On 10/03/16 12:39, Manish Kambdur wrote: > I wasn't sure my diagnosis was right till you confirmed it was, thanks a lot. > > I was able to get the setup working! Good to hear! >> Assuming you can't find those options present in /etc/ppp/options > > I had misunderstood how the command line option "file" works as I was > thinking that it override all other options. > > I was starting pppd as `pppd call gprs` (with gprs in /etc/ppp/peers/) > and didn't think that pppd reads both the /etc/ppp/options and gprs > file. Yes, it does. /etc/ppp/options sets the system-wide options required for all links. The privileged "call" and unprivileged "file" options are there (along with the command line) to add options that are specific to an individual link. >> For what it's worth, I think the peer you're talking to is garbage. At >> a minimum, any reasonable implementation of PPP should accept the >> defaults, which means that dropping the link just because your end >> doesn't want to do ACFC and PFC is pure nonsense. How could any >> competent implementation fail to operate without header compression? >> How much do you trust that peer if they can't get the basics of PPP right? > > The "peer" here refers to the serial modem or the remote server? > pppd succeeds when I use a modem from a different brand, with the same > SIM and with 'noaccomp' and 'nopcomp' > I'm guessing this is GPRS/3GPP, and not a real modem. That information would have helped. GPRS has a number of built-in design flaws. One of them is that the LCP negotiation is done locally (not end-to-end) along with a completely faked-out authentication layer. The "real" negotiation with the remote endpoint doesn't occur until the Network phase -- that is, during IPCP. So, yes, I'm referring to the device doing LCP negotiation. It's not doing it right. -- James Carlson 42.703N 71.076W <carlsonj@xxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-ppp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
