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Minneapolis, MN

[Connectivity] Connection time outs to certain websites only.

Until today I had Centurylink DSL, and had significant issues with connection dropping and slow speeds. However, when connected and at decent rate I did not have issue I about to describe

I signed up with Comcast and was connected today. With DSL I used a Cisco 877w ADSL router, and behind that was a Cisco ASA5505. I merely changed one ethernet port to a vlan using DHCP. I connect fine. Speeds very good. Except..certain websites just fail on me. And If I open multiple windows, the 2nd or 3rd often fail to load.

So first thing I thought of was look at the local network configuration. Eventually I got so frustrated I hooked my laptop up directly to the cable modem (Cisco DPC3008). To my surprise I see the same problem. The DSL now using the Zyxel modem with Wifi, so I switch from Comcast to Centurylink, and the pages for whatever website load fine (albeit slower).

This only happen to select sites, other sites I can load up in browser (any browser) multiple windows just fine. Weirder still, even Comcast own website I experienced this issue. So....where can I begin to even look at the cause?


Stuarts Draft, VA

Re: [Connectivity] Connection time outs to certain websites only

I'm a little confused... You're using the same router for both the DSL line and Comcast ?

Post your Comcast signal levels.

»Comcast High Speed Internet FAQ »How To Get Help!

Snohomish, WA
After the signals (really all the info in ExoticFish See Profile's link may help)

Can you post examples/URL's of the sites? It is possible you are not alone and either a comcast problem or the route they receive does not work well.

Bueller? Bueller?
El Dorado Hills, CA
reply to Sammy5
It would help if you showed the first 3 octets of your public IP(s) and the hostnames/IPs of the sites that do not work. Could be as simple as a netmask problem, but without details it's impossible to say.
"I drank what?" -Socrates


reply to Sammy5
Did you modify the MTU or MSS on the physical interface that you added the vlan to?


Minneapolis, MN
reply to ExoticFish
Yes, the 877 has 1 ADSL port but also 4 ethernet which I assigned seperate vlans to each port. One port set for DHCP and is connected to the modem. Regardless though, that is misleading as I directly connected laptop to modem and experience same issue.

First octets are 50.148.215.**/23. Sites I have issues with;

Now Youtube videos load nice and fast. But longer I am on site, more problems I experience.

And finally yes, in fact I had "ip tcp adjust-mss 1452" on that vlan which is assigned to port for modem. I did remove that but no change. One thing I did notice. If I for example stay on site and just do anything for some time, when I come back the issues are not present until after a few minutes. I have tried 3 different laptops, 1 w/ XP and others with Win 7. Again I need merely swap cables connect to other switch directly connected to DSL modem and problems go away.

Almost forgot;
Downstream Channels
Channel 1:
Power Level: -7.3 dBmV
Signal to Noise Ratio: 37.6 dB

Upstream Channels
Channel 1: 49.0 dBmV

Snohomish, WA

1 edit
Your downstream is on the low end, probably not the problem since it seems to be site specific.
just going to the cracked front page opens an additional 30 TCP connection with a fair amount of traffic which doesn't seem to stop even while idle hard to say if youe browser or security settings might be set on one connection vs the other.

all 50.148.215.** address I tried have a consistently low 60ms(quite reasonable) from here through and then have 1-3 additional non-responsive hops leading to parts unknown. can't see that latentcy would be a problem.

Target Name: te-3-0-0-ten02.stlouispark.mn.minn.comcast.net
Date/Time: 2/14/2013 2:57:32 PM to 2/14/2013 2:57:45 PM

Hop Sent Err PL% Min Max Avg Host Name / [IP]
2 14 0 0.0 7 21 11 []
3 14 0 0.0 8 12 9 te-0-0-0-4-ur10.everett.wa.seattle.comcast.net []
4 14 0 0.0 8 16 9 ae-29-0-ar03.seattle.wa.seattle.comcast.net []
5 3 0 0.0 14 25 18 he-1-5-0-0-11-cr01.seattle.wa.ibone.comcast.net []
6 14 0 0.0 34 49 39 pos-0-8-0-0-cr01.denver.co.ibone.comcast.net []
7 14 0 0.0 60 66 62 pos-0-14-0-0-ar01.crosstown.mn.minn.comcast.net []
8 14 0 0.0 59 66 61 te-0-2-0-0-sur01.stlouispark.mn.minn.comcast.net []
9 14 0 0.0 58 64 60 te-3-0-0-ten02.stlouispark.mn.minn.comcast.net []