Date: Tue, 23 Jul 2013 09:26:20 +0100 From: Frank Leonhardt <frank2@fjl.co.uk> To: freebsd-questions@freebsd.org Subject: Re: dhcp server returns core dump when i define network with mask 8 Message-ID: <51EE3E2C.2090203@fjl.co.uk> In-Reply-To: <loom.20130723T095802-729@post.gmane.org> References: <CAA_1SgGFpBCnxWf4tKa3--nZiYhDgyiEcwvrfsUodxiOwMNfdg@mail.gmail.com> <loom.20130723T095802-729@post.gmane.org>
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On 23/07/2013 09:03, jb wrote: > s m <sam.gh1986 <at> gmail.com> writes: > >> ... >> subnet 192.0.0.0 netmask 255.0.0.0 { >> range 192.0.0.1 192.255.255.255; > The 'range' denotes IP addresses that can be allocated to clients. > The IP 192.255.255.255 is a reserved broadcast address for the network. > jb > > It's definitely "bad idea" to try to use it, but it doesn't explain the core dump. Also, using DHCP to dish out addresses that don't belong to you AND aren't on a private network (as defined by IANA) will probably lead to trouble. Valid private address ranges are: 10.0.0.0 - 10.255.255.255 (private class A) 172.16.0.0 - 172.31.255.255 (private class B x 16) 192.168.0.0 - 192.168.255.255 (private class C x 256) Which block you use is really a matter of taste - classes haven't been used in routing for quite a while so you can consider them all as straight blocks but I (for one) still treat them as classed just to help me visualise what's what. For example, I'll use one class C per site to prevent conflicts over VPN. 192.0.0.0/24 addresses are allocated to real hosts on the wider internet, although IIRC some of the lower ones are reserved for use in documentation (like example.com) - is that where the idea came from?!? :-) Regards, Frank.
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