Synch problem with iPad/iTunes

Hi, this may be outside the subject area of this forum so if it is just tell me and I'll ask in Apple Land.
As I've been setting up my network under the suggestions of Keith Beddoe and I've got my network up and running it seems worth asking here first!
I'm happy with my new net but I've got something odd happening that I didn't have with my old setup.
I have an iPad and I used to turn it on, open iTunes on my desktop and they could talk to one another wirelessly. I also use various apps which want to synch with my desktop too.
They can no longer talk to one another.
Now I *did* back in the mists of time have a similar problem where they could not talk. This was down to my AVG firewall on the desktop which I had to whitelist the ip address of the ipad. This was easy to know it was the firewall as if I turned the firewall off... it all worked!
Not this time.
This is all to do with the vaguaries of Apple's "bonjour" system which seems to be fussy to say the least.
My IP table looks like this:
192.168.1.254 Home Hub (i.e. default)
192.168.1.64 iPad (i.e. the first address that was given out by DHCP and set to always use this).
192.168.1.63 TP-Link TL-WA701ND (in client mode to receive the HH signal and forward it.)
192.168.1.71 desktop machine
There are other devices on the net but these are the ones of interest.
For Internet access, for printing, for everything else this just works fine.
I know the WA701ND is in the non-DHCP portion of the addresses so I've also tried it at 192.168.1.200 - just in case it made a difference (shouldn't do but you never know!).
I've tried the desktop machine plumbed directly into the WA701ND and also going into the 5 port switch TL-SF1005D and then into the WA701ND.
So whether the desktop goes into a switch and then to the client mode WA701ND and whether the address of the latter is in or out of the DHCP table range doesn't seem to matter. Nor does having the AVG firewall on or off (and I've whitelisted both the IP address of the WA701ND and of the iPad in the AVG firewall anyway).
In all cases:
1. I can not see the desktop machine in the http://bthomehub.home/ control panel > Advanced Settings > Home Network > Devices (or in the DHCP table list).
2. I can easily ping the desktop machine from the iPad and vice versa, and can FTP files to the iPad.
3. Apple's Bonjour system will not allow the two devices to see one another.
This seems to be something blocking Bonjour but I can't see what it might be. I can't spot any firewall setup in either the WA701ND or in the HomeHub system that might cause problems.
Has anyone else had issues with Bonjour and Home Hub? I searched and could not see anything.
At the moment I can, of course, attach the iPad directly to the desktop and synch music but that does not cover my apps which synch documents and are somewhat vital.
Suggestions welcome!  Thanks.

Keith, yup that's what I figured and why I kept it out of the DHCP range but I was trying it in the DHCP range just in case, when plugged directly into the desktop computer, it showed up as *its* card. It didn't!
I'm not a Mac user either - PC is my area.
When I first searched I searched on iPad and also on iTunes. I found more hits searching both here and elsewhere on Bonjour and Home Hub. It seems Bonjour is very similar to DLNA and UPnP. Having found a few hits searching on AirPlay and AirPrint found me a few more.
I found some people solve similar issues turning of WPA2 and just using WPA. I tried turning security to WPA on both WA701ND and on HH3. No better.
I found some people say that turning OFF UPnP in the HH3 settings worked. Not for me.
I found some people say they got rid of their HH3 and replaced it with a different cable router. Mmmm not about to try that any time soon.
Whether WPA2 is relevant or not is not clear. Another factor was multicasting - apparently HH3 does not allow it and Bonjour relies on it.
And yet despite this some folk had it working just fine and others didn't! Go figure.
I'll work out an alternative way of using the iPad I think. For the stuff I use I can probably get around it rather than fix it!
Frustrating given that two weeks ago it was all ticking along smoothly. (i.e. before Infiinty installation)

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