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Old 10-27-2004, 11:27 AM   #1
Doug Melvin
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Registered: Oct 2004
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Bizarre routing problem

I have a problem where there's no route found to a select set of seemingly random IP's on the internet.

Specifically, I have a router running linux 2.4.22, djbdns (for dns caching) and an iptables firewall. On the private side of the router sit 15 computers, and on the public side sits a cable modem. IP masquerading and packet filtering appear to work just fine-- you can connect to almost everything on the internet from the 15 computers on the private side of the router. This includes any number of websites, IRC, AIM, etc. to all kinds of places- servers in the US and abroad. However, there are a number of hostnames where either:

1. The hostname is not resolved because the dns cache cannot find a route to the computer hosting the appropriate dns record. However, a route does exist to the IP address of the host--- I just can't resolve it because no route exists to the dns server.

2. I can resolve the hostname to an IP address because a route exists to the computer hosting the dns records, but not route exists to the IP address of the host I'm looking for.

3. Both 1 & 2

In the case where no route exists to the IP address in question, traceroute reveals that packets don't make it past the gateway.

Any help would be greatly appreciated.

Last edited by Doug Melvin; 10-27-2004 at 01:13 PM.
Old 10-28-2004, 01:04 PM   #2
Doug Melvin
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Registered: Oct 2004
Posts: 2

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literally any idea-- even other places to go for help-- would be appreciated


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