LINUX_MIB_TCPACKSKIPPEDCHALLENGE  280 net/ipv4/proc.c 	SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
LINUX_MIB_TCPACKSKIPPEDCHALLENGE 3465 net/ipv4/tcp_input.c 				   LINUX_MIB_TCPACKSKIPPEDCHALLENGE,