Commits on Apr 16, 2024

1. Fix NodeNetworkPolicy e2e test failure …

   In NodeNetworkPolicy e2e tests, we have the following cases:
   
   - Node to Node. We deploy two hostNetwork Pods on different Nodes.
   - Node to Pods. We deploy a hostNetwork Pod on a Node and two
     non-hostNetwork Pods on different Nodes.
   
   For the case of Node to Pods, after creating test Pods, a full mesh
   probing is run to ensure that all Pods can be reachable from each
   other. However, the UDP probing from a non-hostNetwork Pod to the
   hostNetwork Pod deployed on the same Node will get a failure. The
   reason is that due to UDP's connectionless nature, the reply traffic
   may use a source IP address determined by routing decisions or outgoing
   interfaces, rather than the destination IP address used in request
   traffic. This can lead to probing failures for the UDP server.
   
   To resolve the issue, we ensure that the UDP server listens exclusively
   on Node IPs when the test Pod is a host network Pod.
   
   Signed-off-by: Hongliang Liu <lhongliang@vmware.com>

   

   hongliangl committed Apr 16, 2024
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