I've finally managed to make a ppp connection over my isn (not isdn) line; the connection is made and i can ping other machines.
I've set asyncmap at both ends to 0xFFFFFFFF to block all control characters from being used. However, the hardware on the isn line uses ^S/^Q. However, it does this in hyardware for both the values themselves, and for the corresponding values with bit 8 high. So my connection doesn't stay up long enough to do anything useful-- even launching & xterm & telnet session is too much for it. So is there any way to add the "high" control characters to the asyncmap? Or do I have to switch over to a 6 bit slip instead of ppp? rick