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Most network protocols are TCP based, so be aware ping uses ICMP and traceroute UDP

Posted by jpluimers on 2021/09/08

Interesting thread: [WayBackSwiftOnSecurity sur Twitter : “I had this issue in my prev company network. QoS will drop ICMP and you’ll chase your tail. If you want to find out if a network service works, test the service. If you want to know if TCP works, use TCP.… “

So:

  • tcpping and tcptraceroute for the win!
  • remember that some protocols, rely on ICMP or UDP, so ensure these work on your network tool (do not QoC them away!)

[WayBack] Zimmie on Twitter: “It is perhaps worth noting: traceroute does not generally use ICMP. Instead, it uses this horrific UDP port range with a different port for every probe at every hop. 30 hops? That’s 90 different UDP ports you just tried. Makes its value questionable at the best of times.…”

Related:

–jeroen

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