openwrt/package/l2tpd/patches/05-df-disable.patch

   1 Patch to stop l2tpd setting the DF bit on each of the packets it sends.
   2 Apart from not being useful with L2TP, this also prevents interoperating
   3 with Cisco IOS over IPSEC.
   4
   5 --- l2tpd-0.70-pre20031121.orig/network.c.orig  2006-04-11 08:50:38.000000000 +0100
   6 +++ l2tpd-0.70-pre20031121.orig/network.c       2006-04-11 08:58:18.000000000 +0100
   7 @@ -56,6 +56,18 @@
   8               __FUNCTION__);
   9          return -EINVAL;
  10      };
  11 +#ifdef IP_MTU_DISCOVER
  12 +#ifdef IP_PMTUDISC_DONT
  13 +    {
  14 +        /* Don't set DF bit on outbound packets */
  15 +        int val = IP_PMTUDISC_DONT;
  16 +        if (setsockopt(server_socket, IPPROTO_IP, IP_MTU_DISCOVER, &val, sizeof(val)) < 0)
  17 +        {
  18 +            log (LOG_LOG, "Failed to disable PMTU discovery\n");
  19 +        }
  20 +    }
  21 +#endif
  22 +#endif
  23      /* L2TP/IPSec: Set up SA for listening port here?  NTB 20011015
  24       */
  25      if (bind (server_socket, (struct sockaddr *) &server, sizeof (server)))