MTU vs MSS

CyberBruhArmy
InfoSec Write-ups
Published in
2 min readJul 1, 2024
https://youtu.be/p9rZ9A_87Jo?si=eXnJLllf9T0mAEgA

What is MTU?

(Maximum Transmission Unit): MTU represents the maximum size of an IP packet on a given link. It’s used for fragmentation: packets larger than the MTU are broken down into smaller fragments. The MTU value can vary depending on the network technology (e.g., Ethernet, Wi-Fi). Larger MTU values can improve efficiency by reducing overhead due to headers.

What is MSS?

MSS (Maximum Segment Size): MSS is specific to TCP (Transmission Control Protocol) at layer 4. It defines the maximum payload size after accounting for IP, TCP, and other headers. If the MTU is 1500 bytes and IP/TCP headers are 20 bytes each, the MSS is 1460 bytes. During the TCP handshake (usually in the SYN segment), the MSS value is negotiated and remains fixed for the connection. Remember, MTU deals with the entire IP packet, while MSS focuses on the payload within the TCP segment.

Differences Between MTU and MSS

Why MTU and MSS are Important

How to Check and Configure MTU and MSS

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