[Cerowrt-devel] [aqm] ping loss "considered harmful"
swmike at swm.pp.se
Sun Mar 1 23:05:18 EST 2015
On Sun, 1 Mar 2015, Dave Taht wrote:
> but wow, it never occurred to me - in all these years - that ping was
> the next core metric on simple tests. I can be really dumb.
> How can we fix this user perception, short of re-prioritizing ping in
People will make all kinds of judgement calls based on things that are not
Some people think a traceroute with few hops in it to be better than one
with more hops in it. So a lot of providers use their MPLS networks and
make the intermediate nodes not show up in traceroute.
I don't know how many times I have experienced people have used PING and
opened trouble tickets when a core router had ICMP ping packet loss (even
though all core router platforms have rate limiters for ICMP).
When you say that you de-prioritize ping, do you mean only ECHO REQUEST
and ECHO REPLY, or do you mean all ICMP? Perhaps a solution would be to
assure 5% of the link bandwidth for ICMP?
Mikael Abrahamsson email: swmike at swm.pp.se
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