Author: Rocket
Subject: Utility to display route table including Path MTU
Posted: 14 August 2013 at 2:35pm
I would like to suggest a utility to display the routing table, including the PMTU field.
According to RFC1191 (Path MTU Discovery) http://tools.ietf.org/html/rfc1191.html
when a machine receives an ICMP Datagram Too Big message, the machine will determine what the largest acceptable MTU for the destination is and dynamically add a route for that destination to the route table, including the PMTU value that has been determined.
This means that any future traffic to that destination will automatically use an appropriate MTU value.
netstat -rn can be used to confirm that a route has been added to the route table for a particular destination, but I have not found a way to display what PMTU value has been set for the route.
Subject: Utility to display route table including Path MTU
Posted: 14 August 2013 at 2:35pm
I would like to suggest a utility to display the routing table, including the PMTU field.
According to RFC1191 (Path MTU Discovery) http://tools.ietf.org/html/rfc1191.html
when a machine receives an ICMP Datagram Too Big message, the machine will determine what the largest acceptable MTU for the destination is and dynamically add a route for that destination to the route table, including the PMTU value that has been determined.
This means that any future traffic to that destination will automatically use an appropriate MTU value.
netstat -rn can be used to confirm that a route has been added to the route table for a particular destination, but I have not found a way to display what PMTU value has been set for the route.