[3799] in RedHat Linux List
Re: changing MRU/MTU in ppp connection..
daemon@ATHENA.MIT.EDU (Daniel Senie)
Sun Nov 10 23:10:56 1996
Date: Sun, 10 Nov 1996 23:07:43 -0500 (EST)
From: Daniel Senie <dts@senie.com>
To: Robert Hart <iweft@ipax.com.au>
cc: redhat-list@redhat.com
In-Reply-To: <Pine.LNX.3.95.961111091235.16640E-100000@archenland.interweft.com.au>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
On Mon, 11 Nov 1996, Robert Hart wrote:
> On Sun, 10 Nov 1996, Rick Prince wrote:
>
> > At 03:16 AM 11/10/96 -0700, you wrote:
> > >i managed to connect using ppp on RH4.0, but i cannot change the
> > >MTU..although i expressed exclusively in my connection script.
> > >here's the script and result from netstat -i
> > >
> > >exec /usr/sbin/pppd debug modem crtscts /dev/modem 115200\
> > > asyncmap 200A0000 escape FF kdebug 0 $LOCAL_IP:$REMOTE_IP \
> > > vj-max-slots 8 mru 1500 mtu 1500 -chap -pap \
> > > noipdefault netmask $NETMASK defaultroute connect $DIALER_SCRIPT
>
>
> > The only way I know of setting MTU is through 'ifconfig'. Once your
> > connected through your modem/ppp, you can manually do this or stick it in
> > your modem script enter:
> >
> > ifconfig ppp0 mtu 1500
>
> With PPP, options such as MTU are negotiated with the peer - and if there
> is not agreement between requests I *suspect* that the lowest requested
> value between the two ends is used.
>
> Anyone know for sure?
>
The RFCs stipulate a value of 1500 if no negotiation takes place. If PPP
does negotiate values, the negotiation will either settle on an agreeable
value, or the link will fail to start. The negotiated value is normally
greater than or equal to 576.
Dan
---------------------------------------------------------------
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Daniel Senie Consulting n1jeb@senie.com
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