netstat(1) General Commands Manual netstat(1)
NAME
netstat - Displays network statistics.
SYNOPSIS
/usr/sbin/netstat [-ARgrn | [-Aan] [-f address_family] [-p protocol]] [interval]
/usr/sbin/netstat [-adgHimMnRrstuv] [-f address_family] [-p protocol] [interval]
/usr/sbin/netstat [-dntz] [-I interface [-c | -s]] [interval]
The netstat command displays network-related data in various formats.
OPTIONS
Displays the state of sockets related to the Internet protocol. Includes sockets for processes such as servers that are currently listening
at a socket but are otherwise inactive. Displays either the address of any protocol control blocks associated with sockets or the
addresses of routing table entries with bitmasks. Typically, this option is used for debugging. Displays the number of dropped packets;
for use with the -I interface or -i options. You can also specify an interval argument (in seconds). Limits reports to the specified
address family. The address families that can be specified might include the following: Specifies reports of the AF_INET family, if present
in the kernel. Specifies reports of the AF_INET6 family, if present in the kernel. Specifies reports of the AF_UNIX family, if present in
the kernel. Lists information about all address families in the system. Lists information about any address families in the system. Dis-
plays statistics since the system was last booted. By default, the command displays statistics since they were last zeroed. Use this option
with the -p and -s options only. Displays the current ARP table (behaves like arp -a). Displays the state of configured interfaces.
(Interfaces that are statically configured into the system, but not located at system startup, are not shown.)
When used with the -a option, it displays IP (IPv4 and IPv6) and link-level addresses associated with the interfaces.
You can use the -i option to retrieve your system's hardware address. Displays information about the specified interface. Displays
the current access filter for the specified network interface. See ifaccess.conf(4) for more information. Displays the DNA Data
Link Layer counters for the specified network interface and the adapter's status and characteristics. See Network Administration
for a description of the display fields. Displays information about memory allocated to data structures associated with network
operations. Displays Internet protocol multicast routing information. When used with the -s option, it displays IP (IPv4 and IPv6)
multicast statistics. Displays network address in numerical format with network masks in CIDR format. When this option is not spec-
ified, the address is displayed as hostname and port number. This option can be used with any of the display formats. Displays
statistics for protocol, which you can specify as a well known name or an alias. Supported protocol names and their aliases are
listed in /etc/protocols. A null listing (0) means that there is no data to report. If routines to report statistics for a speci-
fied protocol are not implemented on this system, netstat reports that the protocol is unknown. Displays the host's routing tables.
When used with the -s option, shows the host's routing statistics instead of routing tables. Display's the host's routing tables on
each Resource Affinity Domain (RAD), if your system has NUMA-capable hardware. Displays statistics for each protocol. Displays
timer information; for use with the -I interface or -i options. Displays information about domain sockets (UNIX domain). Displays
more verbose output when specified with the -r option. In this case, route metric values are displayed. Sets the network interface
counters or protocol statistics counters to zero. This option must be specified with either the -I interface option or the -s or -p
options. In addition, you must be superuser to use this option.
DESCRIPTION
The interval argument specifies in seconds the interval for updating and displaying information. The first line of the display shows cumu-
lative statistics; subsequent lines show statistics recorded during interval.
Default Display
When used without options, the netstat command displays a list of active sockets for each protocol. The default display shows the following
items: Local and remote addresses Send and receive queue sizes (in bytes) Protocol State
Address formats are of the form host.port or network.port if a socket's address specifies a network but no specific host address. The host
and network address are displayed symbolically unless -n is specified.
Interface Display
The network interface display format provides a table of cumulative statistics for the following: Interface name Maximum Transmission Unit
(MTU) Network Address Packets received (Ipkts) Packets received in error (Ierrs) Packets transferred (Opkts) Outgoing packets in error
(Oerrs) Collisions
Note that the collisions item has different meanings for different network interfaces. Drops (optional with -d) Timers (optional
with -t)
Routing Table Display
A route consists of a destination host or network and a gateway to use when forwarding packets. Direct routes are created automatically for
each interface attached to the local host when you issue the ifconfig command. In addition, loopback routes are created automatically for
each interface address that is configured with the ifconfig command. Routes can be modified automatically in response to the prevailing
condition of the network.
The routing-table display format indicates available routes and the status of each in the following fields: Displays the state of the route
as one or more of the following: This is a cloned route. This route is a cloning route that was created by the route command. This route
was dynamically created by a redirect. Fragment to path MTU size is disabled on this route. This route is to a gateway. This route is to
a host. This route contains valid link-layer information. This route is a loopback route that was created by the kernel. This route was
modified by a redirect. Path MTU discovery is disabled on this route. This route was created by the Path MTU discovery process. This is
a reject route that was created by the route command. This is a static route that was created by the route command. Up, or available.
