diff -urb olsrd-0.5.6.orig/lib/dyn_gw/src/olsrd_dyn_gw.c olsrd-0.5.6/lib/dyn_gw/src/olsrd_dyn_gw.c
--- olsrd-0.5.6.orig/lib/dyn_gw/src/olsrd_dyn_gw.c	2008-09-16 01:14:44.000000000 +0200
+++ olsrd-0.5.6/lib/dyn_gw/src/olsrd_dyn_gw.c	2008-09-16 01:26:55.000000000 +0200
@@ -191,8 +191,8 @@
     }
 
     //printf("GOT: %s(%08x)",inet_ntoa(foo_addr),foo_addr.s_addr);
-    if (inet_pton(olsr_cnf->ip_version, s_netaddr, &temp_netmask) <= 0) {
-        OLSR_PRINTF(0, "Illegal netmask \"%s\"", s_netaddr);
+    if (inet_pton(olsr_cnf->ip_version, s_mask, &temp_netmask) <= 0) {
+        OLSR_PRINTF(0, "Illegal netmask \"%s\"", s_mask);
         return 1;
     }