Co z toho plyne? 1IP na dva stroje?

[Martin Mares]

Hello, world!

> http://svet.namodro.cz = 194.149.101.67
> ...
> 194.149.101.67 = www.gradace.cz
> ...
> www.gradace.cz ~ www.ice.cz
>
> Co z toho plyne? Asi nic.

| mj at albireo:~$ host -a www.ice.cz.
| www.ice.cz              A       195.212.192.2
| mj at albireo:~$ host -a www.gradace.cz
| www.gradace.cz          A       195.212.192.2
| mj at albireo:~$ host -a svet.namodro.cz
| svet.namodro.cz         CNAME   www.namodro.cz
| www.namodro.cz          A       194.149.101.67
| mj at albireo:~$ host -i 194.149.101.67
| 67.101.149.194.in-addr.arpa     PTR     www.gradace.cz
| mj at albireo:~$ host -i 195.212.192.2
| 2.192.212.195.in-addr.arpa PTR record not found, server failure

   Z toho napriklad plyne, ze spravce prislusnych name-serveru si prilis nelame
hlavu s prohresky proti RFC...

	[1] Reverzni mapovani 194.149.101.67 je nekonsistentni.

	[2] Dva A recordy na jednu IP adresu (z toho by opet plynul
	    nekonsistentni reversni resolving, kdyby ovsem nejaky na teto
	    adrese vubec fungoval).

				Have a nice fortnight
--
Martin `MJ' Mares   <mj at ucw.cz>   http://atrey.karlin.mff.cuni.cz/~mj/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
"...take my advice, I don't use it anyway."