Tom Higgins wrote:

> Through many hours of debugging and banging my head against the wall, I have 
> finally discovered that the issue is with shorewall, as I have stopped 
> shorewall
> and the packets come through as per example 1, but as soon as you start it 
> again
> it breaks as per example 2.

How does it work after 'shorewall stop' if it depends on netmap to work
at all?

And do you really believe that all versions of Shorewall from 1.0 to
4.3.10 (including both -shell and -perl) work exactly the same? You must
since you didn't bother to give us *any* details about your Shorewall
configuration; even the version! (see
http://www.shorewall.net/support.htm#Guidelines).

So much for my ranting....

I'm guessing that Shorewall is loading an SNMP 'helper' module
('ip_nat_snmp_basic' or 'nf_nat_snmp_basic') and that's what is causing
the problem.

I suggest that you:

a) stop shorewall
b) Modify /etc/shorewall/shorewall.conf to specify DONT_LOAD=<whichever
module gets loaded in your case>
c) rmmod <whichever module gets loaded in your case>
d) start shorewall

Does it now work any better?

-Tom
--
Tom Eastep        \ When I die, I want to go like my Grandfather who
Shoreline,         \ died peacefully in his sleep. Not screaming like
Washington, USA     \ all of the passengers in his car
http://shorewall.net \________________________________________________

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