1). get cable [modems] mac-addreaayou can either look at the back of the modem to get this mac address or you can logon to your cable modem with yourwebbrowser192.168.100.1/ . this is internal html pages stored within your docsis cable modem (sb5100, sb4100 and sb3100) that gives you even more vital information on configuration. unless it is turned off by your isp. this feature might be totally turned off by your isp.
2). get your [isp] tftp server ip addressa) theres a programcalled query.exe from weird solutions which is a bootp packetrequestprogram that will tell you everything you need to know, without all these extra steps. it will display the image filename, tftp server address, which is really all you need to get started. to use this bootp query tool, you need the mac address of your cable modem or beginners can use docsis diagnosis utilitycode::docsisusing the above tools you will get the information of your isps tftp server ip and the name of your "image file" stored in thattftp serverall your vital information is stored in this file, one of which is the maxratedown 2621440 maxrateup 393216. (this was my isp settings. which you can see is similar to what speed i was getting. 40kb/s up and 250 kb/s down)among these, the one we need are:configuration [tftp] [server] = 194.*.*..90 (replace this with yours throughout in the doc)configuration filename = isrr.bin (replace this with yours throughout in the doc)andip fragments created = 0ip address.10.$$$.$$$.$$$ = 10.$$$.$$$.$$$ip address.192.168.100.1 = 192.168.100.1 (the ip address of the cable modem, (replace this with yours throughout in the doc)ip-to-if-index.10.$$$.$$$.$$$ = 2suggestion: you can do this step by sniffing the modem i.e. "192.168.100.1" when modem boots up. i never tried this method. try your luck.
3) download image file from isps tftp server.fordoing this got to your command prompt and use below commands with out quotes and bracket."c:tftp -i get "okay now you got image file from your isps tftp server.
4). decrypt the image file which you downloaded from isps tftp serverfor all you can use the docsis toolcode::docsisto decode
5). modify the image filechange your computers tcp configuration same as isps tftp server (i.e. ip address same as isps tftp server)go to my network place and right click -propertiesselect your lan card right click -property-internet protocol (tcp-ip) double click on it and change it to as following valuesconfigure your tpcs tcp settings as belowip: 194.*.*.90 (replace with the isps tftp server)netmask: 255.255.255.0gateway: 192.168.100.1 (replace with your cable modems ip address)note: gateway should be 192.168.100.1 then only your modem can communicate with computer.
6). encrypt the modified image file (save it using docsis)
7). host tftp server in your computerdownload tftp server software and host tftp server in your computeryou can download tftp server from: code:code::click here
8). put image file in the base directory of your tftpstart tftpd32 server. go to settings and set the security to none. increase the timeout to 20secs and the max retransmit to 6. choose to translate unix filenames. make sure its base directory point to where the isrr.bin is (i.e. the image file which you modified). if you need to replicate a directory pathname along with the image file, then make a directory from root that corresponds to the image file pathname.restart your modem, and as soon as the send light goes solid, you should see a receive on your tftp server i.e. your pc
9). [restart] your [modem]
10). changer your pcs ip back as given by isp
11). oops done. start surfing with your new speed
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