This article appears in the June 2014 Cisco TS Newsletter. Subscribe now to have Tech Insights, Services Updates, and TAC-inspired Technical Documents delivered to your inbox each month!   "But look, you found the notice didn't you?" "Yes," said Arth...

SummaryThe effect called "PMTUD black hole" is a failure of the TCP Path MTU Discovery due to ICMP messages "Destination Unreachable, Fragmentation needed" (Type 3, Code 4) not reaching the node that sends the TCP segments that are too large for the ...