Search Again: Re: reverse lookups From: Men & Mice Support Date: Thursday, April 20, 2000 Time: 6:37:58 am At 8:53 AM -0400 4/20/00, David Ross wrote: >Changing the subject slightly. > >I'm still learning and the DNS & Bind book is on my to do list so I'm >asking for a bit of advice. > >One of the xDSL ISPs I'm looking at (CAIS) will not do revers lookups >unless you get a full class C from them. Normally they give a business >only 16 or 32 IPs. So does this mean w/o the 256 IPs (at and extra $50 >per month) I'll have trouble in the future running mail services? Plus >if I don't get the 256 now I'm sure I'll have to "move" if I get them later. > >This restriction was relayed to me by the sales folks supposedly from >the technical staff. I'm half suspicious the techs don't want to bother >or is there more to it? They're just being lazy. It's easy enough for them to delegate part of a class C subnet (i.e. a "classless" subnet) to your DNS servers, but they probably don't want to deal with educating their customers; the customer side of a classless subnet delegation can be confusing. You might ask them if they understand how classless subnet delegation works; you might also mention that, if they'll set up their end of it, you can set up your end without their help. (Just ask us if you need help.) The RFC that describes how classless subnet delegation works is 2317. <http://www.faqs.org/rfcs/rfc2317.html> If your reverse records aren't in place and correct, yes, you'll probably end up having some trouble with mail service. One way or another, you should have accurate reverse records for your IP addresses. ____________________________________________________________________ Chris Buxton cbuxton@menandmice.com Men & Mice http://www.menandmice.com Makers of: QuickDNS Pro

Messages In This Thread: Reverse Lookups by Blake Clements on Nov 5, 1998 at 9:42:00 pm Re: Reverse Lookups by Sam Lewis on Nov 5, 1998 at 10:27:00 pm Re: Reverse Lookups by Blake Clements on Nov 5, 1998 at 11:05:00 pm Re: Reverse Lookups by Sam Lewis on Nov 5, 1998 at 11:15:00 pm Re: Reverse Lookups by Blake Clements on Nov 5, 1998 at 11:24:00 pm Re: Reverse Lookups by Sam Lewis on Nov 6, 1998 at 12:34:00 am reverse lookups by Scott Tudor on Apr 18, 2000 at 8:23:58 am Re: reverse lookups by Global Homes Webmaster on Apr 18, 2000 at 10:19:19 am Re: reverse lookups by Men & Mice Support on Apr 19, 2000 at 2:53:22 am Re: reverse lookups by Global Homes Webmaster on Apr 19, 2000 at 11:00:03 am Re: reverse lookups by Men & Mice Support on Apr 20, 2000 at 1:44:56 am Re: reverse lookups by David Ross on Apr 20, 2000 at 6:06:30 am Re: reverse lookups by Men & Mice Support on Apr 20, 2000 at 6:37:58 am Reverse lookups by Micaela Carr on May 25, 2000 at 12:36:27 pm Re: Reverse lookups by Global Homes Webmaster on May 25, 2000 at 1:12:28 pm Re: Reverse lookups by Micaela Carr on May 25, 2000 at 2:25:44 pm Re: Reverse lookups by Global Homes Webmaster on May 25, 2000 at 2:56:36 pm