Ignoring unqualified MX's ?
barmar at bbnplanet.com
Fri Mar 24 19:38:02 UTC 2000
In article <8bge8r$vda$1 at newsflash.concordia.ca>,
Anne Bennett <anne at alcor.concordia.ca> wrote:
>Now I'm confused. Since time immemorial (well, OK, about a decade)
>I've been configuring all my name servers to answer authoritatively for
> 127.0.0.1 PTR localhost.
> localhost. A 127.0.0.1
>I'm *quite* sure that I read copious documentation and I'm supposed to
>be doing that. Has practice changed? Have I (and countless others)
>been misunderstanding the documentation for years? Or am I
>misunderstanding your post just now?
The PTR record is commonly done, but the A record isn't. For instance,
take a look at the sample named configuration in Chapter 4 of the DN&BIND
Usually, the "localhost" name is entered as an A record in the local
domain. When people type "localhost" as a hostname, the resolver typically
appends the local default domain, and it gets resolved to an address.
I suppose there are environments where you may need the localhost TLD A
record. If you're using software that performs an IP spoofing check after
performing reverse resolution of 127.0.0.1, you need a correponding A
record. However, you would probably do better in that case to have the PTR
record point to localhost.<yourdomain> rather than creating the localhost
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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