Ubuntu Manpage: joold - Userspace Session Synchronization (SS) daemon for NAT64 Jool.

NAME

       joold - Userspace Session Synchronization (SS) daemon for NAT64 Jool.

DESCRIPTION

       This command is deprecated, and it's now implemented as a wrapper for jool session proxy.  See jool(8).

SYNTAX

       joold [NETSOCKET] [MODSOCKET] [PORT]

OPTIONS

       NETSOCKET
              Path to JSON file containing the network socket's configuration.
              Defaults to "netsocket.json".

       MODSOCKET
              Path to JSON file containing the Netlink socket's configuration.
              Defaults to "modsocket.json".

       PORT   If present, starts an UDP server bound to port PORT, where the daemon serves stat counters.

NETWORK SOCKET CONFIGURATION

The file is a JSON-formatted collection of keyvalues.

multicast address=<IPv6-or-IPv4-address>
IP Address the SS traffic will be sent to and listened from.
Mandatory; has no default.

multicast port=<port-or-service-name>
TCP port where the SS traffic will be sent to and listened from.
Mandatory; has no default.

in interface=<String>
If multicast address is IPv4, this should be one addresses from the interface where the SS traffic
is expected to be received. If multicast address is IPv6, this should be the name of the interface
(eg. "eth0").
Optional. Defaults to be automatically assigned by the kernel.
It is strongly recommended that you define this value to ensure the SS traffic does not leak
through other interfaces.

out interface=<String>
If multicast address is IPv4, this should be one addresses from the interface where the multicast
traffic is expected to be sent. If multicast address is IPv6, this should be the name of the
interface (eg. "eth0").
Optional. Defaults to be automatically assigned by the kernel.
It is strongly recommended that you define this value to ensure the SS traffic does not leak
through other interfaces.

ttl=<INT>
Time-to-live of packets sent out by this socket.

NETLINK SOCKET CONFIGURATION

       The file is a JSON-formatted collection of keyvalues.

       instance=<String>
              Name of the instance the daemon is supposed to synchronize. It's the one you designate during jool
              instance add.
              The instance is expected to exist within the same network namespace the daemon is running in.
              As usual, it defaults to "default".

EXAMPLES

       IPv6 version:

            $ # All Jool instances should have the basic configuration.
            $ jool --file same-config-as-everyone-else.json
            $
            $ # Configure the SS interface
            $ ip addr add 2001:db8:ff08::4/96 dev eth0
            $ ip link set eth0 up
            $
            $ # joold
            $ cat ipv6-netsocket.json
              {
                 "multicast address": "ff08::db8:64:64",
                 "multicast port": "6464",
                 "in interface": "eth0",
                 "out interface": "eth0",
                 "ttl": 3
              }
            $
            $ cat modsocket.json
              { "instance": "default" }
            $
            $ joold ipv6-netsocket.json modsocket.json 45678 &

       IPv4 version:

            $ # All Jool instances should have the basic configuration.
            $ jool --file same-config-as-everyone-else.json
            $
            $ # Configure the SS interface
            $ ip addr add 192.0.2.1/24 dev eth0
            $ ip link set eth0 up
            $
            $ # joold
            $ cat ipv4-netsocket.json
              {
                 "multicast address": "233.252.0.64",
                 "multicast port": "6464",
                 "in interface": "192.0.2.1",
                 "out interface": "192.0.2.1",
                 "ttl": 3
              }
            $
            $ cat modsocket.json
              { "instance": "default" }
            $
            $ joold ipv4-netsocket.json modsocket.json 45678 &

       Request stats:

            $ echo "" | nc -u 127.0.0.1 45678
            KERNEL_SENT_PKTS,4
            KERNEL_SENT_BYTES,208
            NET_RCVD_PKTS,0
            NET_RCVD_BYTES,0
            NET_SENT_PKTS,4
            NET_SENT_BYTES,208

EXIT STATUS

       Zero on success, non-zero on failure.

AUTHOR

       NIC Mexico & ITESM

REPORTING BUGS

       https://github.com/NICMx/Jool/issues

KNOWN BUGS

       1. Maybe the daemon should be able to automatically enable SS on the kernel module.

       To  be perfectly honest, the main reason why fixing this isn't in the radar is because joold is giving me
       the impression that nobody is using it.

COPYRIGHT

       Copyright 2025 NIC Mexico.
       License: GPLv2 (GNU GPL version 2)
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to  the  extent
       permitted by law.