Yeah, annoying oversight on the side of the reviewer... good catch.

The extraction actually works fine, just the sanity check always
complains..

   Aug 13 14:25:56 gentoo tun-udp-p2mp-hash-defscript[11410]: Warning: reported 
maximum MTU from client (0) is lower than MTU used on the server (1500). Add 
tun-mtu-max 1500 to client configuration.

now it's back :-) - testing with a client that has been modified to send
IV_MTU=1300

  Aug 13 16:35:46 gentoo tun-udp-p2mp[13468]: 
cron2-freebsd-tc-amd64-25/udp6:194.97.140.21:40913 Warning: reported maximum 
MTU from client (1300) is lower than MTU used on the server (1400). Add 
tun-mtu-max 1400 to client configuration.

check!

Your patch has been applied to the master branch.

commit 800ba2cfccf2173c466f9b57381bb6244110117f
Author: Arne Schwabe
Date:   Thu Aug 13 07:58:30 2026 +0200

     Fix extracting IV_MTU

     Signed-off-by: Arne Schwabe <[email protected]>
     Acked-by: Gert Doering <[email protected]>
     Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1842
     Message-Id: <[email protected]>
     URL: 
https://www.mail-archive.com/[email protected]/msg38291.html
     Signed-off-by: Gert Doering <[email protected]>


--
kind regards,

Gert Doering



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