Random DNS Problems

[news.microsoft.com]

We host a number of websites and are having random problems with all of
them. We seem to be getting about 90% of the normal traffic.

What is happing is that some people cannot load the websites. Then can't
even ping the website. However, they can ping the ip address and they might
be able to ping the domain but not with www. in front of it. An hour later
it may work with the www. but not just the domain. I have received the
following two results from the ping: "request times out" and "Reply from
12.125.72.37:destination host unreachable". I am sure there are others that
have not been reported.

Often times if the user reboots the problem goes away for a few hours but
then it comes back. We have tested the ip communication several ways and it
always works. It's just when they use a domain name that they have
problems. It's like we are having random dns problems.

Any ideas?

 

[Kevin D. Goodknecht Sr. [MVP]]

In news.microsoft.com <[email protected]>
posted their concerns,
Then Kevin D4Dad added his reply at the bottom.

We host a number of websites and are having random problems with all
of them. We seem to be getting about 90% of the normal traffic.

What is happing is that some people cannot load the websites. Then
can't even ping the website. However, they can ping the ip address
and they might be able to ping the domain but not with www. in front
of it. An hour later it may work with the www. but not just the
domain. I have received the following two results from the ping:
"request times out" and "Reply from
12.125.72.37:destination host unreachable". I am sure there are
others that have not been reported.

Often times if the user reboots the problem goes away for a few hours
but then it comes back. We have tested the ip communication several
ways and it always works. It's just when they use a domain name that
they have problems. It's like we are having random dns problems.

Any ideas?

What DNS servers are you using?
It sounds to me like you might have two DNS servers that don't have
identical records but your question is really unclear and you need to give
us a better idea as to what DNS servers you are using. Is one internal
serving an AD domain maybe?

 

[William Stacey]

The ping reply suggests that the IP address in not reachable which sounds
more like an IP/router issue then a DNS issue. Ping the address by IP (not
by name) to see if you can repro the problem this way.