diff --git a/ChangeLog b/ChangeLog
index 9a17b25ae..c2e6cadc6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+20091107
+ - (djm) [channels.c misc.c misc.h sshd.c] add missing setsockopt() to
+   set IPV6_V6ONLY for local forwarding with GatwayPorts=yes. Unify
+   setting IPV6_V6ONLY behind a new function misc.c:sock_set_v6only()
+   report and fix from jan.kratochvil AT redhat.com
+
 20091107
  - (dtucker) [authfile.c] Fall back to 3DES for the encryption of private
     keys when built with OpenSSL versions that don't do AES.
diff --git a/channels.c b/channels.c
index e8b8aa07e..22e7f628b 100644
--- a/channels.c
+++ b/channels.c
@@ -2577,6 +2577,8 @@ channel_setup_fwd_listener(int type, const char *listen_addr,
 		}
 
 		channel_set_reuseaddr(sock);
+		if (ai->ai_family == AF_INET6)
+			sock_set_v6only(sock);
 
 		debug("Local forwarding listening on %s port %s.",
 		    ntop, strport);
@@ -3108,13 +3110,8 @@ x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
 					continue;
 				}
 			}
-#ifdef IPV6_V6ONLY
-			if (ai->ai_family == AF_INET6) {
-				int on = 1;
-				if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
-					error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
-			}
-#endif
+			if (ai->ai_family == AF_INET6)
+				sock_set_v6only(sock);
 			if (x11_use_localhost)
 				channel_set_reuseaddr(sock);
 			if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
diff --git a/misc.c b/misc.c
index 143dbf0e2..4dc152310 100644
--- a/misc.c
+++ b/misc.c
@@ -849,3 +849,14 @@ ms_to_timeval(struct timeval *tv, int ms)
 	tv->tv_usec = (ms % 1000) * 1000;
 }
 
+void
+sock_set_v6only(int s)
+{
+#ifdef IPV6_V6ONLY
+	int on = 1;
+
+	debug3("%s: set socket %d IPV6_V6ONLY", __func__, s);
+	if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1)
+		error("setsockopt IPV6_V6ONLY: %s", strerror(errno));
+#endif
+}
diff --git a/misc.h b/misc.h
index 5da170d2f..e26b0aaff 100644
--- a/misc.h
+++ b/misc.h
@@ -35,6 +35,7 @@ char	*tohex(const void *, size_t);
 void	 sanitise_stdfd(void);
 void	 ms_subtract_diff(struct timeval *, int *);
 void	 ms_to_timeval(struct timeval *, int);
+void	 sock_set_v6only(int);
 
 struct passwd *pwcopy(struct passwd *);
 const char *ssh_gai_strerror(int);
diff --git a/sshd.c b/sshd.c
index 13a455d1f..04d8f9fa0 100644
--- a/sshd.c
+++ b/sshd.c
@@ -979,15 +979,9 @@ server_listen(void)
 		    &on, sizeof(on)) == -1)
 			error("setsockopt SO_REUSEADDR: %s", strerror(errno));
 
-#ifdef IPV6_V6ONLY
 		/* Only communicate in IPv6 over AF_INET6 sockets. */
-		if (ai->ai_family == AF_INET6) {
-			if (setsockopt(listen_sock, IPPROTO_IPV6, IPV6_V6ONLY,
-			    &on, sizeof(on)) == -1)
-				error("setsockopt IPV6_V6ONLY: %s",
-				    strerror(errno));
-		}
-#endif
+		if (ai->ai_family == AF_INET6)
+			sock_set_v6only(listen_sock);
 
 		debug("Bind to port %s on %s.", strport, ntop);