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Port numbers reused after Reset

mx flag

Recently in our production Kubernetes cluster, we saw a lot of outbound reset connection, after some troubleshooting, we have below network flow captured.

Network Capture

we are really confused by this flow. in this flow.

  1. from localport 33890, a new connection is created and sync packet is send out
  2. for whatever reason, remote reset this connection.

then here comes the confusing part, all sync packs sent from this port are considered to be Port-Reused.

  1. there are all new connections, it is not TCP re-transimssion.
  2. the time difference can be very big, eg, between 35s to 144 seconds, there are more than 100s, which is bigger than the normal 2msl time(60s)

so, can someone explain why we observer this "port numbers reused" in wireshark? is it a software bug or something else?

mangohost

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