RTF_MTU 58 include/linux/route.h #define RTF_MSS RTF_MTU /* Compatibility :-( */ RTF_MTU 426 net/ipv4/fib_frontend.c if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { RTF_MTU 434 net/ipv4/fib_frontend.c if (rt->rt_flags & RTF_MTU)