Ip Tcp Adjust-Mss - Juniper JUNOSE SOFTWARE 11.2.X - XML MANAGEMENT PROTOCOL GUIDE 6-30-2010 Command Reference Manual

ip tcp adjust-mss

Syntax
Release Information
Description
Options
Mode
Copyright © 2010, Juniper Networks, Inc.
[ ip ] tcp adjust-mss mssAdjustment
no [ ip ] tcp adjust-mss
Command introduced before JunosE Release 7.1.0.
Modifies the maximum segment size (MSS) for TCP SYN packets traveling through the
interface. The router compares the MSS value of incoming or outgoing packets against
the MSS adjustment value. For any packet that contains an MSS value larger than the
MSS adjustment value, the router replaces the MSS option with the configured adjustment
value. If the packet does not contain an MSS value, the router assumes a value of 536
for the packet MSS on which to base the comparison. The no version removes the MSS
modification.
NOTE: The purpose behind using MSS is to alleviate problems with Path MTU Discovery
(PMTUD) and resulting " black hole" detection issues. See RFC 2923—TCP Problems
with Path MTU Discovery (September 2000) for additional information about the black
hole scenario.
ip—Specifies optional keyword for use with older scripts
mssAdjustment—Adjustment value for the MSS; in the range 160–10240
Interface Configuration, Profile Configuration
Chapter 10: I Commands
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