Routing Protocols in the Solaris OS
Solaris system software supports two routing protocols: Routing Information Protocol (RIP) and ICMP
Router Discovery (RDISC). RIP and RDISC are both standard TCP/IP protocols.
Routing Information Protocol (RIP)
RIP is implemented by in.routed, the routing daemon, which automatically starts when the
system boots. When run on a router with the s option specified, in.routed
fills the kernel routing table with a route to every reachable network and
advertises “reachability” through all network interfaces.
When run on a host with the q option specified, in.routed extracts routing
information but does not advertise reachability. On hosts, routing information can be extracted in
Do not specify the S flag (capital “S”: “Space-saving mode”). in.routed builds a full routing table exactly as it does on a router.
Specify the S flag. in.routed creates a minimal kernel table, containing a single default route for each available router.
ICMP Router Discovery (RDISC) Protocol
Hosts use RDISC to obtain routing information from routers. Thus, when hosts are
running RDISC, routers must also run another protocol, such as RIP, in order
to exchange router information.
RDISC is implemented by in.routed, which should run on both routers and hosts.
On hosts, in.routed uses RDISC to discover default routes from routers that
advertise themselves through RDISC. On routers, in.routed uses RDISC to advertise default routes
to hosts on directly-connected networks. See the in.routed(1M) man page and
the gateways(4) man page.