Flags
-A
Shows the address of any protocol control blocks associated with the sockets. This flag acts with the default
display and is used for debugging purposes.
-a
Shows the state of all sockets. Without this flag, sockets used by server processes are not shown.
-c
Shows the statistics of the Network Buffer Cache.
The Network Buffer Cache is a list of network buffers that contain data objects that can be transmitted to
networks. The Network Buffer Cache grows dynamically as data objects are added to or removed from it. The Network
Buffer Cache is used by some network kernel interfaces for performance enhancement on the network I/O. The netstat
-c command prints the following statistic:
Network Buffer Cache Statistics:
Current total cache buffer size: 0
Maximum total cache buffer size: 0
Current total cache data size: 0
Maximum total cache data size: 0
Current number of cache: 0
Maximum number of cache: 0
Number of cache with data: 0
Number of searches in cache: 0
Number of cache hit: 0
Number of cache miss: 0
Number of cache newly added: 0
Number of cache updated: 0
Number of cache removed: 0
Number of successful cache accesses: 0
Number of unsuccessful cache accesses: 0
Number of cache validation: 0
Current total cache data size in private segments: 0
Maximum total cache data size in private segments: 0
Current total number of private segments: 0
Maximum total number of private segments: 0
Current number of free private segments: 0
Current total NBC_NAMED_FILE entries: 0
Maximum total NBC_NAMED_FILE entries: 0
-C
Shows the routing tables, including the user-configured and current costs of each route. The user-configured cost
is set using the -hopcount flag of the route command. The current cost may be different than the user-configured
cost if Dead Gateway Detection has changed the cost of the route.
In addition to the costs of the route, it also shows the weight and policy information associated with each route.
These fields are applicable only when the Multipath Routing Feature is used. The policy information displays the
routing policy that has been currently selected to choose between the multiple routes available. The policies
available are:
* Default - Weighted Round Robin (WRR)
* Hashed (HSH)
* Random (RND)
* Weighted Random (WRND)
* Lowest Utilization (LUT)
The weight field is a user-configured weight associated with the route that will be used for Weighted Round-Robin
and Weighted Random Policies. For more information about these policies, see the no command.
-D
Shows the number of packets received, transmitted, and dropped in the communications subsystem. Note: In the
statistics output, a N/A displayed in a field value indicates the count is not applicable. For the NFS/RPC
statistics, the number of incoming packets that pass through RPC are the same packets that pass through NFS, so
these numbers are not summed in the NFS/RPC Total field, thus the N/A. NFS has no outgoing packet or outgoing
packet drop counters specific to NFS and RPC. Therefore, individual counts have a field value of N/A, and the
cumulative count is stored in the NFS/RPC Total field.
-f AddressFamily
Limits reports of statistics or address control blocks to those items specified by the AddressFamily variable. The
following address families are recognized:
inet
Indicates the AF_INET address family.
inet6
Indicates the AF_INET6 address family.
unix
Indicates the AF_UNIX address family.
-g
Shows Virtual Interface Table and Multicast Forwarding Cache information. If used in conjunction with the -s flag,
it will show the multicast routing information.
-i
Shows the state of all configured interfaces. See "Interface Display." Note: The collision count for Ethernet
interfaces is not supported.
-I Interface
Shows the state of the configured interface specified by the Interface variable.
-M
Shows network memory's mbuf cluster pool statistics.
-m
Shows statistics recorded by the memory management routines.
-n
Shows network addresses as numbers. When this flag is not specified, the netstat command interprets addresses where
possible and displays them symbolically. This flag can be used with any of the display formats.
-o
Used in conjunction with the -a flag to display detailed data about a socket, such as socket options, flags, and
buffer statistics.
-p Protocol
Shows statistics about the value specified for the Protocol variable, which is either a well-known name for a
protocol or an alias for it. Some protocol names and aliases are listed in the /etc/protocols file. A null response
means that there are no numbers to report. The program report of the value specified for the Protocol variable is
unknown if there is no statistics routine for it.
