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*Do you know what MSS (Maximum Segment Size) is?

Suggested page: MSS (Maximum Segment Size): What It Is and How It Works

MSS (Maximum Segment Size) is the maximum amount of application data, or TCP payload, that a device can receive in a single TCP segment. It does not include the IP or TCP headers.

MSS is exchanged when a TCP connection is established. Each endpoint can advertise its preferred MSS in the SYN or SYN-ACK packet, helping the other side determine an appropriate segment size.

A few important points about MSS:

• MSS and MTU are different. MTU defines the maximum size of the entire IP packet, while MSS refers only to TCP data.
• With a standard Ethernet MTU of 1500 bytes, a typical IPv4 MSS is 1460 bytes.
• An MSS that is too large can cause packet loss, retransmissions, slow transfers, or connection failures.
• VPNs and tunnels can reduce the available packet size because they add extra headers.
• MSS clamping can reduce the advertised MSS so TCP segments fit properly through these networks.

MSS can also affect DNS when DNS communication uses TCP.

If you want to explore this topic further, check the following article explaining MSS (Maximum Segment Size) in more detail.