Re: ppp mru/mtu and ip masquerading
Richard Waid (rwaid@es.co.nz)
Mon, 01 Mar 1999 08:34:59 +1300 (NZDT)
On 28-Feb-99 B. James Phillippe wrote:
> On Sun, 28 Feb 1999, Alan Cox wrote:
>> 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
One of my business partners had this problem a couple of weeks ago, fixed by
changing the MTU on the gateway/masq box to 1500. What was strange though,
and _really_ masked the problem was that it was only with certain web sites
(specifically, the web sites would return in response to a HEAD but not a GET,
I guessed that this was something to do with the difference in packet size), and
only the Linux and WinNT boxes inside the network had this problem - the OS/2
box worked fine. I'll ask him for TCPdumps of his version of the problem, if
that would help.
---
Richard Waid.
Network Engineer - richard@iopen.co.nz - 021 636 661
iOpen Technologies Ltd. - www.iopen.co.nz
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