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comment { overlay interface }
create packet-generator interface pg0
set int ip address pg0 192.168.1.1/24
set int ip address pg0 192:168:1::1/64
set ip neighbor pg0 192.168.1.2 1:2:3:4:5:6 static
set ip neighbor pg0 192:168:1::2 1:2:3:4:5:6 static
set int state pg0 up

comment { underlay interface }
create packet-generator interface pg1
set int ip address pg1 192.168.2.1/24
set int ip address pg1 192:168:2::1/64
set ip neighbor pg1 192.168.2.2 6:5:4:3:2:1 static
set ip neighbor pg1 192:168:2::2 6:5:4:3:2:1 static
set int state pg1 up

comment { gre4 over ipv6 }
create gre tunnel dst 192:168:2::2 src 192:168:2::1
set int ip address gre0 127.1.0.1/32
ip route add 192.168.3.0/24 via gre0
set int state gre0 up

comment { gre6 over ipv4 }
create gre tunnel dst 192.168.2.2 src 192.168.2.1
set int ip address gre1 ::2/128
ip route add 192:168:3::0/64 via gre1
set int state gre1 up

packet-generator new {						\
  name gre4-tx							\
  limit -1							\
  node ip4-input						\
  size 64-64							\
  interface pg0							\
  data {							\
    UDP: 192.168.1.2 -> 192.168.3.1				\
    UDP: 4321 -> 1234						\
      length 128 checksum 0 incrementing 1			\
  }								\
}

packet-generator new {						\
  name gre4-rx							\
  limit -1							\
  node ip6-input						\
  size 72-72							\
  interface pg1							\
  data {							\
    GRE: 192:168:2::2 -> 192:168:2::1				\
      ip4							\
        UDP: 192.168.3.1 -> 192.168.1.2				\
        UDP: 1234 -> 4321					\
          length 128 checksum 0 incrementing 1			\
 }								\
}

packet-generator new {						\
  name gre6-tx							\
  limit -1							\
  node ip6-input						\
  size 64-64							\
  interface pg0							\
  data {							\
    UDP: 192:168:1::2 -> 192:168:3::1				\
    UDP: 4321 -> 1234						\
      length 128 checksum 0 incrementing 1			\
  }								\
}

packet-generator new {						\
  name gre6-rx							\
  limit -1							\
  node ip4-input						\
  size 72-72							\
  interface pg1							\
  data {							\
    GRE: 192.168.2.2 -> 192.168.2.1				\
      ip6							\
        UDP: 192:168:3::1 -> 192:168:1::2			\
        UDP: 1234 -> 4321					\
          length 128 checksum 0 incrementing 1			\
 }								\
}

packet-generator enable