LINUX_MIB_TCPMTUPFAIL 283 net/ipv4/proc.c SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL), LINUX_MIB_TCPMTUPFAIL 2572 net/ipv4/tcp_input.c NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMTUPFAIL);