How does pppoe-wan get its IP?
You may not be able to do much about that, but you can hint which IPv6
an interface gets using the assignment length, hint and prefix settings.
I don't use openvpn, but perhaps it has something like this? I guess it
would try to pick a source IP with the 'lowest' IPv6 from an available /64?
On 2023-12-15 11:08, e9hack wrote:
Hi,
I've trouble with openvpn over ipv6. It isn't possible to connect to my
router from outside via ipv6, because openvpn uses the wrong ipv6
address as source. I get from my provider two prefixes (a 56 and 64
bit). The wan interface gets assigned a random address from the 64 bit
prefix. I'm using 3 local interfaces that have been assigned a 64-bit
prefix derived from the 56-bit prefix. This are the ipv6 global
addresses on my interfaces:
pppoe-wan Link encap:Point-to-Point Protocol
inet6 addr: 2003:cccc:ddff:1242:bbbb:bbbb:bbbb:bbbb/64
Scope:Global
br-lan Link encap:Ethernet HWaddr 50:xx:xx:xx:xx:xx
inet6 addr: 2003:cccc:dd12:27ac::1/64 Scope:Global
br-guest1 Link encap:Ethernet HWaddr 56:xx:xx:xx:xx:xx
inet6 addr: 2003:cccc:dd12:27e1::1/64 Scope:Global
br-guest2 Link encap:Ethernet HWaddr 5A:xx:xx:xx:xx:xx
inet6 addr: 2003:cccc:dd12:27e2::1/64 Scope:Global
openvpn uses all the time the address from br-guest1 as source address.
I did monitor this with tcpdump:
root@OpenWRT:~# tcpdump -n -i pppoe-wan ip6 and port 1194
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on pppoe-wan, link-type LINUX_SLL (Linux cooked v1), snapshot
length 262144 bytes
09:20:06.656182 IP6 2a01:eeee:ffff:56b6:aaaa:aaaa:aaaa:aaaa.62668 >
2003:cccc:ddff:1242:bbbb:bbbb:bbbb:bbbb.1194: UDP, length 86
09:20:06.657636 IP6 2003:cccc:dd12:27e1::1.1194 >
2a01:eeee:ffff:56b6:aaaa:aaaa:aaaa:aaaa.62668: UDP, length 98
09:20:21.294559 IP6 2a01:eeee:ffff:56b6:aaaa:aaaa:aaaa:aaaa.62668 >
2003:cccc:ddff:1242:bbbb:bbbb:bbbb:bbbb.1194: UDP, length 86
09:20:21.296070 IP6 2003:cccc:dd12:27e1::1.1194 >
2a01:eeee:ffff:56b6:aaaa:aaaa:aaaa:aaaa.62668: UDP, length 98
09:20:50.938655 IP6 2a01:eeee:ffff:56b6:aaaa:aaaa:aaaa:aaaa.62668 >
2003:cccc:ddff:1242:bbbb:bbbb:bbbb:bbbb.1194: UDP, length 86
09:20:50.939972 IP6 2003:cccc:dd12:27e1::1.1194 >
2a01:eeee:ffff:56b6:aaaa:aaaa:aaaa:aaaa.62668: UDP, length 98
What can I change, that openvpn uses the ipv6 address from the wan
interface?
Regards,
Hartmut
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