Search Again: Re: Only allow certain clients to do lookups From: Men & Mice Support Date: Wednesday, October 27, 2004 Time: 11:46:40 am At 12:22 AM -0700 10/27/04, Scott Haneda wrote: >on 10/26/04 11:21 PM, Men & Mice Support at cbuxton@menandmice.com wrote: > >>> I tried to >>> read about this in the manual, but it is somewhat vague as to >>>what it really >>> does. My guess is the entire world will at some time or another >>>need to ask >>> something of my DNS server, so this settings mere existence confuses me >>> other than to block known abusers? >> >> Use this setting to permit authorized users to send recursive queries >> to your server (meaning, permit authorized users to ask your server >> to do work). Anyone else's query will have the "rd" flag (recursion >> desired) ignored. > >Thanks, I think I am starting to get this. The instructions say I can enter >in a range of Ip's, which would be nice since I don't want to enter in 64 IP >addresses, how do you define a range? I am assuming it is the "/" notation, >for which I never really understood how that works at all. Yes, it's the "/" notation. To understand this notation, you have to think in binary bits. An IP address is 32 bits long. A subnet mask is also 32 bits long - a certain number of 1's followed by the rest in 0's. The count of 1's (in decimal) is the "length" of the mask - it's the number after the "/". The mask represents the number of bits all addresses in the range have in common. For example, a 24 bit subnet mask means that all addresses in the subnet share the first 24 bits - each octet is 8 bits, hence the name "octet". So a 24 bit mask means a class C subnet. A block of about 64 addresses (actually there are 62 usable addresses in such a subnet, due to the routing and broadcast numbers) is a 26 bit subnet. And the number you list at the start is the routing number, which is always 1 less than the lowest-numbered address in the range. So if the range is 192.168.1.65 through 192.168.1.126, the subnet is written as 192.168.1.64/26. If that's not sufficiently clear, then tell us about the range you want to enter. Chris Buxton Men & Mice - Making DNS Easy Customer Service and Sales Engineer

Messages In This Thread: Only allow certain clients to do lookups by Scott Haneda on Oct 26, 2004 at 8:44:53 pm Re: Only allow certain clients to do lookups by Men & Mice Support on Oct 26, 2004 at 9:22:53 pm Re: Only allow certain clients to do lookups by Scott Haneda on Oct 26, 2004 at 9:32:15 pm Re: Only allow certain clients to do lookups by Men & Mice Support on Oct 26, 2004 at 9:44:46 pm Re: Only allow certain clients to do lookups by Scott Haneda on Oct 26, 2004 at 10:17:54 pm Re: Only allow certain clients to do lookups by mattb on Oct 26, 2004 at 10:33:13 pm Re: Only allow certain clients to do lookups by Men & Mice Support on Oct 26, 2004 at 11:22:54 pm Re: Only allow certain clients to do lookups by Scott Haneda on Oct 27, 2004 at 12:23:35 am Re: Only allow certain clients to do lookups by Men & Mice Support on Oct 27, 2004 at 11:46:40 am