[dns-operations] DNS server benchmarking sanity check

[Florian Weimer]

* bert hubert:

> "The payload of the original packet that caused the error". In order to do
> this, the kernel must keep a copy of all recently sent UDP packets around,
> if only to verify the authenticity of the ICMP responses. 

I don't think there is any such verification (it's just about port
numbers), and the manual page just refers to the payload of the ICMP
packet (which may or may not match the original packet).