loop create
set int ip address loop0 6.0.0.1/32
set int state loop0 up
set int state GigabitEthernet1b/0/0 up
set int ip address GigabitEthernet1b/0/0 192.168.1.1/24

create host-interface name vpp1
set int state host-vpp1 up
set int ip address host-vpp1 6.0.1.1/24

packet-generator new {						\
  name udp							\
  limit 512							\
  rate 1e4							\
  node ip4-input						\
  size 100-100							\
  interface loop0						\
  data {							\
   UDP: 192.168.1.2 - 192.168.2.255 -> 192.168.1.1		\
   UDP: 4321 -> 1234						\
    length 72							\
    incrementing 100						\
  }								\
}
session enable