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