Strange TCPIP problem -- cannot reach DNS server

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I have Comcast Internet service. Lately, the connection has been
intermittent. Some times it works and sometimes it does not. Comcast help
has been, well, little help. Currently, they think that if I get rid of my
Linksys modem and switch to a Comcast modem (for $175 vs $60 for my Linksys
modem), the problem will be solved. I do not think this is the problem

The NIC connected to Comcast is set to automatically retreive the IP address
of the connection and a DNS server address. If I release the current
settings with,

ipconfig /release

and then renew them,

ipconfig /renew

the previous (and valid) Comcast IP address is retrieved and the correct DNS
addresses for that IP address is retireved.

The problem is that I cannot connect to the Internet with Internet Explorer
("server not found") or download email ("cannot access server":).

I can ping known IP addresses and get 4 quick replies. If I ping a URL
(e.g., www.yahoo.com), the ping times out. When I ping the Comcast DNS
addresses for my IP addresses 68.87.73.242 and 68.87.71.226), the command
hangs. It does not even time out.

Apparently, the reason I am unable to connect to the Internet is that DNS in
my NIC is not working. Does anyone know what the specific problem is so that
I can fix it?

John Wirt


.

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