# meter acct_out size 4096 { meta iif . ip6 saddr timeout 600s counter }
acct_out test-ip6 31
acct_out test-ip6 0
ip6 test-ip6 input
  [ meta load iif => reg 1 ]
  [ payload load 16b @ network header + 8 => reg 9 ]
  [ dynset update reg_key 1 set acct_out timeout 600000ms expr [ counter pkts 0 bytes 0 ] ]

# meter acct_out size 12345 { ip6 saddr . meta iif timeout 600s counter }
acct_out test-ip6 31
acct_out test-ip6 0
ip6 test-ip6 input
  [ payload load 16b @ network header + 8 => reg 1 ]
  [ meta load iif => reg 2 ]
  [ dynset update reg_key 1 set acct_out timeout 600000ms expr [ counter pkts 0 bytes 0 ] ]