The short and curlies of vista networking

[Glen Barber]

On Thu, Jun 18, 2009 at 5:51 PM, Tim Judd<tajudd at gmail.com> wrote:
> Replies inline
>
> On 6/18/09, Mel Flynn <mel.flynn+fbsd.questions at mailing.thruhere.net> wrote:
>> On Thursday 18 June 2009 10:27:44 Tim Judd wrote:
>>> Long ago in 2007, I saw a M$ article that describes that Vista has an
>>> extremely short delay period to get an IP.  If it doesn't get it
>>> within 1 second, it gives up (and maybe tries again).  Common DHCP
>>> servers ping an IP address, wait 1 second for a reply, and if no
>>> reply, assumes the IP is available and leases it to the booting
>>> computer.
>> ISC-dhcpd doesn't work that way. It keeps a lease db and assumes it's db is
>> the authority on available iP's for the range.
>
> dhcpd.conf(5)
> search for ping-check or ping-timeout
>
> http://www.freebsd.org/cgi/man.cgi?query=dhcpd.conf&apropos=0&sektion=5&manpath=FreeBSD+7.2-RELEASE+and+Ports&format=html
>
>
>>
>>> Is your DHCP server authoritative?
>>
>> Yes:
>> authoritative;
>> ddns-update-style interim;
>>
>> subnet 192.168.2.0 netmask 255.255.255.0 {
>>     range 192.168.2.200 192.168.2.254;
>>
>>     option subnet-mask 255.255.255.0;
>>     option broadcast-address 255.255.255.255;
>>     option domain-name "lan.rachie.is-a-geek.net";
>>     option domain-name-servers 192.168.2.51;
>>     option routers 192.168.2.1;
>>
>>     option ntp-servers 192.168.2.10;
>>     option wpad "http://192.168.2.100/proxy.pac";
>>
>>     # Dynamic DNS setup
>>       <snipped for brevity>
>> }
>
> A broadcast of 255.255.255.255 is misconfigured (not saying it's not
> gonna work, I'm saying for your network, it's not configured right).
> you need broadcast-address 192.168.2.255
>

That is not 100% correct.  By default, dhclient will send an initial
DHCPREQUST to 0.0.0.0 (meaning "this network").  The request is picked
up from the DHCP server broadcasting on 255.255.255.255.



-- 
Glen Barber