High latency towards the next hop (or am I going crazy)

  • 24 January 2021
  • 6 reacties
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  • IceLed
  • is een nieuwe Poster
  • 3 reacties

Dear community - first of all, super useful forum, really like the information shared!

Let me start with the problem statement: I think the latency for the type of connection I having (Fiber) is way too high. I have traced it back to the link between my home and the next hop (presumably Point of Presence, literally 1.5 km away from my home). I am seeing about 5 ms to that first hop, and hence everything else has increased latency. What are your experiences on fiber?

A bit more background: I live in Leidsche Rijn and number of years ago ReggeFiber came by installing fiber on my street and respectively I was the first one to sign up. I got the internet subscription back then from XS4ALL, and that was pretty much until KPN took over. Then I switched to T-Mobile Thuis over the same fiber. Lots of issues with the standard modem and media convertor etc, so at some point of time got sick of it and threw everything away, moving completely to UniFi solutions - main router being UDM-Pro. 

So the setup right now is:

Fiber from ReggeFiber directly into UDM-Pro, from there fiber to my switch etc.

Now, as you know ReggeFiber got acquired by KPN at some point of time, so something strange happened… The latency to my next hop from sub 1 ms went up to almost 5 ms…

Called the service desk number of times and heard all kind of responses, like:

  • What is latency?
  • If you can reach ”internet” what is the problem”
  • etc etc - you get the picture

At some point of time I even managed to get a person to actually come into my house and check everything. That as well didn’t go so well, as the guy said: I am only hardware tech, sorry - if any hardware is broken I can fix/replace it. Fiber connection to the PoP is not his responsibility… Needless to say, he insisted to test everything with T-Mobile equipment so I had to resurrect that from the dead, but surprise, surprise - the latency was pretty much the same as with my UDM-Pro. He said - not my problem and went away...

I’ve been with T-Mobile Thuis for number of years already, I’ve no contract obligations etc. 

My plan was always 500/500. And to be honest I’d give half of this for a lower latency!

 

I have a direct comparison with a friend on KPN fiber, and he gets consistently less than 1 ms to the next hop…

 

Here are some examples (Executed on UDM-Pro, where fiber terminates):

# traceroute 1.1.1.1
traceroute to 1.1.1.1 (1.1.1.1), 30 hops max, 46 byte packets
 1  xx-xx-xx-62.ftth.glasoperator.nl (62.xx.xx.xx)  4.426 ms  4.450 ms  4.394 ms
 2  one.one.one.one (1.1.1.1)  8.382 ms  8.002 ms  8.092 ms

traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 46 byte packets
 1  xx-xx-xx-62.ftth.glasoperator.nl (62.xx.xx.xx)  4.521 ms  4.499 ms  4.577 ms
 2  dns.google (8.8.8.8)  8.336 ms  7.578 ms  8.052 ms
 

# traceroute ams-ix.net
traceroute to ams-ix.net (185.55.136.60), 30 hops max, 46 byte packets
 1  xx-xx-xx-62.ftth.glasoperator.nl (62.xx.xx.xx)  4.467 ms  4.471 ms  4.314 ms
 2  lb.ams-ix.net (185.55.136.60)  9.411 ms  9.728 ms  9.522 ms
 

# ping ams-ix.net
PING ams-ix.net (185.55.136.60): 56 data bytes
64 bytes from 185.55.136.60: seq=0 ttl=60 time=11.077 ms
64 bytes from 185.55.136.60: seq=1 ttl=60 time=10.850 ms
64 bytes from 185.55.136.60: seq=2 ttl=60 time=10.938 ms
64 bytes from 185.55.136.60: seq=3 ttl=60 time=10.876 ms

 

So, back to my question: what are your experiences with your latency to the next hop (PoP)? I am having a hard time accepting 5 times increase...

Hidden.nld 3 jaar geleden

@IceLed the next hop you see in a tracé is not the local area pop but a router in the T Mobile datacenter. Somewhere in Amsterdam. A ping of 5ms is a extreamly low ping. But you get used tot a low ping fast 😉

There is no expectation for ping Times.

What do the terms “low ping” and “high ping” mean?

The numbers associated with both “low ping” and “high ping” are within a range. Ping amounts of 100 ms and below are average for most broadband connections. In gaming, any amounts below a ping of 20 ms are considered exceptional and “low ping,” amounts between 50 ms and 100 ms range from very good to average, while a ping of 150 ms or more is less desirable and deemed “high ping.”

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UniFi DreamMachine Pro, US-8-150W, US-8-60W, UniFi U6 Lite, Fiber directly in UDM Pro

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Hi @IceLed ,

Do you also notice it in a decrease of speed? 
With the UDM you can check the optical values. If they are to high it can cause higher latency. 
 

command; ethtool -m eth9 should show it. 

I

Thanks @TechRacing93 

Well, to be honest speed is very relative thing - depends on the time of the day, how busy my network is (Netflix + number of other streaming services at the same time) etc. But generally I have zero issues with speed. 

Here is the output of the command, do you see anything strange?

