./"unit"8t"mtu"8t"net"8t"host"8t8t"addr"n4+ddd2+X4+Xn"head"16t"tail"16tnXX12+n"ipack"16t"ierr"nDDn"opack"16t"oerr"16t"coll"nDDDn"next"nXn
