Ip Tcp Adjust-Mss - Juniper JUNOSE 11.1.X - COMMAND REFERENCE A TO M 4-9-2010 Command Reference Manual

ip tcp adjust-mss

[ ip ] tcp adjust-mss mssAdjustment
Syntax
no [ ip ] tcp adjust-mss
Command introduced before JUNOSe Release 7.1.0.
Release Information
Modifies the maximum segment size (MSS) for TCP SYN packets traveling through
Description
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
Interface Configuration, Profile Configuration
Mode
ip Specifies optional keyword for use with older scripts
mssAdjustment Adjustment value for the MSS; in the range 160–10240
Chapter 10: I Commands
963
ip tcp adjust-mss