what is this stuff from lsof?

I ran lsof and was just paging through the loooooong printout and ran across this ominous sounding messages: pppd 12125 root 4u sock 0,0 32167 can't identify protocol pppd 12125 root 5u sock 0,0 32276 can't identify protocol pppd 12125 root 6u sock 0,0 32261 can't identify protocol I am running pppoed. Is it part of that, or an intrusion? Thanks, kevin.