Messages in this thread | | | Date | Sun, 28 Feb 1999 10:30:38 -0800 (PST) | From | "B. James Phillippe" <> | Subject | Re: ppp mru/mtu and ip masquerading |
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On Sun, 28 Feb 1999, Alan Cox wrote:
> > David Miller asked me for some tcpdumps when I first reported it on > > linux-kernel over a year ago, which I sent, but he was unable to find the > > source of the problem. Toggling ip_no_pmtu_disc has no effect. Sort of > > embarrassing that Linux networking has held this bug for so long. > > The Linux networking traces I've seen with MTU discovery all show it working > correctly and faults at remote sites. I have yet to see a single case where > the problem is the Linux end with 2.0.x
The reason I was so suspicious of the problem being at our (Linux) end, is because you can reach the site no problem from the masq/firewall box; just not from the clients. I was also suspicious because such a large number of sites have this problem (though I've since learned not to underestimate the potential for mass ignorance. ;) The masq box and the clients are both reaching the outside through the same interface and MTU (obviously). The problem only occurs with the client. I could be mistaken, but IIRC the dumps showed the masq'd client's SYN go out and hit the target, and the target response come back and hit the firewall. I don't know enough about tcpdump output to see why the response wasn't demasq'd and returned to the client. I'm no longer using a modem for Internet access, so I can't test it anymore.
-bp -- B. James Phillippe . bryan@terran.org Software Engineer, WGT Inc. . http://www.terran.org/~bryan
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