[AusNOG] High latency between TPG and Vocus - Victoria

Roy Adams roy at racs.com.au
Tue Aug 25 16:58:55 EST 2020

Hi Giles,

Using ICMP tracesw to measure traffic loss is fraught with danger due to
intermediate routers dropping unimportant traffic like ICMP.
Drawing conclusions regarding packet loss also requires noting the same or
higher degree of packet loss further down the trace, among many other
factors (see further below)
A double end trace (one initiated form each end) is required from to, and also from to
This could well show that the trace in each direction follows a different
path - i.e. asymmetric routing.
mtr / WinMTR is a more reliable tool to do the above - you will need mtr
profiles from each end to start painting a better picture.

Some light reading on understanding traceroutes in general, well worth the

I hope the above is of use.
Here in the Philippines, we have learned some hard lessons about making
assumptions about traffic loss.


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<roy at racs.com.au>
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On Tue, 25 Aug 2020 at 16:42, Giles Pollock <glp71s at gmail.com> wrote:

> Not sure if anyone else is enjoying this experience, but I've seen a few
> occasions where there seems to be degradation between TPG and Vocus in
> Victoria. Pings go up by between 50-100ms with about 15% packet loss along
> the way.
>   4     5 ms     6 ms     5 ms
>   5     6 ms     6 ms     6 ms  27-32-160-196.static.tpgi.com.au
> []
>   6     6 ms     6 ms     6 ms  203-219-107-206.static.tpgi.com.au
> []
>   7    69 ms    67 ms    69 ms
>   8     *        *        *     Request timed out.
>   9     *        *        *     Request timed out.
>  10    68 ms    68 ms    68 ms
>  11    73 ms    72 ms    72 ms
> Seen it come and go a few times over the last few weeks too. Makes working
> from home a bit of a pain when remote sessions keep getting punted out due
> to the packet loss!
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