Intermittent Internet Connection

I am intermittently losing my internet connection.  It is mostly my wireless connection, but I sometimes find my wired connection gone too.  Comcast has done their thing as far as refreshing the modem.  I use Airport Extremes in bridge mode to provide Wi-Fi to my house.  I will run Speedtest on my iPhone or iPad, and I see a network connection issue.  Then I can go to my wired desktop, run Speedtest and it runs fine.  I then immediately run Speedtest on my iPhone and its OK.  Sometimes when I don't get the network connection issue message on my iPhone, I get a Latency test failed message.

Can my wired PC cause me to lose connection wirelessly, or can being active on the desktop start my wireless to work again?  I am looking for places to troubleshoot the issue.  Any suggestions are welcome.  Thanks.
Steve LowryPrincipal ChemistAsked:
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jorge diazSECommented:
my best advise is to take one step at at time to isolate the problem. To answer the question your wired pc should not affect your wireless connectivity. When the issue emerges do this from your wired pc: 1.  run a continuous ping to your default gateway and and a continuous ping to an external host ( i usually ping 4.2.2.2). If ping replies look good  from both the default gateway and the external hos and you are still experiencing issues on the wireless devices then the issue is with the wireless network.

Wireless network issues might be a little bit tricky to troubleshoot if you don't have much experience but keep this in mind: it may be caused by wireless interference. Try changing to the less congested 5GHz band, if you are running on the 5GHZ then change to the 2.4... that's a beginning, let me know what the results are..

this is how a good reply looks like ( or something similar):

Pinging an external IP:

C:\Users\Administrator>ping 4.2.2.2 -t

Pinging 4.2.2.2 with 32 bytes of data:
Reply from 4.2.2.2: bytes=32 time=20ms TTL=56
Reply from 4.2.2.2: bytes=32 time=21ms TTL=56
Reply from 4.2.2.2: bytes=32 time=13ms TTL=56

C:\Users\Administrator>ping 172.16.5.1 -t

Pinging Gateway:

Pinging 172.16.5.1 with 32 bytes of data:
Reply from 172.16.5.1: bytes=32 time=5ms TTL=64
Reply from 172.16.5.1: bytes=32 time=1ms TTL=64
Reply from 172.16.5.1: bytes=32 time=7ms TTL=64
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JohnBusiness Consultant (Owner)Commented:
If your wireless router is connected to your Comcast modem and your wired connection comes off the Comcast modem (you did not say otherwise) then get Comcast to replace the modem.

I have a cable modem (different supplier) and a Cisco VPN router hooked to it. I never drop wired connection.

Can wired cause wireless to fail? I would say no, but wired outages do implicate your modem.
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Fred MarshallPrincipalCommented:
If the signal level on the cable going to the modem is marginal then it can cause strange results even if the modem is good.  Resetting the modem won't fix this.  Sometimes they can tell if the signal levels are low remotely.  I'd ask Comcast to come out and check the cable signal levels at the installation.
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Steve LowryPrincipal ChemistAuthor Commented:
Thanks for the information everyone.  Pinging my default gateway was 1ms, the external IP was 18 to 36 ms.

I forgot to mention that the two Airport Extremes are connected to each other via a Netgear powerline adapter.  In case I have a problem with the AE (3rd gen which is in bridge mode) or the powerline adapter, I have powered off this AE.  I will see if I have any more problems with this configuration.  If I don't see any problems tomorrow, I will reconnect the AE (3rd gen) directly with an Ethernet cable to the primary AE (5th gen). If the problems stay away, I know it is the powerline adapter that has gone bad.

Concerning the signal going to the modem, last week Comcast ran a new outside cable to the house and then connected it to a "new" modem and checked the signal strength.  When I am connected, I get 50-60 mbps, wired.
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Fred MarshallPrincipalCommented:
I'm a bit confused.  You said that the wired connections fail as well.  So how does this plan address the wired connections?
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Steve LowryPrincipal ChemistAuthor Commented:
I have only seen one failure of the wired connection.  Since I removed the Airport Extreme in bridge mode, I have not experienced any problems.  I still have not reconnected this AE with a wired connection to see if I have an issue with the AE or the powerline adapter.
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Steve LowryPrincipal ChemistAuthor Commented:
Thanks to everyone for their help.
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JohnBusiness Consultant (Owner)Commented:
@sxlowry  - You are very welcome and I was happy to help.
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