Learn what Maximum Transmission Unit (MTU) parameter is and why it's important. The slide will also offer methods to the MTU in an IP network.

1. Testing MTU
Live Demo

2. Maximum Transmission Unit
Defines the byte size of the largest protocol data unit that is allowed to pass.

3. MTU mismatch
What happens when the packet size is larger than the interface’s MTU?
● Layer 2 vs. Layer 3 interfaces
● Don’t Fragment (DF) bit
○ ICMP Fragmentation Required message (Type 3, Code 4)

4. Pass, Discard, Notify, and Fragment

5. Testing MTU
ping -D -s 1472 <destination_host>
Default 56 bytes payload + 8 ICMP header + 20 IP header
NetBeez