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FAQ-What Is the Function of Adjusting the TCP-MSS Value?

Publication Date:  2019-01-18 Views:  241 Downloads:  0

Issue Description

What is the function of adjusting the TCP-MSS value?

Handling Process

You can set a proper TCP-MSS value to prevent TCP packets from being fragmented on a USG9000. If the length of a TCP packet exceeds the MTU value set on the USG9000, the packet is fragmented.
You are advised to set the TCP-MSS value to 1460 on a network that has a single VPN (IPSec, L2TP, or GRE) tunnel. If there are multiple VPN tunnels on the network, set the TCP-MSS value based on the network conditions.
The command is as follows:
[USG9000] firewall tcp-mss 1460

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