$FreeBSD$AddloopbacksupportforFreeBSD.author:RadimKolar---mtu.h.origFriOct1020:56:392003+++mtu.hTueFeb1721:10:492004@@-58,6+58,7@@{4352,"FDDI"},{4500,"token ring (2)"},{9180,"FORE ATM"},+{16384,"loopback"},{16436,"sometimes loopback"},{18000,"token ring x4"},};