CNAME question

[Barry Margolin]

In article <bvbnbg$1ig$1 at sf1.isc.org>, ikelozada at yahoo.com (ike lozada) 
wrote:

> C:\Documents and Settings\xal>ping smtp.azcom.net
> 
> Pinging azcom.net[202.172.3.56] with 32 bytes of data:

Where are you getting this from?  When I look up smtp.azcom.net, the 
name doesn't exist.  And azcom.net resolves to a different address.

> Reply from 202.172.3.56: bytes=32 time=208ms TTL=242
> Reply from 202.172.3.56: bytes=32 time=205ms TTL=242
> Reply from 202.172.3.56: bytes=32 time=203ms TTL=242
> 
> How could I make the reply come from "smtp.azcom.net" instead of
> "azcom.net?"

The name reported by ping comes from a reverse DNS lookup of the 
address.  So you need to change the PTR record to point to 
smtp.azcom.net.

However, since PTR records are required to point to primary names, not 
aliases, you would also have to change smtp.azcom.net from a CNAME to an 
A record.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA