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7 posts

Wannabe Geek


Topic # 239435 17-Jul-2018 16:39
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Having a strange issue here, not sure if there are any networking people hanging about but it has stumped me. I've got a brand new Cat7 cable which is hooked up to our Orcon NF4v adsl line. When taking a speedtest, same server, same cable I am getting different pings on two different machines. This is not the issue, I realise that many factors can come into play, the issue is that my vastly superior desktop machine with a gigabit port is getting consistent pings of 27 while my ancient NEC laptop is getting consistent pings of 16. My desktop was built in the last couple of years, Gigabyte Sniper B7 MB with an Intel Gigabit port. The max speeds of the port on the laptop is 100mb/s. The laptop is running Windows 7 SP1 and the desktop is running Arch with the 414 kernel, I've already tried installing windows on the desktop, but that gives me the same results. I have also tried a different cable, same results, static IP, same results, changing the duplex values, changing DNS servers, disabling NAT on the Ethernet line, reinstalling the most recent drivers while running Windows 10 on my desktop (drivers that were released 10 years after the final update of the laptop's drivers) which surprisingly all producing the same results. Both using the chrome as the browser although I have tried using Firefox which also produces the same results.

 

I'm looking at some trace routes from the router, however I can't seem to understand what they are telling me, perhaps someone can point me in the right direction. Anyone know any other tools I can use to debug the issue and see where these extra 14 or so ms of ping are bizarrely coming from? The download speeds are also slightly different with the laptop again winning out, however I couldn't tell you exactly by how much.

 

Please don't bother commenting if you are just going to say "I wouldn't worry about it, it's not going to make a difference anyway..." I am looking to debug the issue, not to ignore it.


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  Reply # 2057893 17-Jul-2018 16:44
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Try using "ping" on the command line and start working your way through the upstream connection points....

 

 




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Wannabe Geek


  Reply # 2057924 17-Jul-2018 16:47
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wellygary:

 

Try using "ping" on the command line and start working your way through the upstream connection points....

 

 

 

 

I assume you mean in windows? Since Arch gives me this.

 

64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.437 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.609 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.507 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.533 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=0.490 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=0.483 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=0.536 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=0.690 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=0.424 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=0.492 ms
64 bytes from 192.168.1.1: icmp_seq=11 ttl=64 time=0.509 ms
64 bytes from 192.168.1.1: icmp_seq=12 ttl=64 time=0.593 ms
64 bytes from 192.168.1.1: icmp_seq=13 ttl=64 time=0.399 ms
64 bytes from 192.168.1.1: icmp_seq=14 ttl=64 time=0.514 ms
64 bytes from 192.168.1.1: icmp_seq=15 ttl=64 time=0.541 ms
64 bytes from 192.168.1.1: icmp_seq=16 ttl=64 time=0.436 ms
64 bytes from 192.168.1.1: icmp_seq=17 ttl=64 time=0.374 ms
64 bytes from 192.168.1.1: icmp_seq=18 ttl=64 time=0.436 ms


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  Reply # 2057926 17-Jul-2018 16:50
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Older computers are often faster at basic tasks since they don't have the same overhead of complicated hardware and firmware that modern devices do.


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  Reply # 2057931 17-Jul-2018 16:54
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What are the pings to the router from both machines?

 

The cable will make no difference since cat7 offers no advantages over cat5 for Ethernet in your scenario.

 

 

 

 

 

 




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  Reply # 2057932 17-Jul-2018 17:01
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sbiddle:

 

What are the pings to the router from both machines?

 

The cable will make no difference since cat7 offers no advantages over cat5 for Ethernet in your scenario.

 

 

 

 

 

 

 

 

Those are the pings,

 

https://pastebin.com/TAs5UBp7

 

I actually reckon it does give an advantage, Cat7 cables indeed provide better shielding and more consistent speeds when the cable is over a couple of metres. She's a 15m cable I've got running at the moment. It won't have a massive difference I agree but a couple of mb/s, couple of ms, could do. 




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  Reply # 2057933 17-Jul-2018 17:02
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sbiddle:

 

What are the pings to the router from both machines?

 

The cable will make no difference since cat7 offers no advantages over cat5 for Ethernet in your scenario.

 

 

 

 

 

 

 

 

 

 

You reckon that's it? I thought it could be too but really.. with that port it's embarrassing. 


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  Reply # 2058010 17-Jul-2018 20:48
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Dionysus:

 

sbiddle:

 

What are the pings to the router from both machines?

 

The cable will make no difference since cat7 offers no advantages over cat5 for Ethernet in your scenario.

 

 

 

 

 

 

 

 

Those are the pings,

 

https://pastebin.com/TAs5UBp7

 

I actually reckon it does give an advantage, Cat7 cables indeed provide better shielding and more consistent speeds when the cable is over a couple of metres. She's a 15m cable I've got running at the moment. It won't have a massive difference I agree but a couple of mb/s, couple of ms, could do. 

 

 

Pretty hard to tell anything from that and diagnosing such a fault would require a lot more testing.

 

Cat7 cable certainly won't offer any advantage or difference over that distance using FE or Gigabit Ethernet, and unless the laws of physics have changed certainly can't change latency vs a 50c cat5e cable.

 

 




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Wannabe Geek


  Reply # 2058011 17-Jul-2018 20:51
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Fair call although regardless the cable certainly isn't the issue.

Any ideas about something I could do?

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  Reply # 2058044 17-Jul-2018 22:25
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Sounds to me like between tests you actually ended up on another server or alternative route to the server.

 

 

 

Your latency to the router doesn't seem any different so internal is sweet.

 

Try double checking your testing against the same server

 

 





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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.




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  Reply # 2058051 17-Jul-2018 22:52
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hio77:

 

Sounds to me like between tests you actually ended up on another server or alternative route to the server.

 

 

 

Your latency to the router doesn't seem any different so internal is sweet.

 

Try double checking your testing against the same server

 

 

 

 

 

 

Yeah, that could have been the issue, although I have done the test upwards of 30 times with the exact same results, there isn't an issue with speed test directing servers to different oses?


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  Reply # 2058073 18-Jul-2018 02:58
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Have you tried testing using the Windows inbuilt ping command or another application apart from speed test. Do still get different ping for each computer? Does the router have its own inbuilt ping function?

Are you using the same version of the speed test website? As there is the older flash based version, and an HTML5 version.





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  Reply # 2058080 18-Jul-2018 07:25
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Dionysus:

 

hio77:

 

Sounds to me like between tests you actually ended up on another server or alternative route to the server.

 

 

 

Your latency to the router doesn't seem any different so internal is sweet.

 

Try double checking your testing against the same server

 

 

 

 

 

 

Yeah, that could have been the issue, although I have done the test upwards of 30 times with the exact same results, there isn't an issue with speed test directing servers to different oses?

 

 

You never said you were using speedtest.net for your testing. Therein lies your problem.

 

Ping is your friend and the only tool you should be using for testing. Latency using speedtest.net from a browser can of course deliver differing results on different browsers and PCs.

 

 




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Wannabe Geek


  Reply # 2058394 18-Jul-2018 16:22
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Aha, why is that? I don't see how they should give a difference in ping of upwards of 10ms. Such a site should surely have prevention measures in place for such a situation.


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  Reply # 2058398 18-Jul-2018 16:43
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I suggest you read up how speedtest.net works especially when you're using it from a browser that requires HTML5 or flash to work. 10ms is such a small time that different browsers and different PCs can and do deliver different results.

 

If you want to test latency you should be using ping. It's what it was built for.

 

 


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