Instruction manual

Chapter 2 Installation, Configuration and Management
2-78 NetScaler 9000 Series Installation and Configuration Guide - Volume 1
NSICG60_DEC04
If you need to update a log file name, edit the appropriate file name in the left
most column. The remaining columns control the log rotation parameters. If
you need to customize the log rotation parameters, please refer to the
FreeBSD manpage on newsyslog(8) as this is the same format NetScaler
system logging uses for its log rotation management.
2.7 Path MTU Discovery
Path MTU Discovery is a method for dynamically learning the maximum
transmission unit (MTU) of any Internet path. This discovered Path MTU is
then be used by the TCP or UDP layer to create packets of that size. This will
avoid the fragmentation overhead on the routers in the path and reassembly
overhead on the receiver.
PMTU Discovery is an operation mode in the NetScaler system. This mode
enables the Netscaler system to inter-operate with other routers participating
in PMTU Discovery. In a typical topology, the NetScaler system is deployed
in front of the servers and either manages connection to the clients on behalf
of the servers (transparent mode) or manages connections with the servers and
clients independently (edge mode).
By default, the NetScaler system does not participate in Path MTU Discovery.
This can be enabled by configuring the NetScaler system to operate in the
PMTU Discovery mode. For more information on enabling the PMTUD
mode using the NetScaler CLI, refer to the section Configuring PMTU
Discovery in this chapter.
2.7.1 Behavior of the NetScaler System in Edge Mode
In edge mode, the NetScaler system manages connection to the server and the
client separately. The following table lists the cases and the expected behavior
of the NetScaler system on receipt of a PMTU related ICMP error message: