diff --git a/proto/ospf/dbdes.c b/proto/ospf/dbdes.c
index 8cd7c8b..687eaa9 100644
--- a/proto/ospf/dbdes.c
+++ b/proto/ospf/dbdes.c
@@ -286,6 +286,10 @@ ospf_dbdes_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
       n->options = ps_options;
       n->myimms.bit.ms = 0;
       n->imms.byte = ps->imms.byte;
+      if ((ps->iface_mtu != ifa->iface->mtu) && ((ifa->type != OSPF_IT_VLINK) ||
+		((ps->iface_mtu != 0) && (ifa->iface->mtu != 0))))
+	log(L_WARN "MTU mismatch with neighbour %I on interface %s (remote %d, our %d)",
+		n->ip, ifa->iface->name, ps->iface_mtu, ifa->iface->mtu);
       OSPF_TRACE(D_PACKETS, "I'm slave to %I.", n->ip);
       ospf_neigh_sm(n, INM_NEGDONE);
       ospf_dbdes_send(n, 1);
@@ -299,6 +303,10 @@ ospf_dbdes_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
       n->options = ps_options;
       n->ddr = ps_ddseq - 1;	/* It will be set corectly a few lines down */
       n->imms.byte = ps->imms.byte;
+      if ((ps->iface_mtu != ifa->iface->mtu) && ((ifa->type != OSPF_IT_VLINK) ||
+		((ps->iface_mtu != 0) && (ifa->iface->mtu != 0))))
+	log(L_WARN "MTU mismatch with neighbour %I on interface %s (remote %d, our %d)",
+		n->ip, ifa->iface->name, ps->iface_mtu, ifa->iface->mtu);
       OSPF_TRACE(D_PACKETS, "I'm master to %I.", n->ip);
       ospf_neigh_sm(n, INM_NEGDONE);
     }
diff --git a/proto/ospf/iface.c b/proto/ospf/iface.c
index cced710..0a6a782 100644
--- a/proto/ospf/iface.c
+++ b/proto/ospf/iface.c
@@ -86,6 +86,7 @@ ospf_sk_open(struct ospf_iface *ifa)
   sk->tbsize = rxbufsize(ifa);
   sk->data = (void *) ifa;
   sk->flags = SKF_LADDR_RX;
+  sk->ttl = 1;
 
   if (sk_open(sk) != 0)
     goto err;