packet-generator new {						\
  name x							\
  limit 1							\
  node ip4-input						\
  size 64-64							\
  data {							\
    ICMP: 1.2.3.4 -> 5.6.7.8					\
    ICMP echo_request						\
    incrementing 100						\
  }								\
}

tr add pg-input 100
set interface ip source-check pg/stream-0
ip route 1.2.3.4/32 via pg/stream-0 0x01020304
ip route 5.6.7.8/32 via drop