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Full Discussion: netstat output
Special Forums IP Networking netstat output Post 302399714 by Ultrix on Monday 1st of March 2010 09:56:15 AM
Originally Posted by pludi
Which OS, and which command exactly? Because on those systems that I have access to netstat outputs nice headers that should be easy to understand if you know a bit about networking.
I'm using Mac OS X Leopard. The output looks something like this (shortened for brevity's sake):

Active Internet connections
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp4      37      0  CLOSE_WAIT
udp4       0      0        *.*                    
udp4       0      0  *.58916                *.*                    
udp4       0      0  *.52844                *.*                    
udp4       0      0  *.58444                *.*                    
udp4       0      0  *.52618                *.*                    
udp4       0      0  *.55354                *.*                    
udp4       0      0  *.54759                *.*                    
udp4       0      0  *.*                    *.*                    
udp6       0      0  michael-gables-m.ntp   *.*                    
udp6       0      0  localhost.ntp          *.*                    
udp4       0      0  localhost.ntp          *.*                    
udp6       0      0  localhost.ntp          *.*                    
udp6       0      0  *.ntp                  *.*                    
udp4       0      0  *.ntp                  *.*                    
udp4   15489      0  *.ipp                  *.*                    
udp6       0      0  *.mdns                 *.*                    
udp4       0      0  *.mdns                 *.*                    
udp4       0      0  *.*                    *.*                    
udp4       0      0  *.*                    *.*                    
icm6       0      0  *.*                    *.*                    
Active LOCAL (UNIX) domain sockets
Address  Type   Recv-Q Send-Q    Inode     Conn     Refs  Nextref Addr
 430ecc0 stream      0      0        0  581fee0        0        0 /var/run/mDNSResponder
 581fee0 stream      0      0        0  430ecc0        0        0
 42ee110 stream      0      0        0  430eee0        0        0 /var/run/mDNSResponder
 430eee0 stream      0      0        0  42ee110        0        0
 42dab28 stream      0      0        0  411fb28        0        0 /var/run/mDNSResponder

I don't know what any of this means. I'm not much of a networking person, and I only know a little bit about TCP/IP (like what DNS and DHCP are), so this doesn't make much sense to me.
Test Your Knowledge in Computers #667
Difficulty: Easy
IEEE 802 is a family of IEEE standards dealing with local area networks and metropolitan area networks.
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inet_type(4)							   File Formats 						      inet_type(4)

inet_type - default Internet protocol type SYNOPSIS
/etc/default/inet_type DESCRIPTION
The inet_type file defines the default IP protocol to use. Currently this file is only used by the ifconfig(1M) and netstat(1M) commands. The inet_type file can contain a number of <variable>=<value> lines. Currently, the only variable defined is DEFAULT_IP, which can be assigned a value of IP_VERSION4, IP_VERSION6, or BOTH. The output displayed by the ifconfig and netstat commands can be controlled by the value of DEFAULT_IP set in inet_type file. By default, both commands display the IPv4 and IPv6 information available on the system. The user can choose to suppress display of IPv6 information by setting the value of DEFAULT_IP. The following shows the possible values for DEFAULT_IP and the resulting ifconfig and netstat output that will be displayed: IP_VERSION4 Displays only IPv4 related information. The output displayed is backward compatible with older versions of the ifconfig(1M) and netstat(1M) commands. IP_VERSION6 Displays both IPv4 and IPv6 related information for ifconfig and netstat. BOTH Displays both IPv4 and IPv6 related information for ifconfig and netstat. The command-line options to the ifconfig and netstat commands override the effect of DEFAULT_IP as set in the inet_type file. For example, even if the value of DEFAULT_IP is IP_VERSION4, the command example% ifconfig -a6 will display all IPv6 interfaces. EXAMPLES
Example 1: Suppressing IPv6 Related Output This is what the inet_type file must contain if you want to suppress IPv6 related output: DEFAULT_IP=IP_VERSION4 SEE ALSO
ifconfig(1M), netstat(1M) SunOS 5.10 16 Jun 1999 inet_type(4)

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