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-rw-r--r--test/test_ip4.py26
1 files changed, 26 insertions, 0 deletions
diff --git a/test/test_ip4.py b/test/test_ip4.py
index 79d4a36285c..1a611251eb5 100644
--- a/test/test_ip4.py
+++ b/test/test_ip4.py
@@ -1287,6 +1287,32 @@ class TestIPInput(VppTestCase):
self.assertEqual(icmp.src, self.pg0.remote_ip4)
self.assertEqual(icmp.dst, self.pg1.remote_ip4)
+ #
+ # MTU exceeded
+ #
+ p_mtu = (Ether(src=self.pg0.remote_mac,
+ dst=self.pg0.local_mac) /
+ IP(src=self.pg0.remote_ip4,
+ dst=self.pg1.remote_ip4,
+ ttl=10) /
+ UDP(sport=1234, dport=1234) /
+ Raw('\xa5' * 2000))
+
+ self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, 1500)
+
+ rx = self.send_and_expect(self.pg0, p_mtu * 65, self.pg0)
+ rx = rx[0]
+ icmp = rx[ICMP]
+
+ self.assertEqual(icmptypes[icmp.type], "dest-unreach")
+ self.assertEqual(icmpcodes[icmp.type][icmp.code],
+ "fragmentation-needed")
+ self.assertEqual(icmp.src, self.pg0.remote_ip4)
+ self.assertEqual(icmp.dst, self.pg1.remote_ip4)
+
+ self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, 2500)
+ rx = self.send_and_expect(self.pg0, p_mtu * 65, self.pg1)
+
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)