Search Again: Re: How Are CNAME Records Cached? From: Men & Mice Support Date: Tuesday, December 14, 1999 Time: 4:06:00 am At 3:17 PM -0700 12/13/99, Warren Michelsen wrote: >The recent discussion re: "Missing A records and slow resolution" >got me to wondering how CNAME records are cached. If >"originalDomain.com" has A records and "virtualDomain.com" has only >CNAME records pointing to the corresponding A records at >originalDomain.com, and Joe user browses to both of these domains, >how does the name server that his browser used store these lookups >in cache? As an address for originalDomain.com and as an alias for >virtualDomain.com? > >Or are both stored as the actual address so that both can be served >from cache on the next request for each? > >Since I'm undergoing my second renumbering of IP addresses in 5 >months, I've been seriously thinking about using A records only in >my "originalDomain.com". But I am concerned about speed of response. >So, after the initial lookup that gets an entry into the cache, is >there any difference between using A or CNAME records? CNAME records are cached as such, not as A records. However, the resolver will usually send both records, if both are cached, when an A record is requested for the virtual domain. ____________________________________________________________________ Chris Buxton cbuxton@menandmice.com Men & Mice http://www.menandmice.com Makers of: QuickDNS Pro

Messages In This Thread: How Are CNAME Records Cached? by Warren Michelsen on Dec 13, 1999 at 10:17:00 pm Re: How Are CNAME Records Cached? by Men & Mice Support on Dec 14, 1999 at 4:06:00 am