Technical data

netstat

Displays network-related data in various formats.

Format

netstat [-rn] | [-an] [-f address_family][interval]

netstat [-abd"H"im"M"nrstv] [-f address_family][interval]

netstat [-ntdz] ["-I" interface][interval]

netstat [-i] [-p protocol]

Description

The interval argument speciﬁes in seconds the interval for updating and

displaying information. The ﬁrst line of the display shows cumulative statistics;

subsequent lines show statistics recorded during interval.

Default display

When used without ﬂags, 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 provides a table of cumulative statistics for the

following:

• Interface name (Name)

• Maximum transmission unit (Mtu)

• Network address

• Packets received (Ipkts)

• Packets received in error (Ierrs)

• Packets transferred (Opkts)

• Outgoing packets in error (Oerrs)

• Collisions (Coll)

Note that the collisions item has different meanings for different network

interfaces.

• Drops (optional with

-d

)

A–18 Troubleshooting Utilities Reference