Kent W. England <kwe@6SigmaNets.com> wrote:

But I like PPP because cisco still doesn't document their HDLC line protocol. :-) (Go ahead, try to find it online or ask someone on one of the tech support lists to find it for you. :-)

Look in BSD/386 source code (/sys/net/if_c_hdlc*). I reverse-engineered their protocol quite a time ago, took a day of looking at bytes going back and forth :) --vadim