Multiple domains pointed to the same IP
Jeff Cochran
naplesweb at gulfcoast.net
Thu Dec 9 15:23:00 UTC 1999
>>I understand that there can only be one entry in the PTR file which gives
>>one domain name for a given IP address when a reverse lookup is performed.
>
>>Does this mean you cannot have mutiple domains map to a single IP on the
>>Internet e.g.:
>
>>one.mydomain.com -> 192.1.2.3
>>one.anotherdomain.com -> 192.1.2.3
>
>As far as I know, multiple PTR are legal, but usually not recommended.
>
>You can have multiple A or CNAME pointing to A for a name, but the PTR
>only needs to point to one name. Usually I find one preferred name.
What about systems that check the reverse DNS to allow access, for FTP
for example? If I have two domains:
foo.bar.com 192.1.2.3
foo.bar.net 192.1.2.3
but it would be the same 2.1.192.in-addr-arpa file with:
192.1.2.3 foo.bar.com
I would assume a reverse from foo.bar.net would go to foo.bar.com,
correct?
How about if the foo.bar.net entry was a CNAME to foo.bar.com? Would
this correct the situation since the reverese would show foo.bar.com
with an alias of foo.bar.net?
Jeff
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