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OCI: How To Change Network MSS Value in Oracle Linux

in Linux

Applies to

Oracle Cloud Infrastructure

Oracle Linux x86-64

Goal

How to change network MSS value in Oracle Linux

Solution

The MSS value (Maximum Segment Size) is a value that is advertised by a Linux system to indicate the preferred size of the TCP segments that it can receive.

In most Linux distributions including Oracle Linux, this is automatically set to the Maximum Transmission Unit (MTU) minus (MTU-40).

TCP/IP packets have a 40 byte TCP header in addition to the actual payload, so for a given MTU value, MSS is by default of value MTU-40.

Note that this is the value that the server advertises and not what can actually be transmitted.

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