How to measure use of forwarders?
Carsten Strotmann
carsten at strotmann.de
Fri Nov 19 05:58:00 UTC 2021
Hello Richard,
"Parkin, Richard (R.)" <rparki21 at ford.com> writes:
> Hello!
>
>
>
> We recently re-addressed some of our external-facing cache
> servers into a new network and discovered that our IPs
> appear to be blackholed going to certain third-party auth
> servers, either intentionally or unintentionally. Our
> workaround while we sort through these issues is implementing
> forwarders.
>
>
>
> I’d like to understand how much traffic is flowing to each
> forwarder (QPS, etc) and monitor that for any issues. Is
> there a way to do that effectively in Bind without putting some
> kind of network device on the outbound path to
> measure it? If not, does anyone have any suggestions?
>
I've done a webinar this week for ISC on the topic of
"Instrumenting BIND 9
on Linux with BCC/eBPF". In this webinar, I've used logging of
forwarding
decisions as one example to instrument BIND 9 with eBPF. The
bpftrace
script I've presented might work as a starting point to create
custom
BIND 9 logging for forwarding operations, which does not slow down
the operation of
the BIND 9 server itself.
A recording of the webinar is available at
<https://www.youtube.com/watch?v=VYpZg89NJeA>
Greetings
Carsten
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