nanog mailing list archives
Re: Anyone seeing ping corruption?
From: Lukas Tribus <lukas () ltri eu>
Date: Tue, 21 Dec 2021 09:34:55 +0100
On Tue, 21 Dec 2021 at 08:11, Hank Nussbacher <hank () interall co il> wrote:
Out of curiosity - does anyone know why Google is truncating ICMP responses ?As Google has stated in many forums and I quote: "Google Public DNS is a Domain Name System service, not an ICMP network testing service."
The core issue is that many watchdogs implemented in all kinds of devices use ICMP for health checking (and just one host), as opposed to DNS or HTTP services of multiple hosts. Those users have to point their watchdogs somewhere, and "ping.crappy-iot-vendor.com" just sounds less reliable (and probably is), then one of those quad8. quad1 or quad9 services. It's obvious that it's not a DNS Servers job to respond to ICMP requests, and under DoS they'd probably rate-limit it. I think Google choice makes sense, at least it does not allow 1:1 reflection at big sizes. Nobody is interested in running reliable anycast ICMP responders on the internet, after all, no useful data can be collected with it. Device vendors will keep shipping code with watchdogs that can only ping a single host, so users will keep putting DNS servers in there. Lukas
Current thread:
- Re: Anyone seeing ping corruption?, (continued)
- Re: Anyone seeing ping corruption? Steven Champeon (Dec 20)
- Re: Anyone seeing ping corruption? Sean Donelan (Dec 20)
- Re: Anyone seeing ping corruption? Valdis Klētnieks (Dec 20)
- Re: Anyone seeing ping corruption? Masataka Ohta (Dec 21)
- Re: Anyone seeing ping corruption? Bjørn Mork (Dec 21)
- Re: Anyone seeing ping corruption? Masataka Ohta (Dec 21)
- Re: Anyone seeing ping corruption? Jon Lewis (Dec 20)
- Re: Anyone seeing ping corruption? Hank Nussbacher (Dec 20)
- Re: Anyone seeing ping corruption? Mark Tinka (Dec 21)
- Re: Anyone seeing ping corruption? Sean Donelan (Dec 21)
- Re: Anyone seeing ping corruption? Lukas Tribus (Dec 21)