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3-8 October 22, 1999 SP Switch Router Adapter Guide - 1.4 Update 2
Monitoring and Management Tools
Using the netstat command
Using the netstat command
The UNIX netstat command reports status and information about SP Switch Router media
card physical interfaces. netstat is available from the CLI and the UNIX shell.
– netstat -r -s prints routing statistics
– netstat -i -n shows all configured interfaces
– netstat -a -n prints a list of all active connections
– netstat -g -n prints the multicast route table
– netstat -r -n prints the current table of installed routes
In the output from netstat -r -n, the => symbol next to a route means it is a duplicate
key, but with a different netmask.
– netstat -rn | wc -l returns the number of entries in the routing table, here is an
example of a 50-entry table:
# netstat -rn | wc -l
50
– netstat -s prints comprehensive statistics for protocols, including: IP, ICMP, TCP, and
UDP, and GRIT, GRIEF, and GRID for SP Switch Router entities.
Refer to the man page for a complete list of netstat options. Examples of netstat usage follow.
netstat -rn
Use this netstat command to determine that the SP Switch Router Adapter card has the correct
routing table entries. You must have properly configured routing table entries so that TCP/IP
packets can be routed to and from the SP system to the SP Switch Router Adapter card. Use
netstat with the -rn options to view the card’s current routing table entries:
# netstat -rn
Routing tables
Internet:
Destination Gateway Flags Refs Use Interface
default 129.40.85.126 UGS 3 19356 tn0
127.0.0.1 127.0.0.1 UH 0 19 lo0
129.40.85.64/26 link#1 UC 0 0 tn0
129.40.85.121 0:c0:f2:0:26:8a UHL 4 490 lo0
129.40.85.126 0:0:a2:1:ff:e8 UHL 1 2 tn0
129.40.85.128/26 129.40.85.130 U 0 0 gt020
129.40.158.128/26 129.40.158.139 U 0 88652 gt030
129.40.192.128/26 129.40.192.139 U 0 34 gt060
224/8 link#1 UC 0 0 tn0
In the netstat -rn output, you will see the routing entries for the various SP Switch Router
Adapters installed in the SP Switch Router. In the example above there are three. These are
identified by their Interface names having the form gt0y0 where y is the number of the
chassis slot in which a specific SP Switch Router Adapter is installed. For more information on
the logical interface naming convention, refer to Chapter 2.
Each Interface in the netstat -rn output should correspond to at least one route that
specifies the reachable network in the Destination column. The TCP/IP address of the SP