From 668e4a1dfbea398410f86d803fadc733f4e5ed26 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Javier=20Jaramago=20Fern=C3=A1ndez?=
 <jaramago.fernandez.javier@gmail.com>
Date: Tue, 16 Mar 2021 10:21:37 +0000
Subject: [PATCH] Closes #1614: Added extra logging suggesting solution when
 'bind()' fails due to 'EADDRNOTAVAIL'

---
 lib/network.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/network.cpp b/lib/network.cpp
index adbba27c3..63dc1e575 100644
--- a/lib/network.cpp
+++ b/lib/network.cpp
@@ -51,6 +51,13 @@ int listen_on_port(char *ip, uint16_t port, int backlog, bool reuseport) {
                 if (bind(sd, next->ai_addr, next->ai_addrlen) == -1) {
                         //if (errno != EADDRINUSE) {
                                 proxy_error("bind(): %s\n", strerror(errno));
+                                // in case of 'EADDRNOTAVAIL' suggest a solution to user. See #1614.
+                                if (errno == EADDRNOTAVAIL) {
+                                    proxy_info(
+                                       "Trying to 'bind()' failed due to 'EADDRNOTAVAIL'. If trying to bind to a "
+                                       "non-local IP address, make sure 'net.ipv4.ip_nonlocal_bind' is set to '1'\n"
+                                    );
+                                }
                                 close(sd);
                                 freeaddrinfo(ai);
                                 return -1;