To do this right, you need to maintain a database of known
ip address/mac pairs. Here's a quick-and-dirty script
to poll a specific router for its arp table. [It seems
easier, to me, to set up one of these scripts for each router
than to parameterize this script.]:
#!/bin/sh
# turn control over to scotty -*- tcl -*- \
scotty2.1.5 "$0" "$@" | cut -d. -f13-; exit
package require Tnm 2.1
set s [snmp session -community _____________ -address _______]
$s walk x atTable {
set y [lindex $x 0]
set oid [lindex $y 0]
switch -glob $oid "1.3.6.1.2.1.3.1.1.2.*" {
set mac [lindex $y 2]
puts "$oid $mac"
} "1.3.6.1.2.1.3.1.1.3.*" { exit }
}
By running this periodically, you can aquire a reasonably
up-to-date list of active ip/mac pairs.
Depending on your application, you may need to normalize
the mac address format.
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