Setting the Maximum Segment Size for All TCP Sessions

This command allows you to specify the maximum segment size in TCP SYN packets used during session establishment. Decreasing the maximum segment size helps to limit packet fragmentation and to protect against packet loss that can occur when a packet must be fragmented to meet the MTU size but the packet’s DF-bit (don’t fragment) is set.

• The following command configures the TCP maximum segment size to 1400 bytes for all TCP sessions:

  set security flow tcp-mss all-tcp 1400

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