Messages in this thread | | | From | Rob van Nieuwkerk <> | Subject | Re: Linux 2.2.7-ac1 Path MTU bug | Date | Wed, 5 May 1999 17:57:35 +0200 (CEST) |
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Andi Kleen wrote: > > In muc.lists.linux-kernel, you wrote: > > > >Hi, > > > >I think I have found a Path MTU Discovery bug in Linux-2.2.7-ac1. > > > >1. Linux sends a packet > PMTU > >2. "ICMP Host Unreachable - need to frag" received > >3. PMTU-sized packet is sent > >4. data which comes after the packet from 1. is sent in PMTU-sized > > packets. > > > >The problem is that the data remaining in the packet 1. which comes after > >the PMTU length is never resent. So the TCP connection stalls at this point. > >See the tcpdump example below (bytes 1510-1582 are not sent). > > > >Sometimes the PMTU mechanism does work OK. The bug is easily reproducable. > >The problem is not Ultrix related: it happens with HP-UX & Linux too. > >I did not try a normal (non -ac) 2.2.7 kernel. > > I cannot reproduce it here. What compiler do you use?
Hi Andy,
I wanted to reply "the standard gcc that comes with Red Hat 5.2". I just checked. Shit !!!. Some weeks ago the system was upgraded (not by me) from RH 4.2 -> 5.2. And in that process the normal gcc was apparently nuked. So the kernel was compiled with egcs-1.0.3a.
I know what that means ... I'll reinstall gcc and recompile the kernel. For this moment please ignore my bug report.
Sorry for the confusion.
Greetings, Rob van Nieuwkerk
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