NetBeez live demo - Testing MTU
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The document discusses the Maximum Transmission Unit (MTU), which specifies the largest byte size of protocol data units that can be transmitted. It addresses issues arising from MTU mismatches, including how Layer 2 and Layer 3 interfaces handle packets that exceed MTU sizes, and details related to fragmentation. Additionally, it mentions how to test MTU using ping commands with specified payload sizes.
NetBeez live demo - Testing MTU
- 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