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openwrt-xburst/openwrt/package/l2tpd/patches/05-df-disable.patch
nico 707f1f6c81 Prevent l2tpd from using PMTU discovery, setting the DF bit on all outgoing UDP packets (closes: #471)
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@3621 3c298f89-4303-0410-b956-a3cf2f4a3e73
2006-04-12 00:17:43 +00:00

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918 B
Diff

Patch to stop l2tpd setting the DF bit on each of the packets it sends.
Apart from not being useful with L2TP, this also prevents interoperating
with Cisco IOS over IPSEC.
--- l2tpd-0.70-pre20031121.orig/network.c.orig 2006-04-11 08:50:38.000000000 +0100
+++ l2tpd-0.70-pre20031121.orig/network.c 2006-04-11 08:58:18.000000000 +0100
@@ -56,6 +56,18 @@
__FUNCTION__);
return -EINVAL;
};
+#ifdef IP_MTU_DISCOVER
+#ifdef IP_PMTUDISC_DONT
+ {
+ /* Don't set DF bit on outbound packets */
+ int val = IP_PMTUDISC_DONT;
+ if (setsockopt(server_socket, IPPROTO_IP, IP_MTU_DISCOVER, &val, sizeof(val)) < 0)
+ {
+ log (LOG_LOG, "Failed to disable PMTU discovery\n");
+ }
+ }
+#endif
+#endif
/* L2TP/IPSec: Set up SA for listening port here? NTB 20011015
*/
if (bind (server_socket, (struct sockaddr *) &server, sizeof (server)))