Installing and Administering PPP

142 Chapter 6
Troubleshooting pppd
Run a local name server that is either Start of Authority (SOA) or an
authoritative secondary Name Server (NS) for your name space (forward
mapping) and your address space (reverse mapping). An authoritative
secondary NS is one that is listed in the SOA’s Resource Record (RR) for
that domain.
Scenario: Using PPP on a system or network where Frame (a WYSIWYG
document production system) is installed, pppd dials the modem hourly
even though no users are actively using it. The pppd.log file shows a line
like:
9/23-18:48:34-83 udp 192.0.2.1/3680 ->
192.0.2.2/sunrpc 45 bringup
Solution: This is Frame’s copy license manager probing for other license managers
on the network. To avoid bringing up the link for this sort of packet,
append ‘!sunrpc’ to the ‘bringup’ filter in the Filter file.
Scenario When PPP is used in SLIP mode, the peer receives only alternating
frames. Every other frame is discarded.
Solution The peer’s SLIP implements only the optional framing style suggested in
the PROTOCOL section of RFC 1055, and cannot receive adjacent
frames separated by only one END character (0xC0). Add extra-slip-end
to the pppd command line.