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Strange NAT problem [SOLVED]
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Teisiph
n00b
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Joined: 28 Jun 2006
Posts: 3

PostPosted: Mon Feb 19, 2007 4:08 pm    Post subject: Strange NAT problem [SOLVED] Reply with quote

Hello,

I've been trying to set up a simple NAT configuration on the local university network. After copying a simple script from one of my previous boxes, everything seemed to work ok, except for a few of my rss feeds..
I noticed that all non-working feeds have in common that they use feedburner.

1. I can access the feedburner site (http://www.feedburner.com/fb/a/home) from both the NAT'ed box and the router.
2. I can access the feedburner "feed subdomain" (feeds.feedburner.com), which redirects to the main site from both computers.
3. I can only access a feed from the router. The NAT'ed box just times out.
4. Some random other sites have the same problem (they time out only on the NAT'ed computer)

I tested by sending some headers (from the NAT'ed computer) and this is the result:
Code:
GET / HTTP/1.1
Host: feeds.feedburner.com

HTTP/1.1 302 Moved Temporarily


Code:
GET /BurnThisRSS2 HTTP/1.1
Host: feeds.feedburner.com

Timeout
The latter works fine from the router.

Iptables output (other chains are empty and have policy ACCEPT)
Code:

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
  121 61544 ACCEPT     all  --  ppp0   eth0    0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED
  142 15783 ACCEPT     all  --  eth0   ppp0    0.0.0.0/0            0.0.0.0/0

Chain POSTROUTING (policy ACCEPT 120K packets, 10M bytes)
 pkts bytes target     prot opt in     out     source               destination         
   12   720 SNAT       all  --  *      ppp0    172.20.33.4          0.0.0.0/0           to:145.94.36.232


Any idea what this is?

solution:

I have no idea what the problem was.. Even setting up full NAT didn't solve the problem. I've set up a VPN and routed all traffic trough it and now everything works fine (and secure).
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