Script examples

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Revision as of 16:20, 8 October 2005 by 85.181.43.248 (Talk)
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Which IPs and hostnames are used for wireless clients?

Note: Only work if you get an IP from DHCP

 # mkdir -p /tmp/www
 while [ 1 ];
  do
  wl assoclist | awk '{print$2}' > /tmp/assocLIST
  # echo "<meta http-equiv="refresh" content="10"><b>Hostnames and IPs of WLAN clients</b> (last update: $(date))<p>"     > /tmp/www/wlan.html
  while read assocLINE
   do
     dumpleases | grep -i $assocLINE | awk '{print "Hostname: " $1, "MAC: " $2, "IP: " $3}'
   # echo "<br>";
        done < /tmp/assocLIST     # >> /tmp/www/wlan.html
  sleep 10;
done;

Output:

Hostname: tp MAC: 01:81:18:3d:49:5e IP: 192.168.2.101

You can change the order of "$1, $2, $3" or cut-out:

....awk '{print $1,$3}'

Output:

tp 192.168.2.101

if you want to show this in a browser remove the # and use: http://routerIP/user/wlan.html

To booting on startup see Startup Scripts

How can I protect this file? I want to allow showing this only if you are logged in the web interface! Please write it here, thanks


Keep ISP from disconnecting due to lack of traffic

Some Internet Service Providers will drop the connection if there is no traffic for some period of time (Idle Time-Out). With these script you can prevent this.

 while [ 1 ];
 do
 ping -c 5 www.example.com > /dev/null    # ping 5 packets
 sleep 300;                               # wait 5 minutes
 done;

If this does not work (providers ignores ICMP packets as traffic) use:

 while [ 1 ];
 do
 wget http://www.example.com/ -O /tmp/index -q   # download index file
 sleep 300;                                      # wait 5 minutes
 done;

How many connections are open for each IP?

This is handy for finding that person in your LAN whose P2P software opens many hundreds of connections, making the network slow for everybody.

sed -n 's%.* src=\(192.168.[0-9.]*\).*%\1%p' /proc/net/ip_conntrack | sort | uniq -c