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[ILUG] Strange FTP problem

[ILUG] Strange FTP problem

Justin Mason jm at jmason.org
Sat Oct 27 07:12:51 IST 2001


Niall O Broin said:

> A colleague of mine recently upgraded his internet access from ISDN to ADSL
> and has encountered a strange FTP problem. It seems most likely that the
> problem is related to the 3Com ADSL router which also does NAT for his
> network but as the problem is only on one server (so far) I'm hoping I can
> resolve it on the server side. 
> 
> The problem is that when he connects to the server and gets data (e.g. does
> an ls) the client hangs. We've been in touch with the author of wu-ftpd and
> he suggested that recompiling wu-ftpd and giving the --enable_bad_clients to
> configure might work because some clients incorrectly don't wait for a close
> from the remote end. Tried that, didn't work :-(

MTU related, I'd bet.  I'd suggest bringing the MTU on all boxes in the
internal network down to, em, 1412 I think? can't remember for sure.

Do a web search for "clampmss" and you'll see what's up.  Summary: crappy
PPPoE is a broken protocol.

--j.




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