-P
Shows the statistics of the Data Link Provider Interface (DLPI). The netstat -P command prints the following
statistic:
DLPI statistics:
Number of received packets = 0
Number of transmitted packets = 0
Number of received bytes = 0
Number of transmitted bytes = 0
Number of incoming pkts discard = 0
Number of outgoing pkts discard = 0
Number of times no buffers = 0
Number of successful binds = 0
Number of unknown message types = 0
Status of phys level promisc = 0
Status of sap level promisc = 0
Status of multi level promisc = 0
Number of enab_multi addresses = 0
If DLPI is not loaded, it displays:
can't find symbol: dl_stats
-r
Shows the routing tables. When used with the -s flag, the -r flag shows routing statistics. See "Routing Table
Display."
-s
Shows statistics for each protocol.
-ss
Displays all the non-zero protocol statistics and provides a concise display.
-u
Displays information about domain sockets.
-v
Shows statistics for CDLI-based communications adapters. This flag causes the netstat command to run the statistics
commands for the entstat, tokstat, and fddistat commands. No flags are issued to these device driver commands. See
the specific device driver statistics command to obtain descriptions of the statistical output.
-Zc
Clear network buffer cache statistics.
-Zi
Clear interface statistics.
-Zm
Clear network memory allocator statistics.
-Zs
Clear protocol statistics. To clear statistics for a specific protocol, use -p <protocol>. For example, to clear
TCP statistics, type netstat -Zs -p tcp.
Examples
1 To display routing table information for an Internet interface, type:
netstat -r -f inet
This produces the following output:
Routing tables
Destination Gateway Flags Refs Use PMTU If Exp Groups Netmasks:
(root node)
(0)0 ffff f000 0
(0)0 ffff f000 0
(0)0 8123 262f 0 0 0 0 0
(root node)
Route Tree for Protocol Family 2:
(root node)
default 129.35.38.47 UG 0 564 - tr0 -
loopback 127.0.0.1 UH 1 202 - lo0 -
129.35.32 129.35.41.172 U 4 30 - tr0 - +staff
129.35.32.117 129.35.41.172 UGHW 0 13 1492 tr0 30
192.100.61 192.100.61.11 U 1 195 - en0 -
(root node)
Route Tree for Protocol Family 6:
(root node)
(root node)
The -r -f inet flags indicate a request for routing table information for all configured Internet interfaces. The
network interfaces are listed in the Interface column; en designates a Standard Ethernet interface, while tr
specifies a Token-Ring interface. Gateway addresses are in dotted decimal format. Note: AIX 5.3 does not display
the PMTU column.
2 To display statistics for GRE Protocol, type:
netstat -s -p gre
This produces the following output:
GRE Interface gre0
10 number of times gre_input got called
8 number of times gre_output got called
0 packets received with protocol not supported
0 packets received with checksum on
0 packets received with routing present
0 packets received with key present
0 packets received with sequence number present
0 packets received with strict source route present
0 packets received with recursion control present
0 packets received where reserved0 non-zero
0 packets received where version non-zero
0 packets discarded
0 packets dropped due to network down
0 packets dropped due to protocol not supported
0 packets dropped due to error in ip output routine
0 packets got by NAT
0 packets got by NAT but not TCP packet
0 packets got by NAT but with IP options
3 To display interface information for an Internet interface, type:
netstat -i -f inet
This produces the following output if you are using AIX 4.2:
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
lo0 1536 <Link> 4 0 4 0 0
lo0 1536 127 loopback 4 0 4 0 0
en0 1500 <Link> 96 0 67 0 0
en0 1500 192.100.61 nullarbor 96 0 67 0 0
tr0 1500 <Link> 44802 0 11134 0 0
tr0 1500 129.35.32 stnullarb 44802 0 11134 0 0
This produces the following output if you are using AIX 4.3:
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
lo0 16896 Link#1 5161 0 5193 0 0
lo0 16896 127 localhost 5161 0 5193 0 0
lo0 16896 ::1 5161 0 5193 0 0
en1 1500 Link#2 8.0.38.22.8.34 221240 0 100284 0 0
en1 1500 129.183.64 infoserv.frec.bul 221240 0 100284 0 0
The -i -f inet flags indicate a request for the status of all configured Internet interfaces. The network
interfaces are listed in the Name column; lo designates a loopback interface, en designates a Standard Ethernet
interface, while tr specifies a Token-Ring interface.
