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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 6 Configuring PPPoE over Ethernet and IEEE 802.1Q VLAN
TCP MSS Adjust
Restrictions for TCP MSS Adjust
• The TCP MSS Adjust feature only works if the MaxSegSize option is the first option included in
the packet. If a non-typical TCP packet is received, where MaxSegSize is not the first option in the
packet, the TCP MSS Adjust feature configuration will have no effect.
Configuration Task for TCP MSS Adjust
Perform this task to configure the maximum segment size (MSS) for transient packets that traverse the
Cisco 10000 Series router, specifically TCP segments in the SYN bit and to configure the MTU size of
IP packets.
SUMMARY STEPS
1. enable
2. configure terminal
3. ip pxf adjust-mss max-segment-size
4. end
DETAILED STEPS
Command or Action Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.
• Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
ip pxf adjust-mss max-segment-size
Example:
Router(config)# ip pxf adjust-mss 1452
Adjusts the MSS value of TCP SYN packets going through
the Cisco 10000 Series router. The max-segment-size
argument is the maximum segment size, in bytes. The range
is from 500 to 1460.
Step 4
end
Example:
Router(config-if)# end
Exits to global configuration mode.