Howdy list,
Thanks to mulix, my Linux ADSL connection is up and running. Next, I set
up IP masquerading, and encountered the following odd problem.
When conneting from some host on the LAN, every time the remote host
tries to send "a lot of data at once" (a large TCP packet, perhaps?),
the masqueraded TCP connection is lost. So, for instance, when
telnetting to a POP server I can download short e-mails -- any number of
them, in fact -- but if I try to RETR a long e-mail the connection is
immediately broken (I don't even get the header). The same happens on
other ports (e.g, HTTP only retrieves short pages, telnet breaks on long
'ls' outputs).
>From the masquerading box (the one talking to the ADSL modem), all works
fine.
Notably, the same happens with Windows2000 masquerading using ADSL,
while ISDN masquerading worked fine on the same Windows2000 box. I would
have suspected a fault in the modem (Orckit ATUR3) or ISP (Internet
Gold), but they're not supposed to be able to distinguish masqueraded
sessions, at least not nonmaliciously.
On the Linux box which runs kernel 2.4.1, I set up masquerading using
# insmod ipchains
# ipfwadm-wrapper -F -a m -S 192.168.0.0/16 -D 0.0.0.0/0
(yes, compatibility layer upon compatibility layer, but may Murphy curse
me if I relearn those arcane command line options yet again!)
I would have tried a 2.2 kernel, but since the same problem occurs with
Windows2000 this probably won't change anything.
Any ideas? Did anyone else encounter this?
Regards,
Eran Tromer
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