[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now


Why do I have to reboot my Comcast router to access some web sites?

Posted on 2012-09-04
Medium Priority
Last Modified: 2012-09-04
I'm seeing some really odd behavior on my office LAN recently.  I have Comcast business class service using an SMC 8014 modem/router. No speed problems, but I lose access to specific web sites and then have to reboot the router to get them back. Two web sites in particular I lost access to in the past few days: www.symantec.com and www.logmein.com. No problem accessing numerous others; just one or two. Reboot the router, and they're back.

I hesitate to call Comcast about this without some background info because I suspect they wouldn't believe me. In fact, I probably would not believe a user if one called and told me the same story. I don't have a clue how a router would prevent access from a few specific sites like that. Enlighten me, someone. Thanks.
Question by:tcianflone
  • 2
  • 2
LVL 22

Expert Comment

by:Larry Struckmeyer MVP
ID: 38364965
What supplies the DNS settings to the users on the LAN?  Is there a Windows or other server, or is this an ad hoc bunch of computers using the router for DHCP and DNS?  If so, try using a different DNS provider, such as Google or Verizon, just to see if that fixes it.  Otherwise, put the Comcast thingy in bridge mode and get a router/firewall with a bigger cache that does not fill up and to to sleep.

Author Comment

ID: 38365156
No domain here; just a couple of peer-to-peer clients connected to the Comcast router/switch. Default gateway, DNS server and DHCP server all handled by the Comcast router. Next time this happens, I will switch DNS provider and see if that works. Can you point me to an article that talks about router caches filling up and such? This is a new concept to me and need to learn more about it. Thanks.
LVL 22

Accepted Solution

Larry Struckmeyer MVP earned 1500 total points
ID: 38365269
You might also ask Comcast for a newer better thingy or a firmware upgrade.  But ISP supplied routers/modems/thingies are famouss for brain farts.  

Search on the following:
isp modem arp chache

enjoy... I got 78.5K hits.

Author Closing Comment

ID: 38366499
Well, this is a total surprise to me. Had no idea that those devices had arp caches in them. Makes sense now. On another thread I read that Comcast offers a DOCSIS3 compliant modem/router now which is much superior to the SMC device I have. Gotta call and see if I can get them to put in one of those.

Featured Post

Upgrade your Question Security!

Add Premium security features to your question to ensure its privacy or anonymity. Learn more about your ability to control Question Security today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Problem Description:   Couple of months ago we upgraded the ADSL line at our branch office from Home to Business line. The purpose of transforming the service to have static public IP’s. We were in need for public IP’s to publish our web resour…
The Cisco RV042 router is a popular small network interfacing device that is often used as an internet gateway. Network administrators need to get at the management interface to make settings, change passwords, etc. This access is generally done usi…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

873 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question