chaining MX

[Matus UHLAR - fantomas]

On 26.05.10 18:09, rams wrote:
> I have mx records with chaining as follows.
> mx.chain.td3497.com.    86400    IN    MX    34 mx1.chain.td3497.com.
> mx1.chain.td3497.com.    86400    IN    MX    34 mx2.chain.td3497.com.
> mx2.chain.td3497.com.    86400    IN    MX    34 mx3.chain.td3497.com.
> mx3.chain.td3497.com.    86400    IN    A    1.2.3.4
> 
> Now if i query for domain "mx.chain.td3497.com. " with type MX or any, did
> we get chain in answer ? or did we get only specific domain pointed mx
> record.

No. This will not work even. The path is:

<domain> MX <pref> <host>
<host>   A         <IP>

in the above you define mx1.chain.td3497.com. as MX server for
mx.chain.td3497.com. but you don't provide A for mx1.chain.td3497.com.
therefore MX lookup for mx.chain.td3497.com. will fail.

mx3.chain.td3497.com. is an MX for mx2.chain.td3497.com. and
mx3.chain.td3497.com. has configured address, to mail for
<anything>@mx2.chain.td3497.com. will go to 1.2.3.4


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