HP-UX Reference (11i v1 00/12) - 1 User Commands N-Z (vol 2)

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netstat(1) netstat(1)

-v Show additional routing information. When -v is used with the -r option,

netstat also displays the network masks in the route entries. This option only

applies to the -r option.

The arguments system and core allow substitutes for the defaults, /stand/vmunix and /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. 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 gethostbyname() and getnetbyname(), respectively (see gethostent(3N)

and getnetent(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’’, refer to

inet(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 leftmost 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.

The Interface ﬁeld identiﬁes which network interface is used for the route.

The Pmtu ﬁeld displays the path maximum transmission unit (PMTU). If the route is created with a static

PMTU value (see route(1M)), the corresponding PMTU value permanently overrides the interface MTU.

Otherwise, the Pmtu value is the same as the MTU of the network interface used for the route.

DEPENDENCIES

X.25:

-a option does not list X.25 programmatic access information.

AUTHOR

netstat was developed by HP and the University of California, Berkeley.