Forwarding IPv6 traffic
How can I forward IPv6 traffic from my tun0 interface to the eth0 interface?
ifconfig:
eth0 Link encap:Ethernet HWaddr 00:16:3E:12:77:54
inet addr:208.111.39.160 Bcast:208.111.39.255 Mask:255.255.255.0
inet6 addr: 2607:f740:0:3f::eda/64 Scope:Global
inet6 addr: fe80::216:3eff:fe12:7754/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:65590 errors:0 dropped:499 overruns:0 frame:0
TX packets:40111 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13246038 (12.6 MiB) TX bytes:28807669 (27.4 MiB)
Interrupt:29
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255
inet6 addr: 2607:f740:44:22::8/64 Scope:Global
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:16876 errors:0 dropped:0 overruns:0 frame:0
TX packets:16504 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:2235766 (2.1 MiB) TX bytes:7680377 (7.3 MiB)
I have forwarding enabled:
[root@baobei ~]# sysctl net.ipv6.conf.all.forwarding
net.ipv6.conf.all.forwarding = 1
Firewall:
ip6tables -F INPUT
ip6tables -F FORWARD
ip6tables -F OUTPUT
ip6tables -F
ip6tables -P INPUT ACCEPT
ip6tables -P FORWARD ACCEPT
ip6tables -P OUTPUT ACCEPT
echo -n "1" >/proc/sys/net/ipv6/conf/all/forwarding
echo -n "1" >/proc/sys/net/ipv6/conf/all/proxy_ndp
echo -n "0" >/proc/sys/net/ipv6/conf/all/autoconf
echo -n "0" >/proc/sys/net/ipv6/conf/all/accept_ra
ip6tables -A INPUT -p icmpv6 -j ACCEPT
ip6tables -A FORWARD -m state --state NEW -i tun0 -o eth0 -s 2607:f740:44:22::/64 -j ACCEPT
ip6tables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
Routes:
unreachable ::/96 dev lo metric 1024 error -101
unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 error -101
unreachable 2002:a00::/24 dev lo metric 1024 error -101
unreachable 2002:7f00::/24 dev lo metric 1024 error -101
unreachable 2002:a9fe::/32 dev lo metric 1024 error -101
unreachable 2002:ac10::/28 dev lo metric 1024 error -101
unreachable 2002:c0a8::/32 dev lo metric 1024 error -101
unreachable 2002:e000::/19 dev lo metric 1024 error -101
2607:f740:0:3f::/64 dev eth0 proto kernel metric 256
2607:f740:44:22::/64 dev tun0 proto kernel metric 256
unreachable 3ffe:ffff::/32 dev lo metric 1024 error -101
fe80::/64 dev eth0 proto kernel metric 256
fe80::/64 dev tun0 proto kernel metric 256
default via 2607:f740:0:3f::1 dev eth0 metric 1
However ipv6 packets which arrive at the tun0 interface are not routed to the eth0 interface. Thanks for any help, suggestions.
This is a simple question of routing. Your routing table, doesn't have any routes to direct traffic over the tun0 interface, so nothing gets forwarded that way.
I gather you are using OpenVPN. As far as I know right now, the IPv6 support for OpenVPN doesn't include an IPv6 equivalent of the redirect-gateway
option. You probably need to add your own routes with route-ipv6
statements pushed from the server.