[lug] Iptables

John Hernandez John.Hernandez at noaa.gov
Thu Aug 3 16:53:01 MDT 2006

Also, you might want to double check that IP forwarding is enabled in
the kernel.

echo "1" > /proc/sys/net/ipv4/ip_forward

Zan Lynx wrote:
> You probably have a DROP rule somewhere, or as a chain default.  I
> always put a LOG target just ahead of any DROP (at least at first until
> I get tired of the spam) so that I can see what is happening.
> You can see if DROPs are getting hit just by redirecting the iptables
> output to a temporary file, then do some network traffic, then dump to
> another temporary file, then diff the two files.
> On Thu, 2006-08-03 at 15:20 -0600, Dan Ferris wrote:
>> Hello list,
>> I have the following in an iptables setup:
> [snip]
>> Of course, the issue is that NOTHING will NAT properly.  In fact, those 
>> rules are NEVER hit at all.  I watch with a sniffer and I can see the 
>> traffic come into the proper interfaces, but nothing ever happens.  This 
>> problem is getting very confusing and frustrating, so any suggestions 
>> would be appreciated.
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