Opened 5 years ago

Closed 5 years ago

#598 closed Bug / Defect (notabug)

v2.3.8 :: No IPv6-only tunnel is working without IPv4 address space defined

Reported by: mg16373 Owned by:
Priority: major Milestone:
Component: Generic / unclassified Version: OpenVPN 2.3.8 (Community Ed)
Severity: Not set (select this one, unless your'e a OpenVPN developer) Keywords: IPv6 Only Tunnel
Cc:

Description

In some situation a IPv6-only Tunnel is helpful (based on a initiated IPv4 connection) but currently OpenVPN works only when IPv4 addresses are configured. Without IPv4 the local Tunnel-Interface has no addresses. On Ubuntu 14 the Network Manager reports a "Incorrect Configuration" and aborts.

Background:
Friends and customers have only IPv4 address space available. With a OpenVPN-based solution I want to tunnel a IPv6 prefix and a ::/0 route to this client(s). The previous installed IPv4 default route will not override by a default route of the IPv6-only OpenVPN connection.

It's a bug or a feature? ;-) Thank you for a answer.

-Markus

Change History (1)

comment:1 Changed 5 years ago by Gert Döring

Resolution: notabug
Status: newclosed

This is intentional. OpenVPN 2.3 (and most likely 2.4) will not work IPv6-only.

But this is not a problem. Just use an IPv4 private network on the tun interface that you do not use for anything else, and do not send any IPv4 routes into the tun - so you can still have your IPv6-default on the VPN, and no IPv4 (besides the tun subnet).

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