Bridge and gateway: two in one

What do I have:

  • two SXT 2
  • localnet connection on first SXT (network 192.168.10.0/24)
  • some computers on second SXT (network 192.168.20.0/24)
    What do I want:
  • to bridge SXTs by nv2
  • to make first SXT accessable by 192.168.20.1 (and that address will be used by all computers in 192.168.20.0/24 as a default gateway) and 192.168.10.10 (for to be a gateway 192.168.10.1 client)
  • make 192.168.20.0/24 accessable by all computers in 192.168.0.0/16
    Where and what I have to set up?