On Windows 7 at least you can set the MTU with netsh: netsh interface $PROTO set subinterface $TUNDEV mtu=$MTU store=active
Where PROTO is 'ipv4' or 'ipv6' and the others are even more obvious. OpenVPN doesn't appear to do this; it seems to leave the MTU untouched and instead query the TAP driver for what *it* wants to use as an MTU. Isn't that backwards? -- dwmw2
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