User`s guide

Configuring IP Routing
Managing the routing table
Pipeline User’s Guide Preliminary January 30, 1998 2-27
Fields in the routing table
The columns in the routing table display the following information:
• Destination
The Destination column indicates the target address of a route. To send a
packet to this address, the Pipeline will use this route. Note that the router
will use the most specific route (having the largest netmask) that matches a
given destination.
• Gateway
The Gateway column specifies the address of the next hop router that can
forward packets to the given destination. Direct routes (without a gateway)
do not have a gateway address.
•IF
The Interface column shows the name of the interface through which a
packet addressed to this destination will be sent.
– bh0 is the black-hole interface. It has an IP address of 127.0.0.3. Packets
routed to this interface are discarded silently.
– ie0 is the Ethernet interface.
– lo0 is the loopback interface.
– local. Routes pointing to local machines are labeled local. These include
the following routes, with a single w.x.y.z route for each local IP
address:
127.0.0.1/32 - local CP 0 0 0 59593
224.0.0.1/32 - local CP 0 0 0 59593
224.0.0.2/32 - local CP 0 0 0 59593
w.x.y.z/32 - local CP 0 0 0 59593
– mcast. Routes to 224.0.0.1 and 224.0.0.2 represent the multicast
addresses for all systems on the local subnet and all routers on the local
subnet, respectively, and are never forwarded. All multicast addresses
(except for addresses 224.0.0.1/32 and 224.0.0.2/32) point to the mcast
interface.
224.0.0.0/4 - mcast CP 0 0 0 59593