[dns-wg] lameness and unreachability
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Patrik Fältström
paf at cisco.com
Sun May 25 07:56:25 CEST 2003
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
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