[ietf78-tech] Impact of long leases on IPv4 DHCP address ranges for wireless

[Rob Nagy]

I have seen expanding dhcp ranges while live cause weird client issues. Te clients have the wrong broadcast at that point and don't correct until T1 of their existing lease unless you bump their connections. Let's just get them sized right in the first place. As I am guessing I will handle DHCP just let me know and it's no big deal. 

Agree with Cheliott that it's a VLAN sizing issue really. The DHCP is trivial. 


Alice

Sent from my iPhone

On Jul 8, 2010, at 7:02 PM, Geert Jan de Groot <geertj at psg.com> wrote:

> On Thu, 8 Jul 2010 18:50:36 -0400 Chris Elliott wrote:
>> Are we going to need to expand our v4 DHCP address ranges and probably also 
>> our subnet sizes because we are planning on much longer DHCP leases to 
>> support authentication?
> 
> Perhaps start with a longer prefix (router would be .1, yes?),
> and if the pool would run short, remove a bit from the subnet mask
> and start assigning from the space we'll then have added.
> 
> The advantage being that if the subnet has low polulation, the longer
> prefix would also get less background noise from the Internet,
> resulting in ARP broadcast traffic.
> I remember something like 100-200kbit/sec on our /19 in Kigali and,
> like the beacons, they'd be sent slow-speed.
> 
> If you guys have a way around this, I'd be very interested,
> it's a (growing) concern for AfNOG networks.
> 
> GJ
> 
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