On 10/11/2011 09:14 AM, Mike Horwath wrote:
This whole DNS thing on a router discussion is funny. It was a logical discussion to determine what is best for MICE. I'm sorry if you find it insignificant, but I'm glad that you found humor in it.
I can use DNS to figure out an area for the IP in question...
I can enter said IP into a separate query afterwards to find an area in question...
Which is faster for finding the info I am looking for? Be realistic.
I have used DNS in my routers and switches since IOS supported such. Funny, so has Doug :)
Sure, you can add latency to your output but it doesn't slow the packets down, and I sure as hell cannot memorize the Internet to figure out which city I am in or which provider I'm crossing.
That extra few ms here and there still outruns copy/paste click submit every time.
Do a traceroute that has a few hops that haven't set up their PTR records properly. (Or in a VRF with no DNS, etc). You will wait a while for each hop to resolve. You are correct in that it doesn't slow the packets down on the network. However, it greatly delays the time between packets. It changes from a few ms to several seconds per hop (default timeout can be changed with "ip domain timeout"). Add this up for a couple of hops and you must be really slow at copy/paste for it to be worse. I know that everyone should have all of their PTR records setup properly, but it doesn't happen that way in the real world.
Perhaps a company could run dedicatd nameservers for their networking gear, or just run better nameservers on their infrastructure. Dedicated/better name servers won't solve anything when there is no valid PTR record.
Yah, i know that sounds condescending but I don't know a better way to phrase this this morning.
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