Thursday, January 7, 2021

Tool to send large UDP packets and check PMTUD

Hi,

What tool do you use for PMTU discovery testing? It's easy for me to test with TCP but not sure what would be the best for UDP? Seems iperf does TCP MSS lookup and only sends small packets, I can't seem to get iperf to cause ICMP fragmentation needed packets at least, even by playing with the length parameter.



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