Re: TCP outgoing problems in 2.0.X?

Meelis Roos (
Fri, 24 Jul 1998 17:38:19 +0300

AH> I've got a 16MB 5x86WB-133 box running linux as a ip_masq for a lan, and it
AH> works great, except for one problem; after anywhere from a few minutes to a
AH> few hours of uptime, the box suddenly refuses to make any outgoing TCP
AH> connections. One moment, I'll be able to telnet/ftp/browse out from the
AH> box, and the next, nothing happens. When this problem occurs, it does not

You are probably using ipautofw to redurect a range of tcp ports. This doesn't
actually work since the kernel allocates its localt ports for outgoing
connections from the same range.

Possible solutions: redirect only a small range of ports so the problems
will go away very soon. Or don't use ipautofw to redirect ranges of ports.
Or use (or write) a masq module for the protocol if possible.

You can make sure that this is the problem if you are using ipautofw and when
you flush ipautofw rules it starts working.

Meelis Roos (

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