sysctl -a sysctl -A sysctl mib sysctl net.ipv4.conf.all.rp_filter
result:
abi.vsyscall32 = 1 debug.exception-trace = 1 debug.kprobes-optimization = 1 dev.cdrom.autoclose = 1 dev.cdrom.autoeject = 0 dev.cdrom.check_media = 0 dev.cdrom.debug = 0 dev.cdrom.info = CD-ROM information, Id: cdrom.c 3.20 2003/12/17 dev.cdrom.info = dev.cdrom.info = drive name: sr0 dev.cdrom.info = drive speed: 48 dev.cdrom.info = drive # of slots: 1