Packet loss pattern - VDSL

Hi All,

Seeing a packet-loss pattern pinging across a private WAN for one connection in particular. The packet loss is say every 20 packets when any load at all (eg a speedtest from a directly connected laptop) is applied to the link.

​

Type escape sequence to abort.

Sending 1000, 100-byte ICMP Echos to 172.16.6.18, timeout is 2 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!.!!

!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!

!!!!.!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!

!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!

!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!.!!!!!!!!

!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!

!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!

!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!

!!!!!.!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!

!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!

!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!.!!

!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!

!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!

!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!

!!!!!!!!!!!!!!!!!.!!

Success rate is 96 percent (961/1000), round-trip min/avg/max = 15/20/99 ms

To me it seems like a policer/shaper that the link is hitting. Not configured on our CPE or our LNS (same profile and config at 400+ other sites) - potentially applied by carrier.

I dont want to pre-empt any suggestions by giving too much info but some basics summarised below.
> Cisco CPE (same symptom across multiple models 887, 927)
> Cisco LNS (ASR1K)
> Australian NBN - FTTN/VDSL
> Attainable Rate: 142968 kbits/s 55949 kbits/s
> Subscription: 60/20Mbps

Anyone seen such a uniform packet loss pattern on a connection like this before?

Thanks