@454redhawk & zzzname,
Two seperate topics are being mixed up here:
1. Using the prepend line in dhclient.conf causes resolv.conf to have your prefered DNS addresses, in your prefered order & put your router/gateway's address last. Which I like better than making resolv.conf immutable, due to my preference of allowing the OS to write the correct information where & when it wants, rather than me having to take care of it.
2. The reason I offer OpenDNS's addresses in the how-to are manifold, they must also be considered bonus information to point 1. above:
* I link to the OpenDNS Start page - a clearly written & simple how-to configure many common routers which many people could find helpful at the least.
* Some may not know their ISP's DNS's so they can use OpenDNS's how-to & addresses until they contact their ISP.
* OpenDNS does provide a faster cleaner service than most of our ISP's, so linking to it in the how-to may open a door to better service, it atleast opens the door of opportunity.
* One can use OpenDNS via prepend as per the first post in this thread & not have to edit because their ISP has changed it's DNS addresses yet again, or because you have changed your ISP for that matter.
The very nature of computing & the super configurable Linux based OS's means that not everything works for everybody, if it did this forum would be miniscule in size by comparison with what it is now...
If OpenDNS doesn't work as well as your ISP's DNS, don't use it.
If prepend doesn't work for you, that's unfortunate, try making resolv.conf immutable.
Follow your preferences where you can...
The how-to has been written to help user's who do & don't, can & can't use OpenDNS, most specifically it demonstrates IMHO the cleanest solution for stabilising your chosen DNS addresses as I mentioned in point 1. of this post. (Circles)