Man pages matching name ipfilter.conf in section 5:

ipfilter.conf.5.en	debian 10 / netscript-2.4
ipfilter.conf.5.en	debian 10 / netscript-ipfilter
ipfilter.conf.5.en	debian 11 / netscript-2.4
ipfilter.conf.5.en	debian 11 / netscript-ipfilter
ipfilter.conf.5.en	debian 12 / netscript-2.4
ipfilter.conf.5.en	debian 12 / netscript-ipfilter