Two T61's - connected, yet not resolving - other computers do

Hello All,
We have two identical T61's that suddenly stopped (even though connected to the wireless router both wirelessly and hard wired) resolving to anything on the Internet, including email client activity, etc.   Anoher older R52, which I am sending this on is connected the same way and works fine - any ideas?
H. Amina

Hi hamina, welcome to the Lenovo user forums!
To help you with this one the community will need a bit more information.
For example, tell us what you see when they are "stopped", the OS you are using, machine type, whether you are using Access Connections or a firewall, and any other information you think might be relevant.
I don't work for Lenovo. I'm a crazy volunteer!

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    >
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    This leads me to think there's a problem with how my Mac OS handles the networking. I have checked the Console, but the only related string I found is this:
    16.04.13 22:03:25
    kernel
    SIOCPROTOATTACH_IN6: en2 error=17
    As expected, Google doesn't reveal anything about that (and I'm connected with the first ethernet port). I've tried to restart my Mac, but the problem persists (exact same symptoms).
    Could it be a DNS cache issue?
    I don't see, other than a DNS problem, why I can't connect to the Internet with my Mac OS while I can on my virtual machines. If it was a driver problem, I wouldn't be able to connect to my router. If it's a DNS issue, where are the DNS caches located in order to clear them (I'd trash the folder)?
    I could also reinstall the OS (waste of time, btw), but I'd really like to understand the problem, not just clear it and forget about it.
    Or better than guesses, anyone already experienced this?
    Any help welcome.

    If it's a DNS issue, where are the DNS caches located in order to clear them (I'd trash the folder)
    No DNS caches, it looks up the alphabetic and then uses the numberic from then on.
    http://17.149.160.49
    is Apple, Inc main US web site. It that works, and the alphabetic does not, you have a DNS probelm.

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