From 6d7cbbecc893ea725fdd6fc9c54c4f9ac16e647d Mon Sep 17 00:00:00 2001
From: bnewbold <bnewbold@robocracy.org>
Date: Mon, 10 Sep 2012 23:36:17 +0200
Subject: robustness changes

---
 networking/ipv6vpn.page | 39 +++++++++++++++++++++++++++++----------
 1 file changed, 29 insertions(+), 10 deletions(-)

diff --git a/networking/ipv6vpn.page b/networking/ipv6vpn.page
index de33f38..129f15d 100644
--- a/networking/ipv6vpn.page
+++ b/networking/ipv6vpn.page
@@ -14,6 +14,16 @@ ways.
 [http://library.linode.com/networking/openvpn/debian-6-squeeze](linode library)
 instructions, but heavily modified)
 
+First off, make sure you have IPv6 correctly configured on the VPS. I added the
+following to /etc/network/interfaces:
+
+    # The primary network interface
+    allow-hotplug eth0
+    iface eth0 inet dhcp
+        up /sbin/ip -6 addr add $VPN_IPV6_ADDR/64 dev eth0
+        up /sbin/ip -6 route add default via fe80::1 dev eth0
+        down /sbin/ip -6 addr del $VPN_IPV6_ADDR/64 dev eth0
+
 On the remote host (runing debian wheezy), as root:
 
     apt-get install openvpn udev
@@ -47,8 +57,23 @@ Then copy the following to /etc/openvpn/server.conf:
     persist-tun
     status openvpn-status.log
     verb 3
-    ;ifconfig fec0::1 fec0::2
+    ;ifconfig fec0::1 fec0::2 # IPv6 addrs not supported...
     ;route 2600:3c03:e001:1301::/64 fec0::2
+    script-security 2
+    up-restart
+    up-delay
+    up /usr/local/bin/ipv6_tunnel_up.sh
+
+Create /usr/local/bin/ipv6_tunnel_up.sh:
+
+Then make it executable:
+
+    chmod +x /usr/local/bin/ipv6_tunnel_up.sh
+
+Uncomment (or add) the following line in /etc/sysctl.conf (also execute this
+with ```sysctl -w`` the first time around):
+
+    net.ipv6.conf.all.forwarding=1
 
 Add openvpn to the default service group and bring up the daemon:
 
@@ -56,15 +81,6 @@ Add openvpn to the default service group and bring up the daemon:
     /etc/init.d/openvpn stop
     /etc/init.d/openvpn start
 
-The tun0 interface comes up "bare" and not active by default; the following
-should be added to a post-init script, but for now just run it by hand:
-
-    sysctl -w net.ipv6.conf.all.forwarding=1
-    ip -6 route add default via fe80::1 dev eth0
-    ip link set tun0 up
-    ip addr add fec0::1/96 dev tun0
-    ip route add $SITE_PREFIX::/64 via fec0::2 dev tun0
-
 ## On-site OpenWRT router
 
 You'll need to have the certificates generated above available locally.
@@ -175,3 +191,6 @@ The lazy trick was to just use the OpenWRT LuCi interface and set up a wan6
 firewall interface (enclosing tun0) instead of trying to do everything with the
 ``ip`` command.
 
+# Reference
+
+After writing this, I found: https://www.zagbot.com/openvpn_ipv6_tunnel.html
-- 
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