Is there any way to peg the PPP unit number to its underlying serial
device? Since the IPF/NAT rules are applied to an interface specified
by unit number, I want to make sure that the rules stay with the right
interface.

    eg
        ppp0 --> /dev/ttya
        ppp1 --> /dev/ttyb 

It seems that the unit number is allocated to pppd by an ioctl
(PPPIOCGUNIT), and with random disconnections and re-connections it
appears to be possible to end up with the unit numbers reversed.

  ... or am I missing something?

Rex
------------------------------------------------------------
Rex McMaster                            rmcm@compsoft.com.au 
                                   rex@mcmaster.wattle.id.au
     PGP Public key: http://www.compsoft.com.au/~rmcm/pgp-pk