openvpn-tools with many clients

[emmanuelgeoffray]

Hello,

I am using openvpn-tools on a server with a vpn where I manage a list of ~ 70 clients.
I have some issues with the last added clients to connect to the vpn.
I found out in clients.list that last clients have an IP_ID of 289, 293 ....
When they succeed to connect, it is with overflowed IP, for exemple a client with an IP_ID of 273, will connect with IP 10.11.12.18
But that breaks the connection for the computer that has an IP_ID of 17.

I examined the openvpn-tools and from what I read, each IP_ID is in a sequence of + 4: 17, 21, 25, etc.
But only two slots are used:

    # Computing client IP ID.
    IP_ID=5
    while [ -n "$(command grep " ${IP_ID}$" "${INSTANCE_CLIENTS_LIST_PATH}")" ]; do
      IP_ID=$((${IP_ID} + 4))
    done

    # Add client to instance client list.
    echo "${CLIENT_LONG_NAME} ${IP_ID}" >> "${INSTANCE_CLIENTS_LIST_PATH}"

    # Create client advanced config file, and fixing IP.
    SERVER_SIDE_IP="${CURRENT_IP_RANGE}.$((${IP_ID} + 1))"
    CLIENT_SIDE_IP="${CURRENT_IP_RANGE}.${IP_ID}"

https://github.com/biapy/howto.biapy.com/blob/master/openvpn/openvpn-tools#L2340

Can I safely change from IP_ID=$((${IP_ID} + 4)) to IP_ID=$((${IP_ID} + 2)) ?

Thank you,
Emmanuel