Connectivity and managing Your Comcast Business network
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Packet loss and high latency



I am suffering from dropped internet game connections and lag spikes and in order to diagnose, I have used my always on ARM computer to take measurements of the connection quality and graph them with Smokeping.


I see latency up to 3s for pings and significant amounts of packet loss.  Both local devices are plugged into ports on the netgear router itself, there is no packet loss to the Drobo (first pic), 10% max packet loss to the router, 13% max packet loss to the remote gateway.


These figures from the cable stats page on the router look fine to me, but it looks as though most of the packet loss can be correlated to problems with the CG3000DCR.


Is "Residential Gateway" mode correct?


Initialization Procedure

Vendor NameNetgear
Hardware Version1.04
Serial Number2BR23CWJ06982
Firmware VersionV3.01.04
Operating ModeResidential Gateway
System Uptime5 days 13h:45m:46s
Date12 - 22 - 2014


Downstream Channel

Downstream Frequency597000000 Hz561000000 Hz567000000 Hz573000000 Hz579000000 Hz585000000 Hz591000000 Hz603000000 Hz
Lock StatusLockedLockedLockedLockedLockedLockedLockedLocked
Modulation256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM
Symbol Rate5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec
Downstream Power6.5 dBmV6.8 dBmV6.5 dBmV6.2 dBmV5.7 dBmV5.6 dBmV6.5 dBmV6.2 dBmV
SNR41.4 dBmV41.9 dBmV41.8 dBmV41.4 dBmV41.4 dBmV41.4 dBmV41.6 dBmV41.3 dBmV

Upstream Channel

Upstream Frequency21400000 Hz27800000 Hz34400000 Hz39200000 Hz
Lock StatusLockedLockedLockedLocked
Symbol Rate5120 sym/sec5120 sym/sec5120 sym/sec2560 sym/sec
Upstream Power41.5 dBmV42.2 dBmV42.7 dBmV43.0 dBmV


Router is Netgear CG3000DCR


3 connections at rear:  1) Airport Extreme wifi 2) ARM computer 3) Drobo


I have the Udoo set up to ping the Drobo, the Gateway IP, the Remote Gateway IP and several other hops using Smokeping.



Router at home:


Remote gateway:


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Re: Packet loss and high latency

Here's a speedtest I ran that shows how much of a problem this is:


Each trough is a failed multiplayer game or 4k netflix stream.

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Re: Packet loss and high latency


Well, I wish I had done this months ago.  I bought a Motorola SB6121.  That Netgear is a terrible piece of kit.  I'm going to be taking it back to Comcast and telling them to please not inflict it on anyone else.  My network -- even my HOME network is like night and day since changing the router.  I can actually reliably use it.

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Trusted Forum Contributor

Re: Packet loss and high latency

so, interesting to hear you are having very similar problems as had been pointed out in this large thread:


Like many there, replacing the gateway fixed the issue immediately. I will say I saw almost the same kind of thing you did.


Good to know. I will continue avoiding the Netgear.

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