From: Alan T. DeKok <aland@freeradius.org>
Date: Tue, 1 Sep 2009 12:49:39 +0000 (+0200)
Subject: Set DF flag for packets from the server, too
X-Git-Tag: release_2_1_7~25
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e28aced9813fe0f0f6235ace6ba5eeb9d6bdbd1;p=thirdparty%2Ffreeradius-server.git

Set DF flag for packets from the server, too
---

diff --git a/src/main/listen.c b/src/main/listen.c
index 140506d691e..372bd769edd 100644
--- a/src/main/listen.c
+++ b/src/main/listen.c
@@ -1506,6 +1506,31 @@ static int listen_bind(rad_listen_t *this)
 	}
 #endif /* HAVE_STRUCT_SOCKADDR_IN6 */
 
+
+	if (sock->ipaddr.af == AF_INET) {
+		UNUSED int flag;
+		
+#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
+		/*
+		 *	Disable PMTU discovery.  On Linux, this
+		 *	also makes sure that the "don't fragment"
+		 *	flag is zero.
+		 */
+		flag = IP_PMTUDISC_DONT;
+		setsockopt(this->fd, IPPROTO_IP, IP_MTU_DISCOVER,
+			   &flag, sizeof(flag));
+#endif
+
+#if defined(IP_DONTFRAG)
+		/*
+		 *	Ensure that the "don't fragment" flag is zero.
+		 */
+		flag = 0;
+		setsockopt(this->fd, IPPROTO_IP, IP_DONTFRAG,
+			   &flag, sizeof(flag));
+#endif
+	}
+
 	/*
 	 *	May be binding to priviledged ports.
 	 */