Man pages matching name pppoe-sniff in section 8:

pppoe-sniff.8.ja	debian 10 / manpages-ja
pppoe-sniff.8.en	debian 10 / pppoe
pppoe-sniff.8.ja	debian 11 / manpages-ja
pppoe-sniff.8.en	debian 11 / pppoe
pppoe-sniff.8.ja	debian 12 / manpages-ja
pppoe-sniff.8.en	debian 12 / pppoe