configuration file for
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:
- Specify which carp(4) interface sasyncd(8) should track master/slave state on.
- 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
For more information on interface groups, see the
groupkeyword in ifconfig(8).
- Controls how the sasyncd(8) master host handles SADB_FLUSH messages to its
- Pass any SADB_FLUSH messages along. For example, in this mode
sasyncd(8) will synchronize an
ipsecctl -Fcommand to all connected slaves. For more information, see ipsecctl(8).
- Send a SADB_FLUSH message to the slaves as they connect, and act as
syncafterwards. This is the default.
- Never send SADB_FLUSH messages.
listen onaddress [family] [
- 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.
- Force the daemon to run as master or slave. Normally only intended for debugging use.
- 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.
- 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
- 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).
- 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.
chmod(1), carp(4), chown(8), ipsecctl(8), sasyncd(8)
sasyncd.conf file format first
appeared in OpenBSD 3.8.