Signiant Support

Measuring network MTU when ping is disallowed Print


Problem: 


Ping can be used to determine the MTU (Maximum Transmission Unit).  However in many cases firewall rules block ICMP packets and don't allow ping to work.

Resolution:


The utility dds_npc_test is bundled with each agent. It can be found  under the Signiant installation directory in the subdirectory 'bin'.  Running dds_npc_test on an agent and specifying a remote agent hostname as the argument will output the MTU along with other useful network packet characteristics.