Re: [asio-users] MTU value available through boost::asio?

[Igor R <boo...@gm...>]

> That doesn't sound right...  If I have 2 sockets connected to 2 different
> servers, one of which goes through a network with a much smaller MTU, wouldn't the value be different for each one?

Doesn't the above mean that these sockets connect via different interfaces?


> On linux, the MTU can be obtained by calling getsockopt( sockfd, IPPROTO_IP,
> IP_MTU, ... ) on a connected socket.  (I have no idea how to do it on
> Windows, and I suspect Mac is probably similar to Linux.)

I admit I don't know how it's made on linux/macos, but on windows the
MTU value is stored in registry under the following key:
HKLM\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\{interface-guid}\
So it's fixed for a particular interface, and its change requires reboot.