<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Howard Wilkinson wrote: <blockquote cite="mid:48592D16.6010001@cohtech.com" type="cite"> <meta http-equiv="Content-Type" content="text/html; "> <meta name="Generator" content="MS Exchange Server version 6.0.6619.12"> <title>Re: DNS: Question about setting abc.com record</title>  Daniel B. Thurman wrote: > > I have several DNS servers and wondered if the following > record entry is properly set for all of my DNS servers: > > $TTL 172800 > @ IN SOA ns1.abc.com. admin.abc.com. ( > 1 ; serial > 3H ; refresh > 15M ; retry > 1W ; expiry > 1D ) ; minimum > ;============ Nameserver ================ > @ IN NS ns1.abc.com. > @ IN NS ns2.abc.com. > @ IN NS ns3.abc.com. > ;============ Mail Exchange ============= > @ IN MX 10 mail1.abc.com. > @ IN MX 20 mail2.abc.com. > @ IN MX 30 mail3.abc.com. > @ IN TXT v=spf1 a mx -all > ;============ Hosts ====================== > @ IN A 10.1.0.1 > mail1 IN A 10.1.0.1 > mail2 IN A 10.1.0.2 > mail3 IN A 10.1.0.3 > ns1 IN A 10.1.0.1 > ns2 IN A 10.1.0.2 > ns3 IN A 10.1.0.2 > ;======================================== > > In particular, I am focusing on record: > @ IN A 10.1.0.1 > > The reason I have set all of my DNS zones for the above record > for all of my DNS servers is because if had I set this record for the > actual localhost IP address, it appears that if I send mail on the > localhost, the localhost would receive the email I sent. For example, > sending mail to: <a class="moz-txt-link-abbreviated" href="mailto:joe@abc.com">joe@abc.com</a> would be received at the localhost instead > of being sent to mail{1,2,3}.abc.com. Worse, any localhost programs > attempting to send emails to <a class="moz-txt-link-rfc2396E" href="mailto:root@abc.com">"root@abc.com"</a> would fail to be delivered > to one of the MX list. > > So, the question is, must each DNS server have it's own real IP address > in the '@' record? If so, how do I get around this? > > Kind regards, > Dan > Dan, do you have any other services with the network address 10.1.0.1 which you want to refer to as 'abc.com'? If not you do not need the 'A' record just after the Hosts line. Otherwise for a simple internal network this look reasonable. However, do you not have any other hosts you need to address? If so the you need their 'A' records. Howard. </blockquote> Yes, I have services at 10.1.0.1 as well as at several other hosts. The main reason that I use the @ is so that I can use 'abc.com' such as <a class="moz-txt-link-abbreviated" href="mailto:dan@abc.com">dan@abc.com</a> or to simply type abc.com in the web-browser's URL line and it would get resolved. What I found was, if I was at host one.abc.com, which had a DNS server and had @ record set to it's own IP address, and a local account "dan", sending mail to <a class="moz-txt-link-abbreviated" href="mailto:dan@abc.com">dan@abc.com</a> would be received locally instead of being delivered according to the MX records. That is why I set the @ record for all of my DNS servers to the same IP address and not to each DNS servers actual IP address. Does this make sense? Thanks! Dan </body> </html>