From eaaea73bf128ec4ce7ab38a32391a68f2c885773 Mon Sep 17 00:00:00 2001
From: Jeff Weston <Jeffery.Weston@nrl.navy.mil>
Date: Fri, 19 May 2023 15:53:20 -0400
Subject: [PATCH] Change NORM to set TTL using MULTICAST_HOPS sockopt (#4552)

* Change NORM to set TTL using MULTICAST_HOPS instead of hard-coding.  Changes default TTL from 255 to 1.
---
 src/norm_engine.cpp | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/norm_engine.cpp b/src/norm_engine.cpp
index cc77b8b3..fbda2f3f 100644
--- a/src/norm_engine.cpp
+++ b/src/norm_engine.cpp
@@ -133,10 +133,7 @@ int zmq::norm_engine_t::init (const char *network_, bool send, bool recv)
     // There's many other useful NORM options that could be applied here
     if (!NormIsUnicastAddress (addr)) {
         // These only apply for multicast sessions
-        //NormSetTTL(norm_session, options.multicast_hops);  // ZMQ default is 1
-        NormSetTTL (
-          norm_session,
-          255); // since the ZMQ_MULTICAST_HOPS socket option isn't well-supported
+        NormSetTTL (norm_session, options.multicast_hops);
         NormSetRxPortReuse (
           norm_session,
           true); // port reuse doesn't work for non-connected unicast