On Fri, Sep 07, 2001 at 02:12:59PM +0100, ptaylor wrote:
I am using an ISA 56K modem (not win as far as I know), and have managed to
get it working by various configurations including setserial. I am using
Uklinux and it connects at 115K but using kppp stats I see that it
consistently leaps and troughs quite badly and keeps stalling. The average
speed is about 600b/sec. Using a different modem on another machine I get a
good through rate with the same uklinux phone numbers so I assume it is some
setting in the modem itself or one on the linux box that is awry? It seems to
go quite quickly and gradually die and then continuously stall.
Any tips for configuration or trouble-shooting?
If you've got a noisy line then you could try fiddling around with the
MRU & MTU. Making these values smaller will mean shorter packets &
less chance of dropped packets. You should be able to make a
compromise somewhere where the overhead of smaller packets is balanced
by less packet loss hopefully resulting in the best throughput.
You can assess how you're doing by looking at the output of ifconfig
whilst your connection is up. The lines beginning RX & TX packets give
you the info you need.
I think the PPP-Howto explains all this.
You also might be able to complain to BT about a noisy line. If it
doesn't meet a minimum standard then I understand that they will fix
it without charge.
Tel: 01423 323019
PGP keyID: 0xC0B341A3