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On Jun 13, 2022, at 08:27, Sharma, Amit via lustre-discuss <<a href="mailto:lustre-discuss@lists.lustre.org" class="">lustre-discuss@lists.lustre.org</a>> wrote:<br class="">
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Hi Team,</div>
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can you please help me which ephemeral TCP ports need to be opened for luster inter server communication.</div>
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Regards,</div>
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Amit</div>
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<div>There are several answers here:</div>
<div>- the LNet socklnd acceptor listens on port 988 for *new* incoming connections and needs to be open</div>
<div>- socklnd acceptor by default only allows connections *from* ("secure") port 988, unless "accept=all" is used</div>
<div>- after initial TCP connection establishment, *each* new client or server connection will use 3 TCP sockets</div>
<div> (or more, see LU-12815 for details) on *other* ports, so these cannot be blocked outright, but do not need</div>
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<div>*Most* of the port 988 connections will be client->server, but occasionally if there is a network problem and the client connection is dropped, then server->client connections may be initiated to cancel a lock or similar. If this server->client connection
cannot be established, then the client may be evicted.</div>
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<div>Cheers, Andreas</div>
<div>--</div>
<div>Andreas Dilger</div>
<div>Lustre Principal Architect</div>
<div>Whamcloud</div>
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