Sure Guernsey – Some unusual latency & packet loss

I’ve been getting some unusual readings on my latency monitoring graphs these past 2 days.

I was getting this on Tuesday:

BQM-1

And then I was getting this today:

BQM-2

It’s a mixture of increased latency and, in some cases, moderate packet loss!

I’ve restarted the router and it doesn’t seem to have helped. Looking at the DSL stats, there have been only a small number of FEC events (which is expected – the error correction is simply doing what it’s meant to), and no other stats to indicate line instability (SNR margin sitting at a comfortable 16dB).

So this leads me to a few potential conclusions: There is some upstream issue with Sure’s network; perhaps some sort of DDoS attack against my ip address(?); or perhaps a fault with my router?

I don’t think it’s traffic at my end, since that would involve saturating the connection for long periods of time (I mean, 4 hours at 50Mbps continuously is a 90GB download!). Also the shape of the graph, particularly the top one, makes me quite suspicious (it’s a curve, rather than a distinct block).

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