09-28-2011
Neighbors don't exactly advertise themselves.
On a local network, you can use tons of ARP who-has packets to scan the entire subnet range. Anything with an IP answers to ARP.
On a WAN you're stuck with ping, and things don't have to answer that.
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LEARN ABOUT DEBIAN
essidscan
ESSIDSCAN(8) Commands ESSIDSCAN(8)
NAME
essidscan - scan for ESSID corresponding to available WLAN access points
SYNOPSIS
In /etc/network/interfaces:
mapping <interface> script essidscan
DESCRIPTION
The essidscan utility is used to tell the ifup and ifdown utilities about the current SSID of the WLAN currently being accessed. It can be
used to map the SSID name to an iface stanza.
CONFIGURATION
A sample /etc/network/interfaces may look like this:
mapping hotplug
script /etc/network/essidscan
map SSIDONE wlan-work
map SSIDTWO wlan-work
map HOME
iface wlan-work inet dhcp
wireless-key 1234-5678-9ABC-DEF0-1234-5678-9A
wireless-keymode restricted
iface HOME inet static
address 192.168.2.4
netmask 255.255.255.0
gateway 192.168.2.1
wireless-essid HOME
wireless-key s:somepassword
wireless-keymode open
iface DEFAULT inet dhcp
FILES
/etc/network/interfaces
the interfaces definition file
/etc/network/run/ifstate
a record of the current state of the interfaces, managed by ifup and ifdown
SEE ALSO
interfaces(5) ifscheme(8) ifup(8) ifdown(8)
AUTHORS
Tor Slettnes <tor@slett.net>
ESSIDSCAN(8)