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how to get a list of the connected wifi clients in OpenWrt 10.03?

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up vote 6 down vote accepted

You may use the arp-table, or DHCP-leases. Not a perfect solution, maybe it's enough?

List arp-table

arp

List DHCP-leases

cat /tmp/dhcp.leases

... and combined

for ip in $(arp | grep -v IP | awk '{print $1}'); do 
    grep $ip /tmp/dhcp.leases; 
done
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You have recent leases too, like a powered off laptop and a phone currently on another wifi network. – Dereckson Aug 4 '14 at 17:54

How about nmap?

opkg install nmap

Then do a stealth scan of your subnet (likely 192.168.1.0/24)

nmap -sS 192.168.1.0/24

This will list services running on the clients as well. It may also set off alarms if the client has port-scan detecting software (i.e snort) installed so be careful.

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In order to see associated wifi clients, even if they don't have a DHCP Client or have no ip, you have to ask the AP for associated wifi devices:

# Universal (Tested with OpenWRT 14.07 and 15.05.X)
iwinfo wlan0/wl0/ath0 assoclist

# Proprietary Broadcom (wl)
wl -i wl0 assoclist

# Proprietary Atheros (madwifi)
wlanconfig ath0 list sta

# MAC80211
iw dev wlan0 station dump

This way you will also see the connection speed. For me this is looking like this:

# iwinfo wlan0 assoclist
12:34:56:78:9A:BC  -26 dBm / -95 dBm (SNR 69)  1930 ms ago
RX: 24.0 MBit/s, MCS 0, 20MHz                   3359 Pkts.
TX: 130.0 MBit/s, MCS 14, 20MHz, short GI       1209 Pkts.
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