jw13's profile

Frequent Visitor

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5 Messages

Mon, Dec 21, 2020 10:00 PM

congestion and packet loss

I live in Wellesley, MA and local service to 'nearby' servers has been great.  However for at least the last week (today 21Dec2020) service to some locations has been poor, others  good..   Is there some place to report my observations?  It is possible there may be a misconfiguration with bgp to the outside or it may be just congestion and selective dropping of packets.

 

 

Responses

EG

Expert

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87K Messages

6 m ago

Have you done any comparative traceroutes to the good and the bad sites ?

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EG

Expert

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87K Messages

6 m ago

Post a trace to https://google.com when things are both good and bad. Use the computer's operating system built-in trace utility.

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Frequent Visitor

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5 Messages

6 m ago

Thanks.

I should have known better, but after doing a long series of pings and trace route samples to my ‘good’ and ‘bad’ destinations it appeared I was seeing 0-30%  packet loss pretty much independent of destination.   At the moment things appear better.

 

I find with samples over the last couple hours that there is 0.2-0.6% packet loss to my LAN router’s WAN address and 3.2-5.0% packet loss to my downlink head end router, with 500 pings.

 

Typical to head-end router:

--- 73.x.x.x ping statistics ---

500 packets transmitted, 477 packets received, 4.6% packet loss

round-trip min/avg/max/stddev = 6.680/9.544/17.827/1.566 ms

 

Typical to LAN router external:

--- 73.x.x.x ping statistics ---

500 packets transmitted, 498 packets received, 0.4% packet loss

round-trip min/avg/max/stddev = 0.316/1.114/1.891/0.408 ms

 

Note: My LAN router local address is 192.168.1.1 and I get its WAN address from my router config tool, Mac AirPort Utility in my case.  The head-end router address is my router’s router address, also seen in the config tool.

 

I’ll know if downlink congestion is really the cultprit when I sample the head-end router with pings when while experiencing a particularly ‘bad’ destination again.  This should have been my first measurement!

 

Frequent Visitor

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5 Messages

6 m ago

? a typo ?  The "www://google.com" is not a valid URL and I do not know what your mean.

EG

Expert

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87K Messages

6 m ago

Try the link now. It was broken, sorry. Do the traces when you perceive that times are good, and then again when you perceive that they are bad so that they may be compared...

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
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Was your question answered? Mark the post as Best Answer!tick

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