Hi Alex,
On 15/09/17 18:54, Alex K wrote:
Hi all,
I am receiving the below warning on server and client side when setting up the
tunnel:
server:
Fri Sep 15 16:45:14 2017 172.30.0.180:44304 <http://172.30.0.180:44304> WARNING: 'link-mtu' is used inconsistently,
local='link-mtu 1562', remote='link-mtu 1530'
client:
Fri Sep 15 16:45:14 2017 us=87436 WARNING: 'link-mtu' is used inconsistently,
local='link-mtu 1530', remote='link-mtu 1562'
and further down on client side:
Fri Sep 15 16:45:15 2017 us=282768 OPTIONS IMPORT: adjusting link_mtu to 1629
I have on server side:
tun-mtu 1500
fragment 1360
mssfix
and on client side exactly the same:
tun-mtu 1500
fragment 1360
mssfix
The tun interfaces on both sides show as 1500 with ifconfig.
Why is this case? I cannot recall seeing such warning on openvpn 2.2.1-8.
I can provide more details if needed.
the link-mtu size also depends on the cipher and auth used ; are you using NCP at all (i.e. do you explicitly specify
'disable-ncp' ?) A log file of a failing client with 'verb 4' set would help.
HTH,
JJK
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