Macbook won't connect with one particular router

[Mr Skills]

I recently sold my old MacBook to my brother. He has 2 PCs and 2 iPhones, both of which connect perfectly to the internet throught his modem/router (a BT Business Hub). The Mac, on the other hand, just won't connect to the internet. Airport connects to the router, but cannot load any web pages. Connecting by ethernet does not appear to help.

This Mac will happily connect to any other router except this one.

Is there some arcane setting somewhere that might fix this?

Thanks.

 

[miles01110]

Perhaps your brother is using static IPs or MAC access control, which is why your machine won't connect?

 

[Mr Skills]

Perhaps your brother is using static IPs or MAC access control, which is why your machine won't connect?

Is that something I need to change on the router on on the Mac?

 

[miles01110]

On the router.

 

[Mr Skills]

I would be surprised if anything like that was on because it is not blocking anything else from the system. For example, if I visit with my iPhone, that connects perfectly. Assuming we can work out how to switch those two things off in the router settings, how would that affect the rest of the network?