How to FORCE FTP FROM a specific network card on AIX

It should choose the NIC based on the destination IP address and the routing table.

So just make sure that the route table uses that NIC for the IP address of the server you are going to.

Thank you giltjr for your quick reply.

I have never had to add a route after the initial installation in AIX.
Below is the netstat -rn from the system:
Routing tables
Destination        Gateway           Flags   Refs     Use  If   Exp  Groups

Route Tree for Protocol Family 2 (Internet):
default            10.82.100.254     UG        0     11561 en0      -      -
10.82.100.0        10.82.100.221     UHSb      0         0 en0      -      ->
10.82.100.0        10.82.100.222     UHSb      0         0 en1      -      ->
10.82.100/24       10.82.100.221     U        12    440561 en0      -      ->
10.82.100/24       10.82.100.222     U         8    315221 en1      -      -
10.82.100.221      127.0.0.1         UGHS      2       238 lo0      -      -
10.82.100.222      127.0.0.1         UGHS      0        74 lo0      -      -
10.82.100.255      10.82.100.221     UHSb      2       277 en0      -      ->
10.82.100.255      10.82.100.222     UHSb      1       108 en1      -      -
127/8              127.0.0.1         U         4     33077 lo0      -      -

Route Tree for Protocol Family 24 (Internet v6):
::1%1              ::1%1             UH        1       160 lo0      -      -

I need to go from AIX IP address 10.82.100.222 (en1) to Windows IP address 10.82.100.244.

Below is the add route screen:
  Destination TYPE                                    net                    +
* DESTINATION Address                                []
* Default GATEWAY Address                            []
  COST                                               [0]                
  Network MASK (hexadecimal or dotted decimal)       []
  Network Interface                                  []                      +
  (interface to associate route with)
  Enable Active Dead Gateway Detection?               no                     +
  Is this a Local (Interface) Route?                  no                     +
  Policy (for Multipath Routing Only)                 Default (Global)       +
  Weight (for Weighted Multipath Routing Policy)     [1]                      #
  Apply change to DATABASE only                       no                     +

I was going to answer the questions as follows:
  Destination TYPE                                    host                   +
* DESTINATION Address                                [10.82.100.244]
* Default GATEWAY Address                          [10.82.100.254] should this be 10.82.100.222
  Network Interface                                  [en1]                      +

Unfortunately this is a live system that I don't feel comfortable adding a route on the fly.
Any help you could provide in completing this screen would be appreciated.

Thanks,
Dan

Thanks giltjr for the quick reply.

I don't know if both are being used.  The system came in with the OS installed and IBM did the setup.

There are probably 30 users connecting to the AIX system using thin client.

Is there a way to tell if both en0 and en1 are in use?

Thanks,
Dan

Looking at some other doc, it looks like if AIX sees two interfaces in the same subnet by default it will use them both in round robin fashion.

If you setup the static route to use a specific interface it should use that interface for all traffic to that host/network.

Thank you giltjr for your help.
I will be adding the route tomorrow for testing.

Thanks,
Dan