HP-UX Reference (11i v2 07/12) - 1 User Commands N-Z (vol 2)

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netstat(1) netstat(1)
-p protocol Show statistics for the specified protocol. The following protocols are recognized:
tcp, sctp, udp, ip,
icmp, igmp, ipv6, and icmpv6.
-r Show the routing tables. When -v is used with the
-r option, netstat also
displays the network masks in the route entries. This option is ignored if the
-g,
-i, -I, -p or interval option is specified and is invalid if the
-s option is
specified.
-s Show statistics for all protocols. When this option is used with the
-M option,
netstat displays multicast routing statistics instead. This option is ignored if
the -g, -i, -I, -p
or interval option is specified and is invalid if the -r option is
specified.
-v Show additional information related to routing and sockets. When
-v is used
with the
-r option, netstat also displays the network masks in the route
entries. Since there can be multiple addresses involved in a SCTP socket endpoint,
netstat displays all local and remote addresses of a SCTP socket when the
-v
option is specified.
Note: SCTP is available only if the optional SCTP bundle is installed.
-w Show the output in wide format. This option displays all the fields in the output
with their maximum resolution in a single line. Thus, the output can be worked
upon with text-processing tools. This option works only with the
-i option and
will be ignored when used with any other option.
The system argument allows substitution for the default value
/stand/vmunix
. On PA-RISC systems
only, the core argument allows substitution for the default value
/dev/kmem.
If no options are specified, netstat displays the status of only active sockets. The display of active and
passive sockets status shows the local and remote addresses, send and receive queue sizes (in bytes), proto-
col, and the internal state of the protocol.
Note: The send and receive queue size displayed is usually zero. These fields are displayed only for back-
ward compatibility purposes.
Address formats are in two forms: host.port, or network.port if the host portion of a socket address is
zero. When known, the host and network addresses are displayed symbolically by using gethost-
byname()
and getnetbyname(), respectively (see gethostent(3N) and getnetent(3N)) for IPv4, and
getnameinfo() for IPv6 (see getaddrinfo(3N)). If a symbolic name for an address is unknown, the
address is displayed numerically according to the address family. For more information regarding the
Internet ‘‘dot format’’ for IPv4 addresses, refer to inet(3N). For more information regarding the Internet
‘‘colon format’’ for IPv6 addresses, refer to inet6(3N). Unspecified or ‘‘wildcard’’ addresses and ports appear
as an asterisk (
*).
The interface display provides a table of cumulative statistics regarding packets transferred, both inbound
and outbound. The network addresses of the interface and the maximum transmission unit (MTU) are
also displayed. When the interval argument is specified, netstat displays a running count of statistics
related to network interfaces. This display consists of a column for the first interface found during auto-
configuration and a column summarizing information for all interfaces. To display a running count of
statistics for a specific interface, use the -I option. The first line of each screen of information contains a
summary since the system was last rebooted. Subsequent lines of output show values accumulated over
the preceding interval.
The routing table display indicates the available routes and their status. Each route consists of a destina-
tion host or network, a netmask and a gateway to use in forwarding packets. The Flags field shows
whether the route is up (U), whether the route is to a gateway (G), or whether the route is a host or net-
work route (with or without H).
The Netmask field shows the mask to be applied to the destination IP address of an IP packet to be for-
warded. The result will be compared with the destination address in the route entry. If they are the same,
then the route is one of the candidates for routing this IP packet. If there are several candidate routes,
then the route with the longest Netmask field (contiguous 1’s starting from the left-most bit position) will
be chosen. (see routing(7).)
The Gateway field shows the address of the immediate gateway for reaching the destination. It can be
the address of the outgoing interface if the destination is on a directly connected network.
34 Hewlett-Packard Company − 2 − HP-UX 11i Version 2: December 2007 Update