and they only ConnectTo a third node outside the NAT,
which normally would prevent the peers from learning each other's LAN address.
-Currently, local discovery is implemented by sending broadcast packets to the LAN during path MTU discovery.
-This feature may not work in all possible situations.
+Currently, local discovery is implemented by sending some packets to the local address of the node during UDP discovery.
+This will not work with old nodes that don't transmit their local address.
@cindex LocalDiscoveryAddress
@item LocalDiscoveryAddress <@var{address}>
@file{@value{sysconfdir}/tinc/@var{netname}/hosts/} directory.
Setting this options also implicitly sets StrictSubnets.
+@cindex UDPDiscovey
+@item UDPDiscovery = <yes|no> (yes)
+When this option is enabled tinc will try to establish UDP connectivity to nodes,
+using TCP while it determines if a node is reachable over UDP. If it is disabled,
+tinc always assumes a node is reachable over UDP.
+Note that tinc will never use UDP with nodes that have TCPOnly enabled.
+
+@cindex UDPDiscoveryKeepaliveInterval
+@item UDPDiscoveryKeepaliveInterval = <seconds> (9)
+The minimum amount of time between sending UDP ping datagrams to check UDP connectivity once it has been established.
+Note that these pings are large, since they are used to verify link MTU as well.
+
+@cindex UDPDiscoveryInterval
+@item UDPDiscoveryInterval = <seconds> (2)
+The minimum amount of time between sending UDP ping datagrams to try to establish UDP connectivity.
+
+@cindex UDPDiscoveryTimeout
+@item UDPDiscoveryTimeout = <seconds> (30)
+If tinc doesn't receive any UDP ping replies over the specified interval,
+it will assume UDP communication is broken and will fall back to TCP.
+
@cindex UDPRcvBuf
@item UDPRcvBuf = <bytes> (OS default)
Sets the socket receive buffer size for the UDP socket, in bytes.
@cindex add
@item add @var{variable} @var{value}
As above, but without removing any previously existing configuration variables.
+If the variable already exists with the given value, nothing happens.
@cindex del
@item del @var{variable} [@var{value}]
from where it can be redirected to a file or piped through a program that can parse it directly,
such as tcpdump.
-@cindex network [@var{netname}]
-@item network
+@cindex network
+@item network [@var{netname}]
If @var{netname} is given, switch to that network.
Otherwise, display a list of all networks for which configuration files exist.
+@cindex fsck
+@item fsck
+This will check the configuration files for possible problems,
+such as unsafe file permissions, missing executable bit on script,
+unknown and obsolete configuration variables, wrong public and/or private keys, and so on.
+
+When problems are found, this will be printed on a line with WARNING or ERROR in front of it.
+Most problems must be corrected by the user itself, however in some cases (like file permissions and missing public keys),
+tinc will ask if it should fix the problem.
+
@end table
@c ==================================================================