int create-ethernet
int create-sub fake-eth0 1
set int state fake-eth0 up
set int state fake-eth0.1 up

packet-generator new {
  name x
  limit 1
  node ethernet-input
  interface fake-eth0
  size 64-64
  data {
    IP4: 1.2.3 -> 4.5.6 vlan 1
    ICMP: 1.2.3.4 -> 5.6.7.8
    ICMP echo_request
    incrementing 100
  }
}

tr add pg-input 100
ip route 5.6.7.8/32 via local
ip route 1.2.3.4/32 via local