Subject: Re: ADSL upstream problems on Sparc NetBSD 1.5
To: Sebastian Wain <email@example.com>
From: Manuel Bouyer <firstname.lastname@example.org>
Date: 09/08/2001 18:21:31
On Fri, Sep 07, 2001 at 07:40:54PM -0400, Sebastian Wain wrote:
> On Fri, 7 Sep 2001 18:43:01 +0200
> Manuel Bouyer <email@example.com> wrote:
> > On Thu, Sep 06, 2001 at 09:46:28PM -0400, Sebastian Wain wrote:
> > > Hello,
> > >
> > > I have an ADSL connection (using the ethernet Alcatel Speed Touch Home
> > > modem) and in any operating system that I used this connection via PPTP
> > > (Linux, OpenBSD, NetBSD, excepted windows) there is a problem "uploading"
> > > information to Internet, that is sending a bulk of data from my machine to
> > > other on Internet (for example sending an attachment in my mail, doing a
> > > scp to a remote machine and so on).
> > >
> > > Currently the NetBSD is my firewall and it's the machine connected
> > > to the modem doing nat.
> > >
> > > I read some info about this problem on Internet, it's related to a MTU
> > > problem, but playing with differents hints I have not solved it.
> > > There is some tcpmssfix in the ppp program, but since the pptp is using the
> > > pppd I didn't see any patch to this (or I didn't recognize it).
> > Did you try turning on or off some IP options ?
> > Especially turning off PMTU discovery on the clients machine.
> I played with net.ipv4.ip_no_pmtu_disc, net.inet.ip.mtudisc,
> net.inet.tcp_mss_ifmtu on the machine connected to the adsl modem.
> I didn't especify the problem in my previous mail:
> - Sometimes I loose the connection.
> - When I didn't loose the connection, while the machine is
> uploading info, the PING to a site with average 85 ms of delay goes to
> 1000 ms of delay.
Ha, this may be a queuing problem at the remote end then ...
Manuel Bouyer <firstname.lastname@example.org>