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PPP Script & Options processing order
Regardless of which direction ppp connects (eg dial out, or answering call), a sequence of script and option files are accessed to handle that event.
The useage of some of the files make sense only in the context of the direction. Regardless, *all* files are looked for, in strict order.
It is not an error for any / all of these files to be missing.
Rule 1) The command line is an override.
Any syntax expressed on the command line, eg options, override any subsequent, conflicting options.
Rule 2) Conflicting options are legal in the chain of option files processed. The last option encountered overrides all others (except the command line)
Rule 3) ALL files are processed if found.
| OPTION FILE ORDER | General use |
| /etc/ppp/options | Both |
| $HOME/(dot)pprc | Outgoing per user |
| /etc/ppp/options(dot)pppn | Incoming per 'line' |
n = the ppp line established
for incoming call(s), starting at ppp0
| SCRIPT FILE ORDER | |
| /etc/ppp/auth_up | called ONLY if the peer authenticates |
| /etc/ppp/ip_up | called once the ICMP protocol has been established |
| /etc/ppp/ipx-up | called ONLY if ipx superimposed. |
Of these, only ip_up is garanteed to fire.