> DNS is provided via ISP and local wireless clients seem to discover dns
> provided they can either connect to DHCP server direct or are given fixed
IP

Seem to discover? Uh, this isn't something to be vague about.

I'd much rather have centralized DHCP. One added benefit to this is being
able to better diagnose networking problems using DHCP leases. The machines
boot themselves as DHCP but get the same IP address every time. This way if
a device is acting up it should be easy to find via logs and such. That and
you can easily see any new devices as they'll show up as new leases, not
reservations.

There's another point to consider, if you've got fifty machines then you've
got the chance that all routers may, at some point, have to issue leases to
every one of them. Just how large are the subnets?

Feh, the headaches of managing multiple routers aren't worth it. Turn it
off on them and use a centralized one with leases instead.