Ping Sweeps to test for packet loss on both router and host ends.

[bruce.porter]

Does anyone know of a simple DOS batch mode or Linux script to ping a specified set of subnets with large numbers of pings? Purpose is to look for link problems not normally detected on the network-side equipment.

[umedryk]

The following example will ping the ip address and will send 10 packets. Like wise specify the ip addresses that needs to be pinged

Router1#tclsh

Router1(tcl)#foreach i {

10.10.10.6

} { ping $i repeat 10 }

[bruce.porter]

Very interesting. I take it the clsh command puts you in the tool control language. I am not familiar with tcl. Can you elaborate on how you would select, say a range of ip subnets of 10.0.1.0, and 10.0.5.0? Also 10.0.10.0 through 10.0.20.0. thx

[Joe Clarke · Accepted solution]

Something like this would work. This script will ping every address from .1 to .254 on each of the specified subnets. It will send one ping packet to each host:

## BEGIN script

proc pingSweep { } {

set subnet "10.0"

set octets [list 1 2 3 4 5 10 11 12 13 14 15 16 17 18 19 20]

for { set i 0 } { $i < [llength $octets] } { incr i } {

for { set j 1 } { $j < 255 } { incr j } {

set addr "${subnet}.[lindex $octets $i].${j}"

ping $addr repeat 1

}

}

}

pingSweep

## END script

Router#tclsh flash:pingSweep.tcl

This assumes you save this script into the router's flash as pingSweep.tcl. You could also type all of this in once you enter tclsh in IOS.

[bruce.porter]

Worked as advertised. thx