On 5/11/22 04:23, Arnd Bergmann wrote: > indication of appletalk ever being supported there, this all looks > IPv4/IPv6 specific. There was support for PPP_IPX until it was > dropped this year (the kernel side got removed in 2018), but never > for PPP_AT. > Adding Paul Mackerras to Cc, he might know more about it. I waited a bit before chipping in, as I think Paul would know more. The ATCP stuff was in at least a few vendor branches, but I don't think it ever made it into the main distribution. These commits seem to be where the (disabled by default) references to it first appeared: commit 50c9469f0f683c7bf8ebad9b7f97bfc03c6a4122 Author: Paul Mackerras <paulus@xxxxxxxxx> Date: Tue Mar 4 03:32:37 1997 +0000 add defs for appletalk commit 01548ef15e0f41f9f6af33860fb459a7f578f004 Author: Paul Mackerras <paulus@xxxxxxxxx> Date: Tue Mar 4 03:41:17 1997 +0000 connect time stuff gone to auth.c, don't die on EINTR from opening tty, ignore NCP packets during authentication, fix recursive signal problem in kill_my_pg The disabled-by-default parts were likely support contributions for those other distributions. (Very likely in BSD.) I would've thought AppleTalk was completely gone by now, and I certainly would not be sad to see the dregs removed from pppd, but there was a patch release on the netatalk package just last month, so what do I know? (The only possible reason I can see to keep any ATCP bits around at all is to make sure we can write nice-looking log messages -- to say we're rejecting "AppleTalk Control Protocol" rather than "unknown 8029." But that'd be a very minor feature.) -- James Carlson 42.703N 71.076W FN42lq08 <carlsonj@xxxxxxxxxxxxxxx>