test that large packets can be transmitted over weave

test/100_cross_hosts_test.sh

@@ -27,4 +27,10 @@ start_container $HOST2 net:$SUBNET_2 --name=c6
 C6=$(container_ip $HOST2 c6)
 assert_raises "exec_on $HOST1 c5 $PING $C6"
 
+# check large packets get through. The first attempt typically fails,
+# since the PMTU hasn't been discovered yet. The 2nd attempt should
+# succeed.
+exec_on $HOST1 c1 $PING -s 65000 $C2 2>&1 1>/dev/null || true
+assert_raises "exec_on $HOST1 c1 $PING -s 65000 $C2"
+
 end_suite