i havnt had much luck with wesside-ng. i tried 2 different cards and from my bcm43xx i get:
bt ~ # wesside-ng -i eth1 -v 00:11:50:31:1F8
[21:57:51] Using mac 00:14:A5:F6:52:13
[21:57:51] WARNING: Appending in wep.cap
[21:57:51] Looking for a victim...
[21:57:51] Found SSID(dd-wrt) BSS=(00:11:50:31:1F8) chan=11
[21:57:51] Authenticated
[21:57:51] got assoc 19
bt ~ #

and from my rt2570 i get:
bt ~ # wesside-ng -i rausb0 -v 00:11:50:31:1F8
[22:01:27] Using mac 00:18:F8:AD:61:9F
[22:01:27] WARNING: Appending in wep.cap
[22:01:27] Looking for a victim...
[22:01:30] Found SSID(dd-wrt) BSS=(00:11:50:31:1F8) chan=11
[22:01:30] Authenticated
[22:01:30] Authenticated
[22:01:30] Authenticated
[22:01:30] Authenticated
[22:01:31] Authenticated
[22:01:31] Authenticated
[22:01:31] Authenticated
[22:01:31] Authenticated
[22:01:31] Authenticated
[22:01:31] Authenticated
[22:01:31] Authenticated
[22:01:31] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:31] Authenticated
[22:01:31] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:31] Authenticated
[22:01:32] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:32] Authenticated
[22:01:32] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:32] Datalen 46 Known clear 8
[22:01:32] Got 8 bytes of prga IV=(12:2d:75) PRGA=9A 3A 03 12 EB 59 6A 80
[22:01:32] Authenticated
[22:01:32] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:32] Authenticated
[22:01:32] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:32] Authenticated
[22:01:32] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:32] Authenticated
[22:01:32] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:32] Authenticated
[22:01:32] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00
[22:01:32] Authenticated
[22:01:32] ERROR Max retransmists for (30 bytes):
B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00

and the [22:01:32] Authenticated [22:01:32] ERROR Max retransmists for (30 bytes): B0 00 FF 7F 00 11 50 31 1F D8 00 18 F8 AD 61 9F 00 11 50 31 1F D8 00 00 00 00 01 00 00 00jus keeps repeating untill i ^c