Linux in a Nutshell, Fifth Edition

tset | 485

Linux

Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

-i interface

Specify the network interface for getting the source IP address

for outgoing probe packets. Useful with a multi-homed host.

Also see the -s option.

-I Use ICMP ECHO requests instead of UDP datagrams.

-m max_ttl

Set maximum time-to-live used in outgoing probe packets to

max-ttl hops. Default is 30.

-n Show numerical addresses; do not look up hostnames. (Useful

if DNS is not functioning properly.)

-p port

Set base UDP port number used for probe packets to port.

Default is (decimal) 33434.

-q n

Set number of probe packets for each time-to-live setting to

the value n. Default is 3.

-r Bypass normal routing tables and send directly to a host on an

attached network.

-s src_addr

Use src_addr as the IP address that will serve as the source

address in outgoing probe packets.

-t tos

Set the type-of-service in probe packets to tos (default 0). The

value must be a decimal integer in the range 0 to 255.

-v Verbose; received ICMP packets (other than TIME_

EXCEEDED and PORT_UNREACHABLE) will be listed.

-w wait

Set time to wait for a response to an outgoing probe packet to

wait seconds (default is 5).

-x Toggle IP checksums, usually to turn them off. IP checksums

are always calculated if -I is specified.

-z msecs

Set the delay between probes, in milliseconds. The default is 0.

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