Create a Network Policy and a Routing
Policy.
Path MTU Discovery allows the router to monitor the value set
in the MSS option in TCP SYN and SYN-ACK messages, which enables it to reduce the
MSS value below the TCP-MSS thresholds.
-
Select Enable Path MTU
Discovery to enable the Extreme Networks router to learn the
maximum packet size, or maximum transmission unit (MTU), that can be sent
between two hosts without fragmentation.
-
Select Monitor the MSS Option in TCP SYN and SYN-ACK Messages and
Perform Clamping if the MSS Threshold is Exceeded to monitor the
MSS option in TCP SYN and SYN-ACK messages and, if necessary, reduce the MSS
value as determined by one of the following TCP-MSS thresholds.
- MSS Threshold for All TCP Connections: Set the
TCP-MSS threshold for all TCP connections passing through the device. If
you do not enter a threshold value, TCP-MSS clamping uses Path MTU (40
bytes) for the IP and TCP headers.
- MSS Threshold for TCP Connections Through the VPN
Tunnel: Set the TCP-MSS threshold for TCP connections
that pass through a Layer 3 VPN tunnel. If you do not enter a threshold
value, the device uses the value set for the MSS threshold for all TCP
connections.
Continue configuring the network policy.