[pptp-server] ISDN and pptp

[Larry Rivera]

Hello all:
I just finished upgrading from an analog 56Kflex dedicated connection
for my pptp server to ISDN 64K. For those interested this is my setup:
For USA ISDN Use
1. Kernel 2.2.13
2. Using NETSpider ISDN passive modem which uses the hisax drivers that
you can compile into the kernel . (http://www.ttcomms.com)
3. Using latest pptpd with patch to avoid dreaded CTRL: couldn't read
packet header (exit)
[1420]: CTRL: CTRL read failed, error messages that blitz log files
until disk fills up.
4. Using latest isdn4linux utilities.
5. Make sure you know your SPID which goes with your ISDN line.

Result: Full 35-40% increase in speed of packets passing through my pptp
tunnels (two at the same time) and dramatic decrease in screen
"freeze-ups"

So far I have not had the need to use the second channel to shoot to
128K (this requires upgrade in ISP service so that second connection can
be added to bundle with MPPP)

LR