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.TH PING 8

.SH NAME

ping, gping, traceroute, hogports \- probe the Internet

.SH SYNOPSIS

.B ip/ping

[

.B -6aflqr

] [

.B -i

.I interval

] [

.B -n

.I count

] [

.B -s

.I size

] [

.B -w

.I waittime

]

.I destination

.PP

.B ip/gping

[

.B -r

] [

.B -l

] [

.B -i

.I interval

]

.I destination

[

.I destination

\&... ]

.PP

.B ip/traceroute

[

.B -dn

][

.B -a

.I n

][

.B -h

.I nbuck

][

.B -t

.I sttl

]

.I dest

.PP

.B ip/hogports

.B [\fImtpt\fP/]\fIproto\fP!\fIaddress\fP!\fIstartport\fP[-\fIendport\fP]

.SH DESCRIPTION

.I Ping

sends ICMP echo request messages to a system.

It can be used to determine the network delay

and whether or not the destination is up.

By default, a line is written to standard output for

each request.

If a reply is received the line contains the request

id (starting at 0 and incrementing), the round trip time

for this request, the average round trip time, and the time

to live in the reply packet.  If no reply is received the line

contains the word "lost", the request id, and the average round

trip time.

.PP

If a reply is received for each request,

.I ping

returns successfully. Otherwise it returns an error status of

"lost messages".

.PP

The options are:

.TP

.B 6

force the use of IPv6's ICMP,

.BR icmpv6 ,

instead of IPv4's ICMP.

.I Ping

tries to determine which version of IP to use automatically.

.TP

.B a

adds the IP source and destination addresses to each report.

.TP

.B f

send messages as fast as possible (flood).

.TP

.B i

sets the time between messages

to be

.I interval

milliseconds, default 1000 ms.

.TP

.B l

causes only lost messages to be reported.

.TP

.B n

requests that a total of

.I count

messages be sent, default 32.

.TP

.B q

suppresses any output (i.e. be quiet).

.TP

.B r

randomizes the delay with a minimum extra delay of 0 ms and a

maximum extra delay of the selected interval.

.TP

.B s

sets the length of the message to be

.I size

bytes, ICMP header included.

The size cannot be smaller than 32 or

larger than 8192.  The default is 64.

.TP

.B w

sets the additional time in milliseconds to wait

after all packets are sent.

.PP

.I Gping

is a

.I ping

with a graphical display.  It

presents separate graphs for each destination

specified.

.PP

The options are:

.TP

.B r

display round trip time in seconds.

This is the default.

.TP

.B l

display percentage of lost messages.

A message is considered lost if not

replied to in 10 seconds.  The percentage

is an exponentially weighted average.

.TP

.B i

sets the time between messages

to be

.I interval

milliseconds, default 5000 ms.

.PP

Graphs can be dropped and added using

the button 3 menu.  Clicking button 1

on a datapoint displays the value of the

datapoint and the time it was recorded.

.PP

.I Traceroute

displays the IP addresses and average round trip times to all

routers between the machine it is run on and

.IR dest .

It does this by sending packets to

.I dest

with increasing times to live (TTL) in their headers.

Each router that a packet expires at replies with an ICMP

warning message.

The options are:

.TP

.B d

print debugging to standard error

.TP

.B n

just print out IP numbers, don't try to

look up the names of the routers.

.TP

.B a

make

.I n

attempts at each TTL value (default 3).

.TP

.B t

set the starting TTL value to

.I sttl

(default 1).

.TP

.B h

print out a histogram of times from request

to response at each TTL value.  The histogram

contains

.I nbuck

buckets.

.PD

.PP

.I Hogports

announces on a range of ports to keep them from other processes.

For example, to keep anyone from making a vncserver visible on

the network mounted at

.BR /net.alt :

.EX

	ip/hogports /net.alt/tcp!*!5900-5950

.EE

.SH SOURCE

.B /sys/src/cmd/ip/ping.c

.br

.B /sys/src/cmd/ip/gping.c

.br

.B /sys/src/cmd/ip/traceroute.c

.br

.B /sys/src/cmd/ip/hogports.c

.SH SEE ALSO

.IR ip (3)