OpenVPN server-ipv6 breaks server's IPv6 connecivity

March 24, 2018 601 views
VPN Debian

Hi,
as I added a random ULA subnet to my OpenVPN configuration, the IPv6 breaks if the OVPN server is started.

ovpn server stopped

root@debian-s-1vcpu-1gb-fra1-01:/etc/openvpn# ping6 2001:4860:4860::8888
PING 2001:4860:4860::8888(2001:4860:4860::8888) 56 data bytes
64 bytes from 2001:4860:4860::8888: icmpseq=1 ttl=61 time=0.649 ms
64 bytes from 2001:4860:4860::8888: icmp
seq=2 ttl=61 time=0.668 ms
^C
--- 2001:4860:4860::8888 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1026ms
rtt min/avg/max/mdev = 0.649/0.658/0.668/0.027 ms

ovpn started

root@debian-s-1vcpu-1gb-fra1-01:/etc/openvpn# systemctl start openvpn@server
root@debian-s-1vcpu-1gb-fra1-01:/etc/openvpn# ping6 2001:4860:4860::8888
PING 2001:4860:4860::8888(2001:4860:4860::8888) 56 data bytes
^C
--- 2001:4860:4860::8888 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3066ms

The only line I've changed in my ovpn.conf is the following, which is a random ULA subnet:
server-ipv6 fdb0:e445:f404:83b1::/64

Any clues?

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