[WOT] Warning - long winded discussion - was Re: Apple iPad announcement evokes yawn
bobs at twft.com
Fri Mar 9 10:24:04 CST 2012
It sounds like there is more than one DHCP server, and that the other is rejecting the lease requests, but the way DHCP is supposed to work is, all servers respond with a DHCP offer, and the first one the client sees it uses. There is information in the broadcast traffic to indicate which server the client has accepted. If an offer is not acknowledged by a client, it is dropped.
If you can get ahold of a 3rd party DHCP server that allows you to set up static IP addresses, you can just turn off the other DHCP servers and use that. I use IPNetRouterX, which is a full blown software router and firewall, and I just turn off the router and use the built in DHCP server. It's $100 though. I have a 400+ node network so it's worth it for me to control who gets what IP.
On Mar 9, 2012, at 7:54 AM, Kay C Lan wrote:
> On Fri, Mar 9, 2012 at 1:36 PM, Jerry Jensen <jhj at jhj.com> wrote:
>> Which device is serving DHCP? Where does it get ITS IP#? How are the DHCP
>> served addresses set up? Be sure there is only ONE DHCP server on your
>> network. Everything else should bridge.
> The TimeCapsule issues the LAN DHCP IPs and it get's it's WAN IP from a ISP
> provided modem. The two Airport Expresses are set to 'Extend a wireless
> As stated before the current range of IP addresses (set in the TimeCapsule
> via Airport Utility - with the Expresses set to 'Extend a wireless network'
> mode there are no further setting available) is set to 30 a comfortable
> buffer over the number of devices. I don't think there is any point in
> setting it to 200 as basically what happens is, for instance, my iPhone
> always gets the same 10.x.x.xx IP allocated to it, if there are 10 devices
> on the network it gets a 169.xx.xx.xx IP and I can't do anything, as soon
> as someone logs off, if I switch the iPhone WiFi off and back on, it will
> be allocated the 10.x.x.xx DHCP IP it normally has. This is the same be it
> a desktop, PB, whatever.
> Note, I don't manually specify IP addresses, although I have tried it and
> it doesn't seem to make any difference. I leave the TimeCapsule to
> automatically assign IPs and it just seems to always allocate the same
> number to the same device. At this stage I've never seen (not that I
> thoroughly looked every single time) the last couple of IP address in the
> range allocated to any device - the TimeCapsule appears to have started
> with lowest number in the range and sequentually allocated numbers to each
> and every device. I don't run out of numbers, I just don't get the ones I'm
> suppose too.
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