From: Numan Siddique <[email protected]>
Recently added multinode test - "ovn multinode stateless NAT - icmp4
PMTUD inner src un-NAT" is failing in CI. During debugging found that when
1100 size packet is sent out, the namespace 'sw0p1' receives the below
frag needed icmp error message
[root@ovn-chassis-1 /]# ip netns exec sw0p1 ping -c 10 -i 0.5 -s 1100 -M do
172.20.1.2
PING 172.20.1.2 (172.20.1.2) 1100(1128) bytes of data.
>From 172.20.1.2 icmp_seq=1 Frag needed and DF set (mtu = 942)
...
Where as the test expects (mtu = 1100) message. Further debugging found
that this frag needed is sent by 'ovn-chassis-1' itself. Where as
I was expecting the packet to be tunnelled to 'ovn-gw-1' and the external
interface 'ovn-ext0' namespace networking stack to generate the
icmp error msg.
Looks like some previously generated icmp need frag is learnt
(from an earlier test) and the host kernel in ovn-chassis-1 is
probably adding a route exception with mtu 942.
Bringing down and then up of the interface eth1 fixes the
issue.
The test failure can also be reproduced locally by runing
the same test twice. The test fails the second time.
Fixes: e44e18f46ace ("northd: Emit inner-IP rewrite flow for stateless DNAT.")
Signed-off-by: Numan Siddique <[email protected]>
---
tests/multinode-macros.at | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/tests/multinode-macros.at b/tests/multinode-macros.at
index 4a74d51277..96dba4ff5e 100644
--- a/tests/multinode-macros.at
+++ b/tests/multinode-macros.at
@@ -234,6 +234,12 @@ cleanup_multinode_resources_by_nodes() {
for i in $(m_as $c ovs-vsctl --bare --columns name list port | grep
patch); do
m_as $c ovs-vsctl del-port $i;
done
+
+ # Bring down and then up the eth1 interface.
+ # Its possible that previous test runs may have some cached routes
+ # which could affect the other tests.
+ m_as $c ip link set eth1 down
+ m_as $c ip link set eth1 up
done
}
--
2.55.0
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