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Old 01-31-2005, 07:56 AM   #1
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Question Browsing is stopping with iptables


I have configured a Linux (fedora 11) server with Squid proxy and iptables based firewall.(it is normal proxy not a transperant one)
I have also enabled caching in the server.natting is enabled with
iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source
ip_forwarding is also enabled.
the internal IP is given full access to the pool of

I am facing a peculiar problem in the sense that browsing is working after 15 mins or so the browsing is stopping. After that if I am restarting the network services the browsing is again getting enabled.

The cache log is showing as the interface eth0 is destination unreachable.

Please urgently help me.

Old 01-31-2005, 06:21 PM   #2
Registered: Mar 2004
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Distribution: Debian
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Check the mtu value on the cards and lower them to 1452 or try out several values in steps of 8. Default is usually 1492.

Add "mtu xxxx" to the configuration file of your network devices.
Old 02-01-2005, 02:37 PM   #3
Registered: Feb 2002
Location: Grenoble
Distribution: Debian
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Is there anything in /var/log/messages ?
Old 02-05-2005, 12:41 PM   #4
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How to change MTU XXX


I am not being able to find this option can u please tell me where & how to cjange this MTU option.



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