Sounds like you have wireless isolation turned on.

Maybe ... I know that reserved or fixed IPs should be "seen" when the DHCP server allocates a new IP but problems can and do occur. With plenty of address availabe for a home network it is nice to have a plan for which IPs are used in which context and I have often found that it is better to have the reserved or fixed IPs outside the allocatable range.

For example:

Router xxx.xxx.xxx.8

DHCP range: xxx.xxx.xxx.64 to xxx.xxx.xxx.191

Then reserve or fix IPs in the xxx.xxx.xxx.192 to xxx.xxx.xxx.240 for printers, TVs, alarms &c
and use xxx.xxx.xxx.16 to xxx.xxx.xxx.63 for devices such as switches, additional WAPs.

In reply to a post by BatBoy:

Sounds like you have wireless isolation turned on.

Do you know where in the router this gets turned on and off? I have not seen such an option.

Also, why does the router allow wifi access to the internet but not to the printers? Wouldn't isolation block both?

Thanks.

You said earlier:

In reply to a post by cutehenry:

The printers are set to static IPs.

Does this mean that you set them static at the printers or are you just meaning that you just reserved them at the router after its DHCP allocated IPs for them?

In reply to a post by cutehenry:

I have not seen such an option.

There isn't one.

Yes, either strategy will work. As long as you just use the router to do all IP allocation, and not the individual devices, it is a centralised and cleaner solution.

Not always possible though. Alarm systems often need the IP address hard coding and it is not an easy job to change it (as i know), similarly with using 2wire2700s as WAPs - they need to have their address defined internally and that is why I allow the non allocatable ranges where I can either tell the DHCP server to allocate a specific reserved address or have it fixed in the device.

OK, where you can't, you can't, but in general with most common devices you can.

It's definitely of benefit to have fixed IP addresses outside of the DHCP range that can be allocated by the router. I know the HH3 functions better when this is done.

In my case the numbers chosen mean something too so it is easy to remember.

240 - 24 port switch
216 - a small remote switch in the shed which has Gbit back to the house.
222 - second port on the unlocked modem