tutorial - First step in hacking - know your neighboring machines

The simplest way I can do is use ping, I can send a broadcast packet to everyone in a subnet, so that they can response back. Let say I am in subnet of 192.168.0.x and the broadcast IP is 192.168.0.255, I can do this:

ping -b 192.168.0.255

How I know the broadcast IP is 192.168.0.255? I can check with ifconfig.

ifconfig eth0 | grep Bcast

Some routers are configured to filter broadcast and multicast packets to prevent broadcast storm, if so, broadcast is useless.

So what are the alternatives way?

I can ping the IP one by one with a line of bash script.

for ((i=1;i<255;i++));>

The result will look like this:

--- 192.168.0.1 ping statistics ---
--- 192.168.0.2 ping statistics ---
--- 192.168.0.3 ping statistics ---
--- 192.168.0.4 ping statistics ---
64 bytes from 192.168.0.5: icmp_seq=1 ttl=249 time=11.0 ms
--- 192.168.0.5 ping statistics ---
64 bytes from 192.168.0.6: icmp_seq=1 ttl=248 time=12.3 ms
--- 192.168.0.6 ping statistics ---
--- 192.168.0.7 ping statistics ---
--- 192.168.0.8 ping statistics ---
--- 192.168.0.9 ping statistics ---
--- 192.168.0.10 ping statistics ---
--- 192.168.0.11 ping statistics ---

Let me explain the ping options I use, -c (count) indicates how many attempt of ping for a single IP, -W specified the timeout in second, ping will waits until timeout to declare the attempt is fail.

From the sample results, I discovered 192.168.0.5 and 192.168.0.6.

Due to the limitation of ping, I can’t specified the timeout less than 1 seconds, to scan a class C LAN, it may takes up 255 seconds, which is extremely slow.



Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2008/02/13578175809338.html

Labels

Web Search Gmail Google Docs Mobile YouTube Google Maps Google Chrome User interface Tips iGoogle Social Google Reader Traffic Making Devices cpp programming Ads Image Search Google Calendar tips dan trik Google Video Google Translate web programming Picasa Web Albums Blogger Google News Google Earth Yahoo Android Google Talk Google Plus Greasemonkey Security software download info Firefox extensions Google Toolbar Software OneBox Google Apps Google Suggest SEO Traffic tips Book Search API Acquisitions InOut Visualization Web Design Method for Getting Ultimate Traffic Webmasters Google Desktop How to Blogging Music Nostalgia orkut Google Chrome OS Google Contacts Google Notebook SQL programming Google Local Make Money Windows Live GDrive Google Gears April Fools Day Google Analytics Google Co-op visual basic Knowledge java programming Google Checkout Google Instant Google Bookmarks Google Phone Google Trends Web History mp3 download Easter Egg Google Profiles Blog Search Google Buzz Google Services Site Map for Ur Site game download games trick Google Pack Spam cerita hidup Picasa Product's Marketing Universal Search FeedBurner Google Groups Month in review Twitter Traffic AJAX Search Google Dictionary Google Sites Google Update Page Creator Game Google Finance Google Goggles Google Music file download Annoyances Froogle Google Base Google Latitude Google Voice Google Wave Google Health Google Scholar PlusBox SearchMash teknologi unik video download windows Facebook Traffic Social Media Marketing Yahoo Pipes Google Play Google Promos Google TV SketchUp WEB Domain WWW World Wide Service chord Improve Adsence Earning jurnalistik sistem operasi AdWords Traffic App Designing Tips and Tricks WEB Hosting linux How to Get Hosting Linux Kernel WEB Errors Writing Content award business communication ubuntu unik