I had a similar experience with the wireless network provided by a motel in the U.S. I tried a number of different systems and interfaces: rtw(4) in Lemote YeeLoong, run(4) on Lemote YeeLoong and IBM Thinkcentre, ath(4) on IBM ThinkPad A31p. All were running NetBSD 7.0_STABLE, except the Lemote Yeeloong, which was running whatever was -current as of mid- April 2016.
The motel's wireless was using plain old 128-bit WEP and while I could associate with an access point, DHCP requests were not answered. I tried both default 'dhcpcd' and 'dhclient'. I dug out my PowerBook G4 667MHz with MacOS X 10.4.11 on it and it was able to get an address without any problem. I've stayed at this same motel location every year for the last several years and it has always worked until this year. The desk clerk claimed there have been no changes to their system, but indicated that some clients using laptops "just can't connect" (and implied that smartphone users do not have any problem). -- |/"\ John D. Baker, KN5UKS NetBSD Darwin/MacOS X |\ / jdbaker[snail]mylinuxisp[flyspeck]com OpenBSD FreeBSD | X No HTML/proprietary data in email. BSD just sits there and works! |/ \ GPGkeyID: D703 4A7E 479F 63F8 D3F4 BD99 9572 8F23 E4AD 1645