[PLUG] cisco 678 DSL latency issues

[Rogan Creswick]

I've recently subscribed to DSL (changing from comcast) and everything
works great, but only in Windows.

I'm running bridged with a cisco 678, 640/256, static ip.  If the
cisco is plugged into a windows box everything works great, ping times
are arround 90ms.  However, booting into Linux causes ping times to
jump to 2000ms, connectivity and bandwith are fine, but latency is
horrid (I can download a kernel at 40k/s or better, but it takes
2000ms for the xfer to start).

I've tried three computers and two phone jacks, two of the computers
dual boot (the third is my router, and runs only linux--everything is
Debian).  In all situations Windows works fine (90 ms ping) and Linux
does awefully (2000ms).  

Searching cisco's site mentioned that Linux boxen may have difficulty
connecting to cisco hardware without term/termcap, however installing
termcap-compat on my laptop (one of the dual-boot boxes) has had no
effect (possibly a _small_ change, 1800ms is probably the average).

Can anyone reccomend a way to better troubleshoot this? Qwest and my
isp (Unicom, wich I've been very happy with barring this issue) are
completely lost and I'm not sure what to look for. 

All the Linux boxes have been running 2.4.18 or 2.4.20 custom kernels,
and they work fine with my comcast (cable) connection (well, as fine
as anything works with comcast).

Thanks,
Rogan Creswick