Int 61  u - Pc/tcp Kernel V2.05 - Nop For Slip Kernel                      [N]

   AH = function
       31h "net_add_route"
       32h "net_del_route"
       33h "net_dump_routes"

Notes: these functions are described as "unused" in the v2.2 documentation
   router configuration can be altered using INT 61/AH=01h
   this function is not supported by Beame&Whiteside's BWPCTCP v3.0a shim