Packet loss

[#1]

Mtr_Version	Start_Time	Status	Host	Hop	Ip	Loss%	Snt		Last	Avg	Best	Wrst	StDev
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	1	foo.bar	0	100	0	0.27	0.23	0.17	0.4	0
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	2	A.router	0	100	0	0.35	0.33	0.26	0.53	0
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	3		100	100	100	0	0	0	0	0
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	4	133.hiper04.sheff.dial.plus.net.uk	74	100	74	19.34	17.12	12.44	26.62	4.28
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	5	132.hiper04.sheff.dial.plus.net.uk	0	100	0	14.33	17.36	12.1	32.98	5.85
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	6	195.99.125.144	0	100	0	25.5	17.8	12.94	31.87	4.59
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	7	peer8-et-7-0-4.telehouse.ukcore.bt.net	0	100	0	45.26	28.58	13.19	78.24	14.08
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	8		100	100	100	0	0	0	0	0
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	9	po4-31.core-rs2.thdo.ncuk.net	0	100	0	38.12	22.77	13.48	174.69	18.74
MTR.0.87	1552079796	OK	pingbox1.thinkbroadband.com	10	pingbox1.thinkbroadband.com	0	100	0	18.76	18.8	12.75	35.33	5.34

hop 3 is the first device after my edge router, unidentified, is this in the exchange?

hop 4 is PN's?

hop 8, unidentified 

What would be  the high loss percentages  especially hops 3 & 4?

Thanks

[#2]

are you on a static ip address?

if so maybe something to do with the way plusnet routes the data threw there network ?

[#3]

@iangilf 

I am not sure, a power cycle resulted in the same ip address.

I have never requested a static address  as I have no requirement.

I have an ongoing issue with reduction in speed (sync remains constant) between 18:00 and 00:00 most days,

but during that time period wan traffic is low.

Here is another one, at 06:30, wan traffic minimal

Mtr_Version	Start_Time	Status	Host	Hop	Ip	Loss%	Snt		Last	Avg	Best	Wrst	StDev
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	1	foo.bar	0	100	0	0.35	0.24	0.17	0.37	0
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	2	A.router	0	100	0	0.38	0.36	0.24	3.5	0.3
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	3		100	100	100	0	0	0	0	0
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	4	133.hiper04.sheff.dial.plus.net.uk	62	100	62	12.5	12.29	11.8	12.9	0
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	5	132.hiper04.sheff.dial.plus.net.uk	0	100	0	12.26	13.57	11.71	137.13	12.46
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	6	195.99.125.144	0	100	0	13.05	13.3	12.29	36.99	2.38
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	7	peer8-et-7-0-4.telehouse.ukcore.bt.net	0	100	0	13.11	17.52	12.66	204.42	24.1
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	8		100	100	100	0	0	0	0	0
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	9	po4-31.core-rs2.thdo.ncuk.net	0	100	0	163.81	23.18	12.94	393.57	44.21
MTR.0.87	1552112863	OK	pingbox1.thinkbroadband.com	10	pingbox1.thinkbroadband.com	0	100	0	13.03	14.47	12.5	150.82	13.85

[#4 · Accepted solution]

Hi dws1900,

That is not packet loss as all packets reached the destination. Zero % loss on hop 10.

Hop 3 and 8 will be configured not to reply to being pinged.

Hop 4 would appear to respond to some pings.  Presumably the router prioritises routing packets over responding to pings?

Regards

Richard

[#5]

@RichardB 

Thanks for informing me, will have to RTFM the mrt man page

[#6]

@RichardB 

Hi

Just to expand, I was trying to determine where on the network the problem lies with the throughput in the evening, where the speedtest drops from 20Mbs to around 5Mbs, between 18:00 to 19:00, and the latency tends to rise.

[#7]

Hi dws1900,

A one hour speed reduction could be the BT wholesale network from your exchange to the PN handover point reaching its maximum throughput. A so called "hot VLAN". However, this often results in the slow downs occurring from 4/5pm onwards and for more than one hour.

Have you raised a fault with PN?

The typical testing scenario is to ensure only one PC is connected to the router and connected via ethernet.

Then run some BT wholesale speedtests in 24 hours, at least one when the slow down occurs and one in off peak.

PN and BT should be able to access these speedtest as evidence of the issue.

Regards

Richard

[#8]

@RichardB 

Hi

oops, i missed typed, apologies,  it is from 18:00 to 00:00 (typically, not exactly) , and PN have stated its not a hot vlan, and the backhaul is sufficient.

From 00:00 to 18:00 (typically) its 20Mbs approximately download on the speed tests.

The sync speed is around 22Mbs, which is as good as it gets for my lengthy line.

SNR is typically 3-4 db on dl, its a Huewi dslam and a Vigor router. 

