thanks for your detail answer. but again my goal is to have separate nat ip pool per output interface. in my case i have one in interface and two out if, i want out if1 uses nat ip address A and out if2 uses nat ip address B. using vrf routes and tables affect selected tx_fib_index but address allocation for snat(nat_ed_alloc_addr_and_port function) is based on rx_fib_index.
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