create packet-generator interface pg0
create packet-generator interface pg1
set int ip address pg1 192.168.2.1/24
set ip neighbor pg1 192.168.2.2 6:5:4:3:2:1 static
create gre tunnel dst 192.168.2.2 src 192.168.2.1 teb

set int state pg0 up
set int state pg1 up
set int state gre0 up
set int l2 xconnect pg0 gre0
set int l2 xconnect gre0 pg0

packet-generator new {						\
  name tx							\
  limit -1							\
  node ethernet-input						\
  size 64-64							\
  interface pg0							\
  data {							\
    0x8881: 4:4:4:4:4:4 -> 5:5:5:5:5:5				\
    incrementing 100						\
  }								\
}

packet-generator new {						\
  name rx							\
  limit -1							\
  node ip4-input						\
  size 72-72							\
  interface pg1							\
  data {							\
    GRE: 192.168.2.2 -> 192.168.2.1				\
      teb							\
        0x8881: 4:4:4:4:4:4 -> 5:5:5:5:5:5			\
        incrementing 100					\
  }								\
}

packet-generator enable