+ ipif
+ Command to run to create and communicate with local network
+ interface. Passed to sh -c. Must speak SLIP on stdin/stdout.
+ The following additional interpolations aare substituted:
+ %(local)s %(peer)s %(rnet)s %(ifname)s
+ on server <vaddr> <vrelay> <vnetwork> <ifname_server>
+ on client <client> <vaddr> <vroutes> <ifname_client>
+ ["userv root ipif %(local)s,%(peer)s,%(mtu)s,slip %(rnets)s"]
+
+ On server: applies to all clients; not looked up in
+ client-specific sections.
+ On client: may be different for different servers.
+