I was having some problems with my PPPoE DSL connection being dropped 
(using m0n0wall's PPPoE client). After several weeks and much research 
and frustration, I believe I have found it is due to m0n0wall sending 
out LCP packets and not receiving any LCP echos from my provider 
(Bellsouth).

Soo.... I found a way to disable LCP by editing /var/etc/mpd.conf and 
setting the "link keep-alive" option to 0 seconds.

What are the implications of disabling LCP? If my modem drops connection 
for some reason, will m0n0wall just sit there and not ever try to 
re-establish a connection? What if a PC requests something on the 
Internet, will it then try to reconnect?