Which interface?

[n00ne]

Which interface should I use for target WiFi clients for example with urlsnarf?

br-lan    Link encap:Ethernet  HWaddr 00:C0:CA:A5:D6:EF
          inet addr:172.16.42.1  Bcast:172.16.42.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:28982 errors:0 dropped:4304 overruns:0 frame:0
          TX packets:15641 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:8814833 (8.4 MiB)  TX bytes:4876981 (4.6 MiB)

eth0      Link encap:Ethernet  HWaddr 00:C0:CA:A5:D6:EF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29170 errors:0 dropped:22 overruns:0 frame:0
          TX packets:16458 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:9399722 (8.9 MiB)  TX bytes:4899803 (4.6 MiB)
          Interrupt:4

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:288 errors:0 dropped:0 overruns:0 frame:0
          TX packets:288 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:28947 (28.2 KiB)  TX bytes:28947 (28.2 KiB)

wlan0     Link encap:Ethernet  HWaddr 00:C0:CA:A5:C2:41
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:431 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13523 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:48129 (47.0 KiB)  TX bytes:1523036 (1.4 MiB)

wlan0-1   Link encap:Ethernet  HWaddr 02:C0:CA:A5:C2:41
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13271 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:1450186 (1.3 MiB)

wlan1mon  Link encap:UNSPEC  HWaddr 00-C0-CA-A5-CD-78-00-44-00-00-00-00-00-00-00-00
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:636221 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:158496475 (151.1 MiB)  TX bytes:0 (0.0 B)

 

[m40295]

for clients connected to the pineapple  use br-lan  which is the lan interface 

 

 

[Forkish]

Wifi clients are connected to wlan0.  Management wifi is wlan01.

Be aware though, br-lan will also pick up any data (including yours; wlan01) that runs through the pineapple.