Re: [Openvpn-users] OpenVPN tunnel stopped working (no traffic) after upgrade to OpenVPN 2.7 (Fedora 44)

Gert Doering <[email protected]> Fri, 15 May 2026 08:22:29 +0200

Newsgroups	gmane.network.openvpn.devel
Message-ID	<[email protected]>

Hi,

On Fri, May 15, 2026 at 12:31:33AM +0200, Piotr Dobrogost wrote:
> I did not, but I repeated the steps now, and ping does not work.
> Btw, I found out someone else a few days ago had the same problem on
> Windows and adding disable-dco in a config also fixed the issue.

This is likely a red herring.  There are various reasons why "using DCO"
might fail (different code paths, options negotiated that are incompatible
with DCO but not properly caught, bugs) but "windows DCO" is so very
different from "Linux DCO" that it's close to impossible that it's the
same cause.

(Windows DCO, for example, uses more modern APIs to configure IP addresses
and DNS than the old TAP6 driver, and some setups happen to use configs
that are not really what we expected and "happened to work" with the old
method... but on Linux, everything is netlink)

gert
-- 
"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             [email protected]

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