out of place mx records.

[Andrey G. Sergeev (AKA Andris)]

Hello Gregory,


Thu, 28 Oct 2010 13:04:58 +1300 Gregory Machin wrote:

> Hi.
> I have taken over some dns servers, and the process of doing upgrade,
> half way through the process..
> 
> I have a question about the zone files , as there is some
> configuration here that I have not seen before and seems out of
> place.
> 
> here is an excerpt of the zone file
> 
> $TTL 14400
> 
> @		IN	SOA	example.com. postmaster.example.com. (
> 				2010042142	; Serial
> 				3600		; Refresh (1 hours)
> 				1200		; Retry   (20 minutes)
> 				1728000		; Expire  (20 days)
> 				14400     	; Minimum (4 hours)
>                                 )
> 		IN	NS	ns1.example.com.
> 		IN	NS	ns2.example.com.
> ;		IN	NS	ns1.catalyst.net.nz.
> 
> 		IN	MX	10 mail01.example.com.
> 		IN	MX	10 mail02.example.com.
> ;		IN	MX	20 mail03.example.com.
> 
> 		IN	A	202.xx.xx.2
> 
> ns1		IN	A	192.168.xx.xx	
> ns2		IN	A	192.168.xx.xx	
> 
> listserv        IN	A	202.xx.xx.2
> 		IN	MX	10	mcvpemr01	
> 		IN	MX	10	mcvpemr02	
> cache           IN	A	202.xx.xx.1
> 		IN	MX	10	mcvpemr01	
> 		IN	MX	10	mcvpemr02
> captaincomet	IN	A	202.xx.xx.1
> 		IN	MX	10	mcvpemr01
> 		IN	MX	10	mcvpemr02
> louie		IN	A	202.xx.xx.1
> 		IN	MX	10	mcvpemr01
> 		IN	MX	10	mcvpemr02
> mail01          IN      A       192.168.xx.xx
> 		IN	MX	10	mcvpemr01	
> 		IN	MX	10	mcvpemr02
> mail02          IN      A       192.168.xx.xx
> 		IN	MX	10	mcvpemr01	
> 		IN	MX	10	mcvpemr02
> nelson          IN	A	202.xx.xx.1
> 		IN	MX	10	mcvpemr01
> 		IN	MX	10	mcvpemr02
> 	
> 
> My question is why would "IN    MX    10    mcvpemr01" and "IN    MX
>  10    mcvpemr02" be repeated trough the zone file surely this is
> redundant ?

These MX record sets aren't redundant as they belong to the different
labels named "listserv", "cache" etc.


-- 

Yours sincerely,

Andrey G. Sergeev (AKA Andris)     http://www.andris.name/