The descriptions to configure TCP/IP on OS/400 version V4R1M0 running on a AS/400 is beyond the scope of this document.
1) To perform any communications configuration tasks on your AS/400, you must have the special authority of *IOSYSCFG (I/O System Configuration) defined in your user profile. You can check the characteristics of your user profile with the DSPUSRPRF command.
2) Type GO CFGTCP command th reach the Configure TCP/IP menu.
3) Select Option 2 - Work with TCP/IP Routes.
4) Enter a 1 on the Opt field to add a route. * In Route Destination type *DFTROUTE * In Subnet Mask type *NONE * In Type of Service type *NORMAL * In Nex Hop type the address of your gataway (the Linux box)