4 To display statistics for each protocol, type:
netstat -s -f inet
This produces the following output:
ip:
:
44485 total packets received
0 bad header checksums
0 with size smaller than minimum
0 with data size < data length
0 with header length < data size
0 with data length < header length
0 with bad options
0 with incorrect version number
0 fragments received
0 fragments dropped (dup or out of space)
0 fragments dropped after timeout
0 packets reassembled ok
44485 packets for this host
0 packets for unknown/unsupported protocol
0 packets forwarded
0 packets not forwardable
0 redirects sent
1506 packets sent from this host
0 packets sent with fabricated ip header
0 output packets dropped due to no bufs, etc.
0 output packets discarded due to no route
0 output datagrams fragmented
0 fragments created
0 datagrams that can't be fragmented
0 IP Multicast packets dropped due to no receiver
0 successful path MTU discovery cycles
0 path MTU rediscovery cycles attempted
0 path MTU discovery no-response estimates
0 path MTU discovery response timeouts
0 path MTU discovery decreases detected
0 path MTU discovery packets sent
0 path MTU discovery memory allocation failures
0 ipintrq overflows
icmp:
0 calls to icmp_error
0 errors not generated 'cuz old message was icmp
Output histogram:
echo reply: 6
0 messages with bad code fields
0 messages < minimum length
0 bad checksums
0 messages with bad length
Input histogram:
echo: 19
6 message responses generated
igmp:defect
0 messages received
0 messages received with too few bytes
0 messages received with bad checksum
0 membership queries received
0 membership queries received with invalid field(s)
0 membership reports received
0 membership reports received with invalid field(s)
0 membership reports received for groups to which we belong
0 membership reports sent
tcp:
1393 packets sent
857 data packets (135315 bytes)
0 data packets (0 bytes) retransmitted
367 URG only packets
0 URG only packets
0 window probe packets
0 window update packets
170 control packets
1580 packets received
790 acks (for 135491 bytes)
60 duplicate acks
0 acks for unsent data
638 packets (2064 bytes) received in-sequence
0 completely duplicate packets (0 bytes)
0 packets with some dup. data (0 bytes duped)
117 out-of-order packets (0 bytes)
0 packets (0 bytes) of data after window
0 window probes
60 window update packets
0 packets received after close
0 discarded for bad checksums
0 discarded for bad header offset fields
0 connection request
58 connection requests
61 connection accepts
118 connections established (including accepts)
121 connections closed (including 0 drops)
0 embryonic connections dropped
845 segments updated rtt (of 847 attempts)
0 resends due to path MTU discovery
0 path MTU discovery terminations due to retransmits
0 retransmit timeouts
0 connections dropped by rexmit timeout
0 persist timeouts
0 keepalive timeouts
0 keepalive probes sent
0 connections dropped by keepalive
udp:
42886 datagrams received
:
0 incomplete headers
0 bad data length fields
0 bad checksums
0 dropped due to no socket
42860 broadcast/multicast datagrams dropped due to no
socket
0 socket buffer overflows
26 delivered
106 datagrams output
ip specifies the Internet Protocol; icmp specifies the Information Control Message Protocol; tcp specifies the
Transmission Control Protocol; udp specifies the User Datagram Protocol. Note: AIX 5.3 does not display the PMTU
statistics for the IP protocol.
5 To display device driver statistics, type:
netstat -v
The netstat -v command displays the statistics for each CDLI-based device driver that is up. To see sample output
for this command, see the tokstat command, the entstat command, or the fddistat command.
6 To display information regarding an interface for which multicast is enabled, and to see group membership, type:
netstat -a -I interface
For example, if an 802.3 interface was specified, the following output will be produced:
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
et0 1492 <Link> 0 0 2 0 0
et0 1492 9.4.37 hun-eth 0 0 2 0 0
224.0.0.1
02:60:8c:0a:02:e7
01:00:5e:00:00:01
If instead of -I interface the flag -i is given, then all configured interfaces will be listed. The network
interfaces are listed in the Name column; lo designates a loopback interface, et designates an IEEE 802.3
interface, tr designates a Token-Ring interface, while fi specifies an FDDI interface.
