Is there any possibility that the port deleted by VPP can notify Nginx through a certain mechanism, so that Nginx will no longer reuse this deleted port to send data?
Best regards, Huiliang Guo Florin Coras via lists.fd.io <[email protected]> 于2025年11月28日周五 04:43写道： > Hi, > > > On Nov 26, 2025, at 11:39 PM, Guo Huiliang via lists.fd.io <huiliang.guo= > [email protected]> wrote: > > When I use Nginx as a reverse proxy, Nginx acts as a client and creates a > TCP connection on a specific port. In VPP's TCP protocol stack, there is > tcp_handle_cleanups—when the connection times out, it deletes the session > and the connection. > > > This is the normal path for all connection cleanups. > > However, after the connection is deleted, when the Nginx client initiates > a new connection using the same port again, session_lookup_connection_wt4 will > throw an error stating that the connection cannot be found, resulting in > communication interruption. How to resolve this issue? > > > If this is a connect port reuse, i.e., src and dst port are reused, it’s > probably not properly supported today. In fact, I’d expect connect to be > refused with port in use due to error in transport_alloc_local_endpoint. > This has been on our todo list for a while. > > If however the local port is not reused, this needs more debugging. Maybe > related to the fib used. > > Regards, > Florin > > > the log as below: > Nov 27 07:13:57 ubuntu vpp[2224818]: tcp_handle_cleanups:1313: > opaque_conn_id: 3081261440 > Nov 27 07:13:57 ubuntu vpp[2224818]: session_transport_delete_notify:1201: > session index 160 delete, session state: 10, opaque_conn_id: 3081261440 > Nov 27 07:13:57 ubuntu vpp[2224818]: session_delete:284: session index 160 > delete > Nov 27 07:13:57 ubuntu vpp[2224818]: session_lookup_del_session:406: > [Preparing to delete listening connection | Local listening address= > 172.16.102.211:16143 | Session index=160 | Peer listening address= > 118.195.243.98:443] > Nov 27 07:13:59 ubuntu vpp[2224818]: session_lookup_connection_wt4:1023: > session_lookup_connection_wt4: Listening connection not found (Local > address: 172.16.102.211:16143, Protocol=0) > Nov 27 07:13:59 ubuntu vpp[2224818]: session_lookup_connection_wt4:1027: > session_lookup_connection_wt4: Matching connection not found (Quadruple: > 172.16.102.211:16143 -> 118.195.243.98:443, Protocol=0, FIB index=1, > Namespace index=1) > > > Best regards, > Huiliang Guo > > > > > > > >
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