I'm trying to set up an IPv6-enabled OpenVPN server. The provider only gave me a /64 subnet : 2a06:1700:1::640/64.
Here is the OpenVPN configuration :
port 1194
proto udp
dev tun0
server-ipv6 2a06:1700:1::640:0/112
ca ca.crt
cert server.crt
key server.key
dh dh.pem
user nobody
group nogroup
topology subnet
server 10.8.0.0 255.255.255.0
cipher AES-256-CBC
auth SHA512
tls-version-min 1.2
tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
push "route-ipv6 2000::/3"
push "redirect-gateway def1 bypass-dhcp"
push "dhcp-option DNS 80.67.169.12"
push "dhcp-option DNS 80.67.169.40"
keepalive 10 120
persist-key
persist-tun
crl-verify crl.pem
tls-server
tls-auth tls-auth.key 0
Clients can get an IPv6 address, for example, my Android phone had 2a06:1700:1::640:1000. But they can't access the IPv6 outside world. And they can't be accessed either.
I did set up ndppd :
proxy eth0 {
router yes
timeout 500
ttl 30000
rule 2a06:1700:1::640:0/112 {
auto
}
}
I used tcpdump ip6 -i eth0 while pinging 2a06:1700:1::640:1000 from the outside :
03:22:05.510078 IP6 laptop > 2a06:1700:1::640:1000: ICMP6, echo request, seq 1390, length 64
03:22:06.519622 IP6 laptop > 2a06:1700:1::640:1000: ICMP6, echo request, seq 1391, length 64
03:22:07.527548 IP6 laptop > 2a06:1700:1::640:1000: ICMP6, echo request, seq 1392, length 64
03:22:08.515457 IP6 laptop > 2a06:1700:1::640:1000: ICMP6, echo request, seq 1393, length 64
Using tcpdump ip6 -i tun0 shows nothing about that ping. And connections made from the OpenVPN client to the outside IPv6 world, let's say ping ipv6.google do appear in tcpdump ip6 -i tun0 but not in tcpdump ip6 -i eth0. This looks like a routing problem, but I can't figure out what exactly.
ip -6 route :
2a06:1700:1::640:0/112 dev tun0 proto kernel metric 256
2a06:1700:1::/64 dev eth0 proto kernel metric 256
fe80::/64 dev eth0 proto kernel metric 256
default via 2a06:1700:1:: dev eth0 metric 1024
route -6 :
Kernel IPv6 routing table
Destination Next Hop Flag Met Ref Use If
::1/128 :: U 256 0 0 lo
2a06:1700:1::640:0/112 :: U 256 1 0 tun0
2a06:1700:1::/64 :: U 256 0 1 eth0
fe80::/64 :: U 256 1 0 eth0
::/0 2a06:1700:1:: UG 1024 0 0 eth0
::/0 :: !n -1 1 1914 lo
::1/128 :: Un 0 1 4 lo
2a06:1700:1::/128 :: Un 0 1 0 lo
2a06:1700:1::640/128 :: Un 0 1 0 lo
2a06:1700:1::640:0/128 :: Un 0 1 0 lo
2a06:1700:1::640:1/128 :: Un 0 1 60 lo
fe80::/128 :: Un 0 1 0 lo
fe80::250:56ff:fe96:7322/128 :: Un 0 1 62 lo
ff00::/8 :: U 256 5 0 eth0
ff00::/8 :: U 256 1 0 tun0
::/0 :: !n -1 1 1914 lo
How can I make eth0 and tun0 talk to each other ?
Thank you very much !
IPv6 addresses have been anonymized
