DNS not resolving on one Mac but the other works fine in same local network

Snow Leopard is doing something strange to the DNS or the permission to ping.
I have 2 Macs on the same local network, connect through the same ISP (verizon FIOS). One has no problem resolving any domain, but the other is constantly not resolving some domains.
The problem progresses like this:
* All of a sudden, DNS is not resolving from Ethernet (when it did perfectly well a minute ago).
* Then I switched to wireless (using the same LAN), and it resolved fine.
* Then it failed completely a few minutes later.
* Then I reboot my Mac, and it seemed to clear that, and worked for a day.
* Then it failed again in both Ethernet and Wireless; rebooting does not fix it.
* I cleared all the caches using Onyx, did "dscacheutil -flushcache", zapped the PRAM, reinstalled 10.6.2 combo update, repaired the permission, nothing works.
* Since the unresolved domain is my own domain, I changed the nameserver, and waited for it to propagate to see if that may be the problem, since it appeared that it is not resolving the A Record, and I waited 72 hours, and it is not resolved or propagating to the local DNS, but it worked perfectly well on my other Mac within the same network.
* Then I added other DNS, such as google DNS 8.8.8.8 or openDNS servers to it, but it didn't fix anything.
* Then I "ping" either the unresolved domain or my own Mac .local, and it gave me the error "permission denied". (Whereas I have no problem pinging my own Mac or the unresolved domain in my other Mac that works!).
* Then I "sudo ping" the unresolved domain or my own Mac, and it pinged perfectly well.
* Then I tried "ping6" my own Mac or the unresolved domain on the broken Mac, and it worked fine!
* Also, I used http://network-tools.com to ping it, and noticed that during the trace, somewhere along the route through te7-2.dsr02.dllstx3.theplanet.com and po2.car04.dllstx5.theplanet.com, it timed out along the route, so I don't know if the timeout could have been causing the reject, but I doubted, because "sudo ping" locally will get through but "ping" does not.
So I think I traced the Snow Leopard DNS problem as follows:
* Why does "ping6" works, but "ping" permission is denied unless the user is root?
* I tried to "chmod 4755 ping" but it won't let me.
* Is it because DNS is resolving using IPv6 but not IPv4?
* Or is Snow Leopard somehow screwed up the permission to access ping or similar DNS service?
* Why DNS has no problem in one Mac but caused problem on the other Mac, even though they are in the same local network?
* The only difference between the Macs maybe because I have Parallels installed in the Mac that failed to resolve DNS (with the extra Parallels Shared Ethernet), which may be interfering with it, but I tried to turn Parallels Shared Ethernet off, and it did not fix the problem.
Can anyone help or have any idea that I can fix this nagging bug with DNS? The DNS had worked before, but it simply quit working all of a sudden, and nothing can resurrect it.
Thanks.

Shut down Parallels and restart w/o letting any of Parallels TCP/IP stack resurrect itself. So many network issues with VM solutions. See if the problem persists. Create a new account and ping from there. Are your search domains manually entered on the 10.6 box?

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