MTU between internet, router and computer
I am programming a router based software under linux.
If an interface behind my router has a lower MTU than in my local network, how could i tell the computers in the local network they have to send with a MTU x.
I tried to capture packets from my D-Link router at home, but I could not find out how he's solving the problem.
I found no packet who is telling the computers the MTU.
However, the computers in my local network never send with MTU greater than x to the internet.
I thought there might be a special kind of ICMP packet.
Is there anybody who can solve the problem?