vnet/etc/scripts/icmp6

packet-generator new {
  name x
  limit 1
  node ip6-input
  size 64-64
  no-recycle
  data {
    ICMP6: ::1 -> ::2
    ICMP echo_request
    incrementing 100
  }
}

tr add pg-input 100
ip route ::1/128 via local
ip route ::2/128 via local