The address column has the following meaning. A symbolic name for each interface is shown. Below this symbolic
name, the group addresses of any multicast groups that have been joined on that interface are shown. Group address
224.0.0.1 is the special all-hosts-group to which all multicast interfaces belong. The MAC address of the interface
(in colon notation) follows the group addresses, plus a list of any other MAC level addresses that are enabled on
behalf of IP Multicast for the particular interface.
7 To display the packet counts in the communication subsystem, type:
netstat -D
The following output will be produced:
Source Ipkts Opkts Idrops Odrops
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
tok_dev0 720 542 0 0
ent_dev0 114 4 0 0
- - - - - - - - - - - - - - - - - - - - - - - - -
Devices Total 834 546 0 0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
tok_dd0 720 542 0 0
ent_dd0 114 4 0 0
- - - - - - - - - - - - - - - - - - - - - - - - -
Drivers Total 834 546 0 0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
tok_dmx0 720 N/A 0 N/A
ent_dmx0 114 N/A 0 N/A
- - - - - - - - - - - - - - - - - - - - - - - - -
Demuxer Total 834 N/A 0 N/A
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
IP 773 767 0 0
TCP 536 399 0 0
UDP 229 93 0 0
- - - - - - - - - - - - - - - - - - - - - - - - -
Protocols Total 1538 1259 0 0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
lo_if0 69 69 0 0
en_if0 22 8 0 0
tr_if0 704 543 0 1
- - - - - - - - - - - - - - - - - - - - - - - - -
Net IF Total 795 620 0 1
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
NFS/RPC Client 519 N/A 0 N/A
NFS/RPC Server 0 N/A 0 N/A
NFS Client 519 N/A 0 N/A
NFS Server 0 N/A 0 N/A
- - - - - - - - - - - - - - - - - - - - - - - - -
NFS/RPC Total N/A 519 0 0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(Note: N/A -> Not Applicable)
8 To display detailed data of active sockets, type:
netstat -aon
Output similar to the following is displayed:
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp4 0 0 *.13 *.* LISTEN
so_options: (ACCEPTCONN|REUSEADDR)
q0len:0 qlen:0 qlimit:1000 so_state: (PRIV)
timeo:0 uid:0
so_special: (LOCKBALE|MEMCOMPRESS|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:16384 lowat:4096 mbcnt:0 mbmax:65536
rcvbuf:
hiwat:16384 lowat:1 mbcnt:0 mbmax:65536
sb_flags: (SEL)
TCP:
mss:512
tcp 0 0 *.21 *.* LISTEN
so_options: (ACCEPTCONN|REUSEADDR)
q0len:0 qlen:0 qlimit:1000 so_state: (PRIV)
timeo:0 uid:0
so_special: (LOCKBALE|MEMCOMPRESS|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:16384 lowat:4096 mbcnt:0 mbmax:65536
rcvbuf:
hiwat:16384 lowat:1 mbcnt:0 mbmax:65536
sb_flags: (SEL)
TCP:
mss:512
...................
...................
9 To display the routing table, type the following:
netstat -rn
Output similar to the following is displayed:
Routing tables
Destination Gateway Flags Refs Use If PMTU Exp Groups
Route Tree for Protocol Family 2 (Internet):
default 9.3.149.65 UG 0 24 en0 - -
9.3.149.64 9.3.149.88 UHSb 0 0 en0 - - =>
9.3.149.64/27 9.3.149.88 U 1 0 en0 - -
9.3.149.88 127.0.0.1 UGHS 0 1 lo0 - -
9.3.149.95 9.3.149.88 UHSb 0 0 en0 - -
127/8 127.0.0.1 U 11 174 lo0 - -
Route Tree for Protocol Family 24 (Internet v6):
::1 ::1 UH 0 0 lo0 - -
Note: AIX 5.3 does not display the PMTU column.
The character => at the end of the line means the line is a duplicate route of the route on the next line.
The loopback route (9.3.149.88, 127.0.0.1) and the broadcast routes (with the flags field containing b indicating
broadcast) are automatically created when an interface is configured. Two broadcast routes are added: one to the
subnet address and one to the broadcast address of the subnet. The presence of the loopback routes and broadcast
routes improve performance.
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