[dns-wg] lameness and unreachability

On lördag, maj 24, 2003, at 22:21 Europe/Stockholm, Brad Knowles wrote:

> At 5:52 PM +0200 2003/05/24, Patrik Fältström wrote:
>
>>  - Look up all A records for each MX
>>  - Look up all IP addresses for each A
>>  - Try to connect to port 25 for every A (every A must respond, but 
>> only
>>    one IP address per A)
>
> 	A records *are* IP addresses.  Do you mean reverse lookups?

Grrr....it was very much evening when I wrote it. The above doesn't 
make sense.

What I do is:

(1) Query for all MX records, and get back domain names
(2) Query for all A records for every domain name
(3) Try to connect to port 25 for every domain name one have

I.e. "look up all A records for each MX" means "gather all domain names 
from all MX records".

Yes, I know it didn't make any sense.

Sorry.

The code is available at http://dnscheck.paf.se/

    paf