Eran,
use mru 1542 and mtu 1542 in your pptp command to reduce the packet size
received from the peer.
This is updated in the new HOWTO
Dani
On Sun, 4 Feb 2001, Eran Tromer wrote:
> Hello,
>
> I tried reducing the MTU on the client box, and it doesn't help. I can't
> see why it should -- the problem occurs when the *remote* host is
> sending a large packet *into* the LAN.
>
> Looking at captured network traffic both between the masquerading box
> and the ADL modem and between the masquerading box and the client box, I
> see no packet larger than 500 bytes. This means that the large packets
> are eaten by the ADSL modem, or earlier somewhere out there.
>
> Eran
>
>
> Dani Arbel wrote:
> >
> > 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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