Configuring The Mss Value And Mtu For Transient Tcp Syn Packets - Cisco ASR 1000 Series Configuration Manual

Configuring the MSS Value and MTU for Transient TCP SYN Packets

Configuring the MSS Value and MTU for Transient TCP SYN Packets
Perform this task to configure the maximum size segment (MSS) for transient packets that traverse a device,
specifically TCP segments with the SYN bit set, and to configure the MTU size of IP packets.
If you are configuring the ip mtu command on the same interface as the ip tcp adjust-mss command, we
recommend that you use the following commands and values:
• ip tcp adjust-mss 1452
• ip mtu 1492
SUMMARY STEPS
1. enable
2. configure terminal
3. interface type number
4. ip tcp adjust-mss max-segment-size
5. ip mtu bytes
6. end
DETAILED STEPS
Command or Action
Step 1 enable
Example:
Device> enable
Step 2
configure terminal
Example:
Device# configure terminal
Step 3 interface type number
Example:
Device(config)# interface GigabitEthernet
1/0/0
Step 4 ip tcp adjust-mss max-segment-size
Example:
Device(config-if)# ip tcp adjust-mss 1452
IP Application Services Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)
32
Purpose
Enables privileged EXEC mode.
• Enter your password if prompted.
Enters global configuration mode.
Configures an interface type and enters interface configuration
mode.
Adjusts the MSS value of TCP SYN packets going through
a device.
• The max-segment-size argument is the maximum
segment size, in bytes. The range is from 500 to 1460.
Configuring TCP