Index: uspace/lib/c/generic/inetcfg.c
===================================================================
--- uspace/lib/c/generic/inetcfg.c	(revision 92b42442e2fe12870594cc9064095c5f587a6fbd)
+++ uspace/lib/c/generic/inetcfg.c	(revision 06a1d07797fc4e18922cbd44b9d0ee795f27b1ad)
@@ -276,4 +276,5 @@
 
 	linfo->name = str_dup(name_buf);
+	linfo->def_mtu = IPC_GET_ARG1(answer);
 
 	return EOK;
Index: uspace/lib/c/include/inet/inetcfg.h
===================================================================
--- uspace/lib/c/include/inet/inetcfg.h	(revision 92b42442e2fe12870594cc9064095c5f587a6fbd)
+++ uspace/lib/c/include/inet/inetcfg.h	(revision 06a1d07797fc4e18922cbd44b9d0ee795f27b1ad)
@@ -61,4 +61,6 @@
 	/** Link service name */
 	char *name;
+	/** Default MTU */
+	size_t def_mtu;
 } inet_link_info_t;