface, eth0 has IP
    address 10.5.0.1, and handles all of my internal stuff, and acts as
    firewall/gateway. I plan to shortly get rid of the ISDN line and Cisco
    router, which is why I've moved to this setup.

    On the Cisco, I have the following lines:
    ip nat inside source static tcp 10.3.0.10 53 12.159.185.248 53 extendable
    ip nat inside source static udp 10.3.0.10 53 12.159.185.248 53 extendable

    This allows all tcp and udp requests on port 53 to be forwarded to my linux
    box. Now, when I do a dig @12.159.185.248 domain.com, it times out. When I
    check the named logs on my linux box, I can see the query, so I know the
    packet is coming in and being forwarded to the box correctly, however the
    problem seems to be that the packet is never able to go back out again.
    Just for troubleshooting, I added the following to iptables:

    -A INPUT -i eth1 -j ACCEPT
    -A INPUT -i eth0 -j ACCEPT
    -A INPUT -i lo -j ACCEPT

    But, it's still unable to send back a response to those queries, no matter
    where they come from. I can also do an nslookup on the linux box fine, so
    I'm unsure where the problem could be, any ideas?

    Thanks,
    Richard 

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