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Re: IP masquerading and ADSL
- To: Eran Tromer <eran(at-nospam)tromer.org>
- Subject: Re: IP masquerading and ADSL
- From: Dani Arbel <darbel(at-nospam)techunix.technion.ac.il>
- Date: Sat, 3 Feb 2001 22:12:47 +0200 (IST)
- Cc: linux-il <linux-il(at-nospam)linux.org.il>
- Delivered-To: linux.org.il-linux-il@linux.org.il
- In-Reply-To: <3A7C4F33.B6EF33F5@tromer.org>
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
reduce the maxmtu of the win boxes to 1452 and they will work fine.
Dani
On Sat, 3 Feb 2001, Eran Tromer wrote:
> 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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