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System Administration Guide: IP Services

ProcedureHow to Display the Status of Transport Protocols

You can display the status of the transport protocols through the netstat command. For detailed information, refer to the netstat(1M) man page.

  1. Display the status of the TCP and SCTP transport protocols on a system.


    $ netstat

  2. Display the status of a particular transport protocol on a system.


    $ netstat -P transport-protocol

    Values for the transport-protocol variable are tcp, sctp, or udp.

Example 7–6 Displaying the Status of the TCP and SCTP Transport Protocols

This example shows the output of the basic netstat command. Note that IPv4-only information is displayed.


$ netstat

TCP: IPv4
   Local Address     Remote Address    Swind Send-Q  Rwind Recv-Q      State
----------------- -------------------- ----- ------  ----- ------     -------
lhost-1.login      abc.def.local.Sun.COM.980 49640      0     49640    0 ESTABLISHED
lhost-1.login      ghi.jkl.local.Sun.COM.1020 49640     1     49640    0 ESTABLISHED
remhost-1.1014     mno.pqr.remote.Sun.COM.nfsd 49640    0     49640    0 TIME_WAIT
SCTP:                  
Local Address    Remote Address  Swind  Send-Q  Rwind  Recv-Q StrsI/O  State 
---------------- --------------  -----  ------ ------ ------  ------   -------
 *.echo            0.0.0.0            0       0 102400      0   128/1   LISTEN
 *.discard         0.0.0.0            0       0 102400      0   128/1   LISTEN
 *.9001            0.0.0.0            0       0 102400      0   128/1   LISTEN
Example 7–7 Displaying the Status of a Particular Transport Protocol

This example shows the results when you specify the -P option of netstat.


$ netstat -P tcp
   
TCP: IPv4
   Local Address     Remote Address    Swind Send-Q  Rwind Recv-Q      State
----------------- -------------------- ----- ------  ----- ------     -------
lhost-1.login      abc.def.local.Sun.COM.980 49640      0     49640    0 ESTABLISHED
lhost.login        ghi.jkl.local.Sun.COM.1020 49640     1     49640    0 ESTABLISHED
remhost.1014       mno.pqr.remote.Sun.COM.nfsd 49640    0     49640    0 TIME_WAIT

TCP: IPv6
 Local Address    Remote Address        Swind Send-Q Rwind Recv-Q   State If 
---------------- ---------------------- ------ ----- ------ ----------- -----
localhost.38983   localhost.32777       49152      0 49152      0 ESTABLISHED      
localhost.32777   localhost.38983       49152      0 49152      0 ESTABLISHED      
localhost.38986   localhost.38980       49152      0 49152      0 ESTABLISHED