strongswan/conf/plugins/dhcp.opt

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charon.plugins.dhcp.force_server_address = no
Always use the configured server address.
Always use the configured server address. This might be helpful if the DHCP
server runs on the same host as strongSwan, and the DHCP daemon does not
listen on the loopback interface. In that case the server cannot be reached
via unicast (or even 255.255.255.255) as that would be routed via loopback.
Setting this option to yes and configuring the local broadcast address (e.g.
192.168.0.255) as server address might work.
charon.plugins.dhcp.identity_lease = no
Derive user-defined MAC address from hash of IKE identity and send client
identity DHCP option.
charon.plugins.dhcp.server = 255.255.255.255
DHCP server unicast or broadcast IP address.
charon.plugins.dhcp.use_server_port = no
Use the DHCP server port (67) as source port when a unicast server address
is configured.
Use the DHCP server port (67) as source port, instead of the DHCP client
port (68), when a unicast server address is configured and the plugin acts
as relay agent. When replying in this mode the DHCP server will always send
packets to the DHCP server port and if no process binds that port an ICMP
port unreachables will be sent back, which might be problematic for some
DHCP servers. To avoid that, enabling this option will cause the plugin to
bind the DHCP server port to send its requests when acting as relay agent.
This is not necessary if a DHCP server is already running on the same host
and might even cause conflicts (and since the server port is already bound,
ICMPs should not be an issue).
charon.plugins.dhcp.interface
Interface name the plugin uses for address allocation.
Interface name the plugin uses for address allocation. The default is to
bind to any (0.0.0.0) and let the system decide which way to route the
packets to the DHCP server.