Re: [2.1.34] IP-masq still broken

David S. Miller (
Tue, 15 Apr 1997 04:04:13 -0400

Date: Tue, 15 Apr 1997 01:24:00 -0500 (EST)
From: Joshua Snyder <>

We had the same problem, but with a 2.0.x kernel. The fix was to make
sure that both ends of the ppp link had an mtu of 1500.

On Mon, 14 Apr 1997, B. James Phillippe wrote:

> I'm running 2.1.34 with IP masquerading. I've been running
> this setup (with previous revision kernels, of course) for a few months
> now and it's been working great. The latest problem, however, is that
> my masqueraded network cannot connect to (the search
> engine) or some of the TicketMaster CGI servers. The SYN is sent but
> the data never comes back. It just sits there stupidly, forever. Other
> web sites are fine. I can connect to excite without a problem, as can
> the masqueraded hosts when using squid on my box (a proxy cache server).

This smells very much of a MTU path discovery bugs. If someone could
send me complete verbose tcpdump's of when this bug is triggered I
would really appreciate it. Thanks.

Yow! 11.26 MB/s remote host TCP bandwidth & ////
199 usec remote TCP latency over 100Mb/s ////
ethernet. Beat that! ////
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David S. Miller, /_____________/ / // /_/ ><