From: Ivan Kelly (ivan at domain ivankelly.net)
Date: Sat 27 Oct 2001 - 11:29:13 IST
AFAIR the ftp protocol has problems with NAT. i had a similar problem
with a LAN i administered. the routing machine itself could access ftp
clients but any of the internal machines couldn't. i recompied my kernel
with Networking Options->Netfilter Configuration->Ftp Protocol Support
and everything worked fine then. I've also heard that passive ftp can
get around this but i havent tested it.
On Fri, Oct 26, 2001 at 07:10:23PM +0100, Niall O Broin wrote:
> 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 :-(
> The curious thing is that it's only on this one server which is running
> RH6.2. If I take a copy of the ftpd binary (a slightly earlier version of
> wu-ftpd) which is running on another server (RH5.3) the problem still exists.
> As I write this it occurs to me that this might be kernel related, the two
> mentioned boxes having different kernel versions, (the working one has 2.2.6
> and the non working 2.2.14), but as these boxes are colo'ed in the US kernel
> upgrades are a tad tricky. Two kernel monte would help, but I'd have to
> compile a kernel with TKM support - anyone see the problem here :-) ?
> Suggestions welcome - very welcome, even.
> P.S. One good suggestion is obviously to use scp which I am trying to
> persuade him to do. Mind you, he's a Mac user and I'm sure he'll miss his
> cute Macintosh GUI FTP client.
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