Date: Tue, 4 Sep 2001 07:02:09 +0200 From: Barry Irwin <bvi@itouchlabs.com> To: =?iso-8859-1?Q?Mat=EEss_Elsbergs?= <matiss@bkc.lv> Cc: freebsd-isp@freebsd.org Subject: Re: Reverse DNS Message-ID: <20010904070208.Z54124@itouchlabs.com> In-Reply-To: <001701c134fd$9e2e76e0$0200a8c0@lv>; from matiss@bkc.lv on Tue, Sep 04, 2001 at 07:53:44AM %2B0300 References: <001701c134fd$9e2e76e0$0200a8c0@lv>
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On Tue 2001-09-04 (07:53), Matīss Elsbergs wrote: > > Is reverse in-addr.arpa authority necessary to normally operate a > nameserver and hold a domain name for a webserver, as an example? No, but again that depends. DNS comes in two parts: \Forward DNS This is the process that takes the human readible format such as www.example.com and maps it to the "computer friendly" format of the IP address that the host has such as 192.192.10.1 An example of the line in a zone file that would to this is: www IN A 192.192.10.1 You can have many DNS names resolving to the SAME IP address using either A or CNAME records ( read up elsewhere on the specifices of when to use each -sorry I dont have a reference handy) \Reverse DNS This pportion of dns is used for mapping the IP address back to the textual name. In order to do this the 'special' zone of in-addr.arpa is used. so to look up the reverse (otherwise known as the PRT - Pointer) record for an IP you in effect do a lookup for the IP address A.B.C.D as D.C.B.A.in-addr.arpa. An example of a reverse line in the 10.192.192.in-addr.arpa file would be: 1 IN PTR www.example.com. (note the trailing dot, without it things get nasty and 192.192.10.1 will end up resolving to www.example.com.10.192.192.in-addr.arpa ) Now to your question: You should not need to have the reverse entry in orderto be able to host the DNS for a forward domain. The reverse entries are ususally managed by ones ISP or connectivity provider, although they may delegate authority for certain records to you. but in most cases they will do it for you. Hope this helps Barry Systems Administrator (Security) Itouch Labs To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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