SASYNCD.CONF(5) | File Formats Manual | SASYNCD.CONF(5)

# NAME

`sasyncd.conf` — configuration file for sasyncd

# DESCRIPTION

`sasyncd.conf` is the configuration file for the sasyncd(8) daemon.

The current line can be extended over multiple lines using a backslash (‘\’). Comments can be put anywhere in the file using a hash mark (‘#’), and extend to the end of the current line. Care should be taken when commenting out multi-line text: the comment is effective until the end of the entire block.

Since the file contains the shared secret key used to encrypt data between this host and the others, /etc/sasyncd.conf must be owned either by “root” or the “_isakmpd” pseudo user and be readable only by this owner, e.g.

    # chown root /etc/sasyncd.conf
    # chmod 0600 /etc/sasyncd.conf

The following configuration settings are understood:

`interface` interface
  Specify which carp(4) interface sasyncd(8) should track master/slave state on.
`group` group
  Specify on which interface group sasyncd(8) should increase the demotion counter. This has the effect of suppressing carp(4) preemption while initial sasyncd(8) state is established. The default is to use the “carp” group.

  For more information on interface groups, see the `group` keyword in ifconfig(8).

`flushmode sync` | `startup` | `never`
  Controls how the sasyncd(8) master host handles SADB_FLUSH messages to its slaves.

  `sync`
    Pass any SADB_FLUSH messages along. For example, in this mode sasyncd(8) will synchronize an `ipsecctl -F` command to all connected slaves. For more information, see ipsecctl(8).
  `startup`
    Send a SADB_FLUSH message to the slaves as they connect, and act as `sync` afterwards. This is the default.
  `never`
    Never send SADB_FLUSH messages.
`listen on` address [family] [`port` port]
  Specify a local IP address, hostname, or interface the sasyncd(8) daemon should listen on. The default is to listen on all local addresses. When using an interface name, family may be given as “inet” or “inet6” to only bind using the specified address family. Finally, port can be used to specify which TCP port sasyncd(8) should listen to. The default is to listen to port 500.
`mode master` | `slave`
  Force the daemon to run as master or slave. Normally only intended for debugging use.
`mode skipslave`
  Prevent the daemon from syncing SA or SPD messages where the source or destination address is one of the configured peers. Intended to permit IPsec pfsync(4) protection. This mode is experimental.
`peer` address
  Specify a sasyncd(8) peer IP address or hostname. May be specified multiple times. For example:

      peer 10.0.0.2
      peer 10.0.0.3
      peer 10.0.0.4

`sharedkey` key
  The shared AES key used to encrypt messages between sasyncd(8) hosts. This configuration setting is required and must be either 16, 24 or 32 bytes long (corresponding to AES using a 128, 192 or 256 bit key).
`control isakmpd` | `iked` | `all` | `none`
  By default, sasyncd(8) tracks its local master/slave mode and toggles the passive mode of isakmpd(8) accordingly. This option can be changed to control iked(8) instead, to control all supported daemons at the same time, or to turn it off to synchronize SAs only.

# FILES

/etc/sasyncd.conf
/etc/examples/sasyncd.conf

# SEE ALSO

chmod(1), carp(4), chown(8), ipsecctl(8), sasyncd(8)

# HISTORY

The `sasyncd.conf` file format first appeared in OpenBSD 3.8.

February 1, 2021 | Debian