From a1f0ea770e86bcfa765d01cddb74f05ec327f902 Mon Sep 17 00:00:00 2001
From: "iguerNL@Functori" <iguer@functori.com>
Date: Mon, 9 Dec 2024 08:52:47 +0100
Subject: [PATCH] Octez-p2p: set SO_KEEPALIVE to true for connections

---
 src/lib_p2p/p2p_fd.ml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/lib_p2p/p2p_fd.ml b/src/lib_p2p/p2p_fd.ml
index 6ca4160a7a6d..56f39eadff06 100644
--- a/src/lib_p2p/p2p_fd.ml
+++ b/src/lib_p2p/p2p_fd.ml
@@ -170,6 +170,14 @@ let create_listening_socket ?(reuse_port = false) ~backlog
       let sock = raw_socket () in
       (if reuse_port then Lwt_unix.(setsockopt sock SO_REUSEPORT true)) ;
       Lwt_unix.(setsockopt sock SO_REUSEADDR true) ;
+
+      (* By setting [SO_KEEPALIVE] to [true], the socket is configured to send
+         periodic keep-alive probes to verify that the connection is still
+         active.
+
+         It reset (send TCP RST message and close) if the peer is
+         unresponsive. *)
+      Lwt_unix.(setsockopt sock SO_KEEPALIVE true) ;
       let*! () =
         Lwt_unix.bind
           sock
-- 
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