Default DNS grayed out in Network Preferences

In my Network Preferences, my router address/gateeway is listed twice as a default DNS. Maybe once from Tiger and once more from Leopard?
This is probably a Verizon thing
The problem is that they are grayed out and cannot be removed by normal means AFAIK.
My console reports that the same DNS is repeated - a minor but annoying item.
It there any reason for me not to simply comment out one of these pesky DNS in the
/etc/resolv.conf
file?
I have already added two more OpenDNS in the Network Preferences with no problem, and they properly show up in the resolv.conf file as 1 and 2, with the default DNS being 3 and 4.
Why are these default DNS grayed out in Network Preferences?
How did they get there in the first place?
Is there a proper place to remove them or at least un-gray them?
Will commenting out or removing one of the dupes in the resolv.conf file hose anything?

xnav wrote:
Have you got something like 'local DNS caching' turned on in the Verizon? Commenting out of .conf may not stick, I think DHCP will just rebuild it.
I think it's the Verizon router offering the router IP as a fake DNS, which then passes onto the real Verizon DNS down the pipe. Verizon has one of those DNS that trap 404's and offer assistance.
I think that Leopard looks for 2 DNS minimum and therefore takes the Verizon router number 2 times. It's the first time I have seen a router use its own IP as a DNS.
When I switch to the Cable system, the duplicate fake DNS get replaced with the real cable DNS almost immediately, so you are right in that it is dynamic, and editing the conf file would do nothing.
At least I now understand what's happening. It has to be that Leopard asks for 2 DNS or that Verizon router offers the same IP twice.
I will have to look into the Verizon router a bit more to see if I can do something

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