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New Contributor brainsnorkel
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Optus cable: Ok throughput, but high latency and packet loss

Is there anything that can be done about congestion at my node each evening?

 

Each day 4PM-1AM, local latency goes to 300-1700ms average and packet loss jumps to ~10%. This is a pain for gaming, and packet loss slows down everything TCP-based.  I talked to tech support on the 1300 number and they couldn't understand why I was complaining. Is this the same for everyone on Optus Cable?

 

Start: 2018-07-23T17:38:30+1000
HOST: abend.localdomain           Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- cupboardgateway            0.0%   100    0.4   0.4   0.3   0.7   0.1
  2.|-- 10.49.0.1                  7.0%   100  642.1 302.8   8.4 1327. 317.9
  3.|-- ???                       100.0   100    0.0   0.0   0.0   0.0   0.0
  4.|-- ???                       100.0   100    0.0   0.0   0.0   0.0   0.0
  5.|-- 210.49.112.122             4.0%   100  632.6 297.5  10.6 1315. 296.5
  6.|-- 172.28.126.12              4.0%   100  638.7 290.1  10.7 1253. 289.2
  7.|-- mas5-vl451.gw.optusnet.co 10.0%   100  636.6 296.3  11.3 1196. 303.7
  8.|-- www.optusnet.com.au        7.0%   100  642.9 293.0  12.1 1144. 293.4

 

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New Contributor brainsnorkel
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Re: Optus cable: Ok throughput, but high latency and packet loss

Just to add to the available data, it looks like Optus are shaping traffic at 10.49.0.1 (I'm guessing this is the local HFC aggregation gateway). RTT in the below graph is time for the (mtr traceroute) round trip from www.optusnet.com.au. The spike after midnight each day is my Backblaze scheduled backups starting.

 

Every weekday from (exactly!) 4-10pm ~500ms of delay and some packet loss is introduced. This is probably congestion avoidance by Optus, but it's making working in interactive web sites and online games pretty unusable.

 

I understand Optus want to keep customers happy who just want to know that their download speed is ok, but this is making Internet unusable for my work and my family's entertainment.

 

It looks like weekend throttling starts at 10am, but I haven't monitored long enough to know whether the network going bad all at once exactly on the hour, then returning to health exactly at 10pm is a coincidence, or for how long this coincidence continues to affect network traffic.

 

Note: Long bulk TCP transfers (Netflix and Speedtest.net) seem to be on a prioritization policy that avoids buffering and packet loss, so these are relateively unscathed and everyone gets to see their movies and nice speedtest results.

 

Optus - is this a temporary thing? Is something broken? Or should I be looking for a new ISP?

 

Stats Graph

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RetiredModerator AlexRH
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Re: Optus cable: Ok throughput, but high latency and packet loss

Hey @brainsnorkel, without looking at your account I'd be unable to confirm anything with 100% certainty but peak time slowness is generally experienced through slows of an evening/across the weekend.

That said, I'd recommend getting in touch with our Faults team so we can both look into it further and have a chat about what your options would be moving forward.


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New Contributor brainsnorkel
New Contributor

Re: Optus cable: Ok throughput, but high latency and packet loss

Hi @AlexRH, I have a service number so I think that means I might be engaging the faults team now.

 

The poor network quality is too regular to be congestion. It has to be engineered congestion avoidance like network shaping and/or policing of low priority flows.

 

Organic congestion doesn't occur; exactly 4-10pm weekdays, exactly 10-3pm Saturday, exactly 4pm Saturday to 2:30am Sunday...

 

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Occasional Contributor Deejus
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Re: Optus cable: Ok throughput, but high latency and packet loss

Hi,

 I also am experiencing extremely high latency every night for the last 2 week - I'm still on Optus HFC but appararently Optus is working on migrating to the NBN in the area.

 

 I'm worried that I will experience the same level of performance when I migrate to the NBN which will be in the next month or so - perhaps I should go with another provider?

 

Target Name: www.optusnet.com.au
IP: 211.29.132.105
Date/Time: 01-Oct-18 9:39:26 PM - 01-Oct-18 9:49:26 PM

Hop Sent PL% Min Max Avg Host Name / [IP]
1 241 0 0.22 3.23 0.48 192.168.0.1 [192.168.0.1]
2 241 0 8.90 1198.57 551.91 10.106.0.1 [10.106.0.1]
3 240 100 0 0 0 [-]
4 240 100 0 0 0 [-]
5 240 100 0 0 0 [-]
6 240 100 0 0 0 [-]
7 241 0 10.32 1162.94 559.37 210.49.112.126 [210.49.112.126]
8 241 0 9.52 1153.22 558.82 172.28.126.12 [172.28.126.12]
9 241 0 9.48 1195.09 561.47 172.28.126.34 [172.28.126.34]
10 241 1 10.18 1178.22 562.20 mas4-vl300.gw.optusnet.com.au [211.29.132.2]
11 241 0 9.44 1182.03 551.51 www.optusnet.com.au [211.29.132.105]

 

 Rgds

David

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Moderator GuyCS
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Re: Optus cable: Ok throughput, but high latency and packet loss

Hey @Deejus - I've responded to your other thread here.


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