Some days ago I reported a PMTU bug I observed:
+------------------------------------------------
| 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.
+------------------------------------------------
I just re-tested with Linux-2.2.7-ac2: the same thing happens.
The problem is easily reproducable.
SysInfo:
--------
dual CPU AlphaServer 2000 4/200, Linux-2.2.7-ac2 SMP,
well maintained Red Hat 5.2 / Alpha
egcs-1.0.3a compiler
(the one that comes with RH 5.2: there is no gcc in RH 5.2 / Alpha)
Greetings,
Rob van Nieuwkerk
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