Juniper JUNOS OS 10.3 - XML MANAGEMENT PROTOCOL GUIDE 6-30-2010, Command Reference Manual

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ip tcp adjust-mss
Syntax [ ip ] tcp adjust-mss mssAdjustment
no [ ip ] tcp adjust-mss
Release Information Command introduced before JunosE Release 7.1.0.
Description 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.
Options ip—Specifies optional keyword for use with older scripts
•
•
mssAdjustment —Adjustment value for the MSS; in the range 160–10240
Mode Interface Configuration, Profile Configuration
957 Copyright © 2010, Juniper Networks, Inc.
Chapter 10: I Commands