The protocol behind ping and vmkping. Traceflow in NSX can follow it, while blocking it leaves HCX transport monitoring with no data.
Also called Internet Control Message Protocol.
In the Ultra Transcenders books
Each book explains ICMP in context, with comparison tables and the common traps.
Terms in this definition
- vmkping
Run from the ESX shell, it sends pings sourced from a named VMkernel adapter (-I) to verify VMkernel connectivity. Combine a large packet size (-s) with don't-fragment (-d) to check MTU across the full path.
- Traceflow
NSX diagnostic that sends a synthetic packet and records the hops it takes at transport-node level. It never reaches the destination, and on an Edge node VLAN Traceflow cannot inject packets.
- NSX
Software that handles networking and security across VCF, covering firewalling, load balancing, NAT, VPCs, overlay segments and Tier-0/1 gateways.