Are wireless access points bi-directional?

[Oldverse]

I'm trying to achieve this:

ComputerA - WiFi - ISP router - ethernet - wireless access point - WiFi - ComputerB

I've tried configuring both an old ISP router (HG533) and a raspberry pi as
wireless access points. In both cases, ComputerB could ping ComputerA, but A
can't ping B.

I don't know much about this subject, so I don't know if that's expected
behaviour, or if I've done something wrong, or failed to do something else
that's necessary.

Would a wireless access point such as TP-LINK TL-WA801ND solve this problem?

 

[bremen1874]

Connect the two computers using a cable and check they can ping each other before getting too involved with this. You may just need to adjust the firewall settings on one of them.

 

[Oldverse]

If A and B are both connected by wifi to the ISP router then they can see each
other. They both have addresses in the range 192.168.1.*, allocated by the
router's dhcp server. When B connects via the WAP, it gets a 192.168.2.*
address. I suspect that part of the problem is that the ISP router doesn't
know what to do with 192.168.2.* addresses.

 

[sja360]

Looks like your WiFi access point is giving out IP addresses, you'll need to set the access point to have a static ip in the router's ip range and allow the isp router to assign IP addresses.

 

[bremen1874]

If they’re getting IPs from different subnets both routers must both be configured as routers which is causing a double NAT situation.

You need to configure the second router as an access point. If it doesn’t have a built in AP mode Google ‘configure router as access point’.

 

[Oldverse]

I bought the wireless access point which I mentioned in my original query and it does the job. I expect the other options could have been made
to work by someone with more knowledge and patience than me, but I think the WAP is 20 quid well spent.