I am going to carry out a repeat test where everything is off apart from my linux based monitoring system, which does a speed-test every 15 mins.

Re BT flash based test on the W10 system it shows it as a fault between 18:00 - 00:00 (typical) but ok at other times!!

(Flash not allowed on any other system due to security issues)

Here is one I made earlier.

Date.                             Location       Provider                                 Km.      Latency      UL.            DL

2019-03-08 23:45:02	Leek	Internet Connections Ltd	37.04	21.06 ms	2.62 MB/s	20.26 MB/s
2019-03-08 23:30:01	Leek	Internet Connections Ltd	37.04	22.23 ms	2.59 MB/s	19.26 MB/s
2019-03-08 23:15:01	Leek	Internet Connections Ltd	37.04	24.61 ms	2.68 MB/s	14.98 MB/s
2019-03-08 23:00:01	Leek	Internet Connections Ltd	37.04	21.16 ms	2.41 MB/s	15.67 MB/s
2019-03-08 22:45:01	Leek	Internet Connections Ltd	37.04	22.41 ms	2.34 MB/s	14.11 MB/s
2019-03-08 22:30:02	Leek	Internet Connections Ltd	37.04	29.36 ms	2.61 MB/s	7.20 MB/s
2019-03-08 22:15:01	Sheffield	High Availability Hosting Ltd	39.12	35.22 ms	2.64 MB/s	4.14 MB/s
2019-03-08 22:00:02	Nottingham	CWCS Managed Hosting	24.00	35.83 ms	2.61 MB/s	4.59 MB/s
2019-03-08 21:45:01	Leek	Internet Connections Ltd	37.04	36.45 ms	2.65 MB/s	3.63 MB/s
2019-03-08 21:30:03	Sheffield	High Availability Hosting Ltd	39.12	87.09 ms	2.11 MB/s	3.56 MB/s
2019-03-08 21:15:02	Sheffield	High Availability Hosting Ltd	39.12	29.46 ms	2.76 MB/s	13.33 MB/s
2019-03-08 21:00:02	Sheffield	IDAQ Ltd	39.12	29.48 ms	2.60 MB/s	6.77 MB/s
2019-03-08 20:45:02	Sheffield	IDAQ Ltd	39.12	36.27 ms	2.52 MB/s	3.24 MB/s
2019-03-08 20:30:02	Sheffield	IDAQ Ltd	39.12	31.89 ms	2.35 MB/s	6.88 MB/s
2019-03-08 20:15:01	Leek	Internet Connections Ltd	37.04	25.43 ms	2.67 MB/s	15.25 MB/s
2019-03-08 20:00:01	Nottingham	CWCS Managed Hosting	24.00	32.31 ms	2.71 MB/s	7.35 MB/s
2019-03-08 19:45:01	Leek	Internet Connections Ltd	37.04	22.69 ms	2.49 MB/s	17.51 MB/s
2019-03-08 19:30:02	Leek	Internet Connections Ltd	37.04	22.41 ms	2.43 MB/s	19.11 MB/s
2019-03-08 19:15:02	Leek	Internet Connections Ltd	37.04	21.77 ms	2.62 MB/s	19.72 MB/s

[#9]

Hi

Assumming noting your end is using the bandwidth, the speedtest results seem like those of a circuit on a hot VLAN to me!

My speedtest results are similar in the evening when my kids are streaming videos!

Could be worth pushing PN to ask BT to double check the VLAN utilisation.

[#10]

@RichardB 

Hi

Yes I think I will. There is an unresolved ticket where I tasked myself to try and get some correlated evidence from a neighbour on BT, but nothing concrete , and they are not geeky like me!!

PN wanted me to fault it out, but realistically whats an OR engineer going to do?, say the lines OK, it syncs within the contracted speed not much else can we do about it. I spoke to an OR engineer while out and about, he said they call it peaks and troughs, and it could  be the dslam or PN's equipment.

Annoyingly the dsalm was modified to take an extra 128 lines, despite being 1.5k from me and 200m from the exchange (duh).

The County Council politico's  have been crowing that under BDUK the county has over 90 odd percent 24Mbs (Superfast) service, well not my street!!

[#11]

---

@dws1900 wrote:

PN wanted me to fault it out, but realistically whats an OR engineer going to do?, say the lines OK, it syncs within the contracted speed not much else can we do about it.

---

Hi I agree the Openreach tech is unlikely to find anything but PN like most ISPs have their processes and procedures - flow diagrams to follow!

I would raise a speed fault and hìghlight that it only occurs at peak times.

Then if PN want to send a BT tech ask one of the PN staff on the forum to assist.

Regards

Richard

[#12]

@iangilf 

To answer your question re static address, no I believe it is dynamic as I have had a power outage, followed by a reboot, address has changed.

[#13]

ok m8 just wondered if it had something to do with that thats all and ok m8