What MTU should be put in case of a VPN ?

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What MTU should be put in case of a VPN ?

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What MTU should be put in case of a VPN ?
What MTU should be put in case of a VPN ?
2016-08-23 21:37:00
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In that TP-Link article its mentioned that http://www.tp-link.us/FAQ-190.html "Due to additional complications, VPNs require a different type of MTU test" I have adsl2+ model router. The MTU size for my network is 1432+28 = 1460.

Now I connected to one of the VPN servers and then ran a command (ping www.google.com -f -l 1472) to check the MTU. The MTU size came out to be different while connected to the VPN 1472 + 28 = 1500 as opposed to 1432+28 = 1460 when I am not connected to the VPN.

So what MTU should I put in my modem router settings 1500 or 1460 or some other value.
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