# ethtool -m eth9
        Identifier                                : 0x03 (SFP)
        Extended identifier                       : 0x04 (GBIC/SFP defined by 2-wire interface ID)
        Connector                                 : 0x07 (LC)
        Transceiver codes                         : 0x00 0x00 0x00 0x40 0x00 0x00 0x00 0x00
        Transceiver type                          : Ethernet: BASE-BX10
        Encoding                                  : 0x01 (8B/10B)
        BR, Nominal                               : 1300MBd
        Rate identifier                           : 0x00 (unspecified)
        Length (SMF,km)                           : 3km
        Length (SMF)                              : 3000m
        Length (50um)                             : 0m
        Length (62.5um)                           : 0m
        Length (Copper)                           : 0m
        Length (OM3)                              : 0m
        Laser wavelength                          : 1310nm
        Vendor name                               : UBNT
        Vendor OUI                                : 00:00:00
        Vendor PN                                 : UF-SM-1G-S
        Vendor rev                                :
        Option values                             : 0x20 0x0a
        Option                                    : RX_LOS implemented
        Option                                    : TX_FAULT implemented
        Option                                    : Power level 3 requirement
        BR margin, max                            : 0%
        BR margin, min                            : 0%
        Vendor SN                                 : FT20070639489
        Date code                                 : 200706
        Optical diagnostics support               : Yes
        Laser bias current                        : 16.650 mA
        Laser output power                        : 0.2539 mW / -5.95 dBm
        Receiver signal average optical power     : 0.2279 mW / -6.42 dBm
        Module temperature                        : 48.75 degrees C / 119.74 degrees F
        Module voltage                            : 3.2364 V
        Alarm/warning flags implemented           : Yes
        Laser bias current high alarm             : Off
        Laser bias current low alarm              : Off
        Laser bias current high warning           : Off
        Laser bias current low warning            : Off
        Laser output power high alarm             : Off
        Laser output power low alarm              : Off
        Laser output power high warning           : Off
        Laser output power low warning            : Off
        Module temperature high alarm             : Off
        Module temperature low alarm              : Off
        Module temperature high warning           : Off
        Module temperature low warning            : Off
        Module voltage high alarm                 : Off
        Module voltage low alarm                  : Off
        Module voltage high warning               : Off
        Module voltage low warning                : Off
        Laser rx power high alarm                 : Off
        Laser rx power low alarm                  : Off
        Laser rx power high warning               : Off
        Laser rx power low warning                : Off
        Laser bias current high alarm threshold   : 100.000 mA
        Laser bias current low alarm threshold    : 0.000 mA
        Laser bias current high warning threshold : 90.000 mA
        Laser bias current low warning threshold  : 0.100 mA
        Laser output power high alarm threshold   : 0.6310 mW / -2.00 dBm
        Laser output power low alarm threshold    : 0.1000 mW / -10.00 dBm
        Laser output power high warning threshold : 0.5012 mW / -3.00 dBm
        Laser output power low warning threshold  : 0.1259 mW / -9.00 dBm
        Module temperature high alarm threshold   : 90.00 degrees C / 194.00 degrees F
        Module temperature low alarm threshold    : -45.00 degrees C / -49.00 degrees F
        Module temperature high warning threshold : 85.00 degrees C / 185.00 degrees F
        Module temperature low warning threshold  : -40.00 degrees C / -40.00 degrees F
        Module voltage high alarm threshold       : 3.8000 V
        Module voltage low alarm threshold        : 2.7000 V
        Module voltage high warning threshold     : 3.7000 V
        Module voltage low warning threshold      : 2.8000 V
        Laser rx power high alarm threshold       : 1.0000 mW / 0.00 dBm
        Laser rx power low alarm threshold        : 0.0040 mW / -23.98 dBm
        Laser rx power high warning threshold     : 0.7943 mW / -1.00 dBm
        Laser rx power low warning threshold      : 0.0050 mW / -23.01 dBm
#




 

UniFi DreamMachine Pro, US-8-150W, US-8-60W, UniFi U6 Lite, Fiber directly in UDM Pro
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Reputatie 6
Badge +3

The optical power values are good; 

Laser output power : 0.2539 mW / -5.95 dBm

Receiver signal average optical power : 0.2279 mW / -6.42 dBm

 

So the Fiber to your house is fine. I cannot compare is to my line since im on DSL :tired_face:. One thing to keep in mind is that the XS4ALL network on WBA is different than the T-Mobile network on WBA. So that could explain it. But someone else on fiber should be able to confirm is they have the same latency. 

 

I

Thanks @TechRacing93 ! Hope you get fiber soon in your neighborhood  :) 

UniFi DreamMachine Pro, US-8-150W, US-8-60W, UniFi U6 Lite, Fiber directly in UDM Pro
Hidden.nld
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Reputatie 7
Badge +4

@IceLed the next hop you see in a tracé is not the local area pop but a router in the T Mobile datacenter. Somewhere in Amsterdam. A ping of 5ms is a extreamly low ping. But you get used tot a low ping fast 😉

There is no expectation for ping Times.

What do the terms “low ping” and “high ping” mean?

The numbers associated with both “low ping” and “high ping” are within a range. Ping amounts of 100 ms and below are average for most broadband connections. In gaming, any amounts below a ping of 20 ms are considered exceptional and “low ping,” amounts between 50 ms and 100 ms range from very good to average, while a ping of 150 ms or more is less desirable and deemed “high ping.”

Heeft geen glazenbol.
I

Ok, got it - thanks @Hidden.nld !

Really helps to know that it is just in my head.

Thanks again - topic closed.

UniFi DreamMachine Pro, US-8-150W, US-8-60W, UniFi U6 Lite, Fiber directly in UDM Pro

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