eth0 -> ppp0 tcp starvation

From: Tony Borras (tonyb@sysdev.org)
Date: 01/01/03 

From: Tony Borras <tonyb@sysdev.org>
Date: Tue, 31 Dec 2002 15:44:24 -0800

> On Tue, 31 Dec 2002 15:37:46 -0500, Tony Borras wrote:
>
> > Slackware host on a network where comp1 is connected to comp2 via
eth0.
> > comp2 has the ppp0 connection to my dial-up.
> >
> > If say, I am sucking news articles (slrnpull or leafnode) at comp1
and
> > no other internet activity is happening on comp2 or comp1, my comp1
> > eth0->ppp0 starves. As soon as I do something else on comp2 or comp1

> > that causes ppp0 access, the starved thread resumes...
>
> Strange. What version of slackware and what kernel are you using?
What
> do you use to connect ppp0? I'm assuming you're using a firewall,
have
> you double-checked your rules?
>

Using a base Slak 8.0 which has been upgraded to current.
Currently on 2.4.20, but I think I have always seen this behavior
from eth0. I do not think pppd cares about who its client is (my
firewall does, however).

But then again, if my fetchnews was starved via eth0 and so was
netscape's
subscribe dialog, then if from that same ethernet host behind the
firewall
I ping google (20x), both connections resume???? That would indicate
to me that its not the firewall, but maybe my tcp_xxxx configuration in
/proc/sys/net/ipv4...

pppd startup:
# pppd is slow, so we fork its initialization.
/usr/sbin/pppd /dev/modem 115200 demand persist holdoff 5 idle 3600 \
connect '/usr/sbin/chat -v "" "AT&FE0L3Q0W2X4V1&B1&C1&D2S109=1" \
"OK" ATDT6300006 V42bis ""' defaultroute user xxxxxx

I think it could be the firewall, but more likely something I need to
set in some
echo "xx" > /proc/sys/net/ipv4/tcp_????

Happy new 2003
TonyB 

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