Thanks for your answer.

My ISP is running FreeBSD, so I don't know if they have such a filter
on my address.  How would one check that?

I have a static address with a cable modem.  

Any more ideas would be appreciated.

Thanks again.
 -sen

WH Bouterse writes:
 > Ask your ISP if they have a 'netbios filter' on your IP address.
 > If so it needs to be removed.
 > This problem is cropping up more and more if that is the problem.
 > It has happened to me and others on this list and other Linux Lists.
 > 
 > For example on a dual-boot machine:
 > I was having to log out of Linux every 6 hours and boot M$
 > Then logout of M$ and reboot Linux which worked for another 6 hours.
 > Very maddening! Perhaps someday a workaround will be devised, It took
 > me two weeks and 4 different "Tech support" people before my problem
 > was tracked down by a tech who was running L-M 6.1 at home and 
 > checked my MAC address and found the dang filter.
 > This was a static IP Cable-Modem situation
 > 
 > This may not be your paticular problem but 
 > it certainly has been for myself and others!
 > 
 > BTW my ipmasq/ipchains are working great right now.
 > 
 > Good Luck
 > 
 > William Bouterse
 > Juneau Alaska
 > 
 > 
 > "S. Newhouse" wrote:
 > > 
 > > Hello,
 > >  I just started using ipchains and ip_masquerade.  Cool idea, but it
 > > has not been very stable on my linux boxes.
 > > 
 > > Setup:  host1 = PII-300 on internet with T1 connection  running
 > >                 ipchains and ip_masquerade, with 10 MB ethernet card
 > > 
 > >         host2 = PIII-600 on private net connected to host1 with 100 MB
 > >                 ethernet card
 > > 
 > >         host3 = Win-98 box on private net with 100 MB ethernet card
 > > 
 > > The linux boxes are running Mandrake 6.1, stock 2.2.13-7mdk kernel.
 > > 
 > > Things start fine, netscape, telnet, etc.
 > > 
 > >  Then host2 starts to randomly drop the connection to the
 > > outside. Works for several minutes, then stops.
 > > 
 > >  Strangely enough, host3 (running Win) works fine so far.
 > > 
 > > Any ideas?  Are there others using Mandrake with ipchains and ip_masq
 > > with no problems?
 > > 
 > > TIA,
 > >  -sen

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