Gives the current number of active uses for the route. Connection-oriented protocols hold on to a single route for the duration of a con-
nection; connectionless protocols obtain routes in the process of sending to a destination. Provides a count of the number of packets sent
using the route. Indicates the network interface used for the route.
When the -v option is specified, the routing table display includes the route metrics. An asterisk (*) indicates the metric is locked.
See route(8) for additional information on routing.
DIAGNOSTICS
Verify that the kloadsrv daemon is running. If it is not, start it. See kloadsrv(8) for more information. Make sure that you have not
replaced the running kernel with a new kernel. You might need to reboot the system to correct this problem.
EXAMPLES
To show the state of the configured interfaces, enter: $ netstat -i To show the routing tables, enter: $ netstat -r
The resulting display looks like the following: Routing Tables Destination Gateway Flags Refs Use Interface Netmasks:
Inet 255.255.255.0
Route Tree for Protocol Family 2: default 16.55.5.5 UG 13 38618 ln0 localhost 16.55.5.4 UH 2 29
lo0 ethernet 16.55.5.3 U 98 66760 ln0
(Output may be formatted differently on your system.) To show the routing tables with network addresses, enter: $ netstat -rn
The resulting display looks like the following: Routing tables Destination Gateway Flags Refs Use Interface
Netmasks: Inet 0.0.0.0 Inet 255.0.0.0 Inet 255.255.0.0 Inet 255.255.252.0 Inet
255.255.255.0 Inet 255.255.255.224
Route Tree for Protocol Family 2: default 16.140.28.1 UG 0 6004465 tu0 16.140.128/24 16.140.128.198
U 4 181451 tu0 127.0.0.1 127.0.0.1 UH 0 0 lo0 194.224/16 127.0.0.1 UG
0 3 lo0 194.226/16 127.0.0.1 UGR 0 0 lo0 198.119.1/24 198.119.19.76 U 1
867 le0 198.119.19.64/27 198.119.19.76 U 0 1 le0 198.119.64.80 198.119.19.24 UGH 0 0
le0 130.200/16 16.140.128.1 UG 0 0 tu0 To produce the default display for network connections, enter:
netstat
The resulting display might include the following headings: Active Internet connections Proto Recv-Q Send-Q Local Address Foreign
Address (state) To set the ln0 interface counters to zero, enter: netstat -Iln0 -z To display IPv6 routing entries, enter: # net-
stat -rnf inet6
Routing tables Destination Gateway Flags Refs Use Interface
Route Tree for Protocol Family 26 default Link#8 UCL 0 0 ipt0 default Link#1
UCL 0 0 ln0 default fe80::a00:2bff:fe2d:2b2 UG 0 0 ln0 3ffe:1200:4110:1::/64 Link#1 UCL
0 0 ln0 3ffe:1200:4110:1:a00:2bff:fe2c:f632 Link#1 UH 1 0 ln0 fe80::/10 Link#8 UCL 0
0 ipt0 fe80::/10 Link#1 UCL 0 0 ln0 fe80::108c:1056 Link#8 UHLc 1 4
ipt0 fe80::108c:80e3 Link#8 UHLc 0 0 ipt0 fe80::a00:2bff:fe2d:2b2 Link#1 UHLc 1 0
ln0 ff02::/16 Link#1 UCL 0 0 ln0 ff02::/16 Link#8 UCL 0 0 ipt0
ff02::1 16.140.128.227 UHLVc 0 8 ipt0 ff02::1 33:33:0:0:0:1 UHLVc 0 3 ln0
ff02::2 33:33:0:0:0:2 UHLVc 0 1 ln0 ff02::2 16.140.128.227 UHLVc 1 2 ipt0
ff02::9 16.140.128.227 UHLVc 0 4 ipt0 To display active IPv6 connections, enter: # netstat -af inet6
Active Internet connections (including servers) Proto Recv-Q Send-Q Local Address Foreign Address (state) tcp
0 0 3ffe:1200:4110:1:a00:2bff:fe2c:f632.1054 host1.corp.com.telnet ESTABLISHED tcp 0 0 *.finger
*.* LISTEN tcp 0 0 *.telnet *.* LISTEN tcp 0 0
*.ftp *.* LISTEN
SEE ALSO
Commands: vmstat(1), route(8)
Network Administration
netstat(1)