orjail do not honors the "-r, --routing" option

[Roberto-MN]

I typed the following line at the terminal:
sudo orjail -v -s -r 10.200.219.2 10.200.219.1 30

When I check the IPs by typing "ifconfig -a", the IPs shown are not those typed in the command line, are random IPs. I tried to correct this defect by editing the "orjail" file and putting an "if" to test the command line values. The code stretch was as follows:

  if [ "${IPHOST}x" = "x" -a "${IPNETNS}x" = "x" ];then
    # generate a random available address from specified subnet mask
    set +e
    USEDADDR=$(ip addr show type veth| grep -Po 'inet \d+.\d+.\K(\d+)')
    for available_subnet in $(shuf -i 1-255 -n 254); do
      if ! echo "$USEDADDR" | eno grep "^$available_subnet$"; then
        break
      fi
    done
    set -e
    IPHOST=${IPHOSTMASK//x/$available_subnet}
    IPNETNS=${IPNETNSMASK//x/$available_subnet}
  fi

Is it right? Can I do this?