Script examples

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sed -n 's%.* src=\(192.168.[0-9.]*\).*%\1%p' /proc/net/ip_conntrack | sort | uniq -c sed -n 's%.* src=\(192.168.[0-9.]*\).*%\1%p' /proc/net/ip_conntrack | sort | uniq -c
</pre> </pre>
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 +'''You are here: ''' '''[[Main Page]]'''/'''[[DD-WRT Docu (EN)]]'''/'''[[Script Examples]]'''

Revision as of 19:56, 12 October 2005

Contents


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?

For each active IP on the local network (assumed to be a 192.168.x.0 network below), this prints out the number of connections that this IP has open to hosts on the Internet. "Connections" includes both TCP and UDP - while there are no "UDP connections", Linux maintains NAT-related information about UDP traffic which is similar to that for TCP.

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

You are here: Main Page/DD-WRT Docu (EN)/Script Examples