What is path MTU discovery?

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Path MTU discovery is a simple protocol that aims to automatically find the optimal MTU (Maximum Transmission Unit ) for a TCP connections path. This helps to achieve optimum performance and network utilization.

Red Hat Enterprise Linux has path MTU discovery enabled by default. This may be verified by issuing the following command:

# cat /proc/sys/net/ipv4/ip_no_pmtu_dis...

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