At least on my Windows 2000 MTU of 1536 was used after connection was
opened using the Bezeq dialer... Did you compute the MTU yourself or
used some reference? If I understand well, you need to substract from
1500 the size of all headers added by PPTP, corect?
Thanks,
Haim.
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Dani Arbel
> Sent: Sunday, February 04, 2001 10:13 AM
> To: Eran Tromer
> Cc: linux-il
> Subject: Re: IP masquerading and ADSL
>
>
> 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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