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#9669 - 02/17/04 02:33 PM port scanning
servo system Offline
Junior Member

Registered: 02/16/04
Posts: 10
Loc: us
hey how do i prevent someone from port scanning me is it poibol or not if so how do i do it?
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#9670 - 02/17/04 02:55 PM Re: port scanning
Ghost Offline


Registered: 06/16/03
Posts: 807
Loc: Wisconsin
Ok first of all, please read your post through once before posting because i can hardly get possible out of "poibol". Now onto your question, no there is not a way to stop people from port scanning you. If they are going to scan you, then they are going to scan you. The key is weather or not they will get results from the scan. If you block un nessecary open ports, then you would be able to significantly decrease the results they would find. You can close ports by using either a software or a hardware firewall. XP has a built in firewall which you could use to block most un nessecary open ports. If you want to find what ports you have open then go to Shields Up! or Dsl reports.com to have your ports probed. With that done you can close any un neccessary open ports. The whole point of this is to tell someone who scans you, that you do not exist. Hopefully then they will move on.
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#9671 - 03/25/04 07:55 PM Re: port scanning
horny hacker Offline
Junior Member

Registered: 03/25/04
Posts: 2
Loc: India
port scan?...so firstly, get a good Port Scanner, preferably stealth and then do a port scan on the target host. Now one thing that you must remember while doing a port scan is the fact that there are various so called 'stealth' port scanners around which claim to be undetectable, however most of them are detectable. So instead of using such' false claims' port scanners, I suggest you code one on your own.



But why do I need to use a stealth Port Scanner and how can I code my own Port Scanner? Well, the reason as to why you need a stealth port Scanner is that many system administrators log all port scans and records the IP and other information on such attempts, this makes you susceptible to getting caught. In my opinion the best Port Scanners around are those, which send SYN/FIN packets from a spoofed host, making logging useless. Such a port Scanner would be coded in C, but will not run in Windows. This was just an idea, now it is up to you to code it yourself.



Anyway, let me assume that you have got hold of a good 'impossible to detect' Port Scanner, now scan the target system for all open ports and record the open lists:



Note: In this manual, I have taken up my ISP as an example target system. It would be foo-barred throughout as xxx.bol.net.in



In my case, I found that the following ports were open:



Port Number Service



21 FTP

23 Telnet

25 SMTP

53 DNS
79 Finger

80 HTTP

110 POP

111 Not Useful

389 Not Useful

512 rlogin



Note: Only a few Port Scanners give you both the open Ports and the services running on them. Most Port Scanners only return the list of Open Ports. This is fine too; as once you get the list of open ports then you can find out the corresponding services running on them, referring to the RFC 1700. It contains the complete list of Port Numbers and the corresponding popularly running services.

Now port scanning takes advantage the 3-stage TCP handshake to determine what ports are open on the remote computer. To learn more about the TCP\IP protocol read the networking manuals that I distribute on my mailing list.

Tools like SATAN and lots of them more allow you to find out the list of open ports, the daemon or the service running at each open port and also the service's vulnerability at the click of a button. You can't call yourself a hacker if you need some Software, which first of all is not written by you to do something as lame as a port scan. Well yes I do agree that looking for open ports manually on a server would take a long time. But what I am suggesting is that you use a Port Scanning tool, which just gives you a list of open ports without the list of services and the vulnerabilities. I assure you, if you try and explore an open port of a remote server manually, you will be able to learn more about the remote system and also it will give you a taste of what hacking actually is. If you use a port scanner, which gives you all details at the click of a button to impress your friends, let me assure you none of them will be impressed, as I am sure anyone can use SATAN and other such scanners

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#9672 - 03/25/04 09:20 PM Re: port scanning
Gollum Offline
Member

Registered: 06/05/02
Posts: 207
Loc: US
hmmmm...servo: firewall. you can use zone alarm, agnitum outpost, norton, or the built in xp one.
hacker: answer the question next time. he was asking how to block a port scan, not how to do one.//
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Follow the direction no matter where it goes
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#9673 - 03/26/04 05:45 AM Re: port scanning
Gremelin Offline

Community Owner
*****

Registered: 02/28/02
Posts: 7192
Loc: Portland, OR; USA
built in XP one sucks, don't even bother with it until SP2 comes out.

Go Zone Alarm, their who I use, although my version is a little out of date as my subscription expired.
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#9674 - 03/26/04 07:29 AM Re: port scanning
jonconley Offline
UGN Super Poster

Registered: 10/08/02
Posts: 955
Loc: Merrill, IA, USA
XP does suck, but just for reminders, it is almost necessary to enable it when you have a fresh install of XP. I have forgotten to before, and been infected before I was able to finish downloading patches/security apps. It doesn't take long sometimes, especially with the new worms so often.

Be careful with software firewalls as well. There is a new worm that exploits firewall holes such as BlackICE I believe. Also, I am not very satisfied with the customization, features, and functionality of most software firewalls.

I would suggest (if you have broadband), to try using a router with a good firewall. Also, if you have a cheap box lying around, there are plenty of linux firewalls that can run on it probably. From a complete distro w/ firewall, to firewall only, to bootable firewall CD.

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#9675 - 03/26/04 07:39 AM Re: port scanning
Gremelin Offline

Community Owner
*****

Registered: 02/28/02
Posts: 7192
Loc: Portland, OR; USA
I'd use my router on my cable but comcast allows me to use as many ips as i want so I see no real reason, since there are software firewalls on all of my pc's heh.
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#9676 - 03/26/04 08:02 AM Re: port scanning
weeve Offline
UGN Super Poster

Registered: 10/29/02
Posts: 616
Loc: The Beach
yes xp sucks i'm cyrrently having sam corruption on a fresh install:|

see giz that's the difference between a suck east coast service, and west. their like vegas car dealer with i/t shit here..

yea..i know, "hence why you need to move back out weeve" ;p workin on getting the fuck out of fubar safely right now.

o servo system i say. IDS. Intrusion detection is key now a days. hell even my pda here has ids:x ;]
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#9677 - 03/26/04 01:00 PM Re: port scanning
Gremelin Offline

Community Owner
*****

Registered: 02/28/02
Posts: 7192
Loc: Portland, OR; USA
Wow, he has conversations with himself as me just like i do with him!
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#9678 - 04/29/04 10:41 AM Re: port scanning
New Kid Offline
Junior Member

Registered: 04/29/04
Posts: 4
Loc: San Marcos
My question is along the same lines, well its the opposite. How do I open a port, or is that what I need to do if my school has blocked me from accessing certain sites and programs like kazaa. I did netstat and saw that 1214 is closed and i know that is the kazaa port. What do I do??
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#9679 - 04/29/04 01:50 PM Re: port scanning
Gremelin Offline

Community Owner
*****

Registered: 02/28/02
Posts: 7192
Loc: Portland, OR; USA
You can't open a port; the ports are opened by a program (KaZaA is a program that use a port). Most likely they have their systems set to block all ports other than 80.
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#9680 - 04/30/04 04:30 AM Re: port scanning
New Kid Offline
Junior Member

Registered: 04/29/04
Posts: 4
Loc: San Marcos
Why can't I use port 80, because I have tried that. Sorry if I sound like an idiot, but I am new at this (hence the name). Also I used a program called Hopster that "tunneled" but it sucked, is this tunneling something to complicated to explain.
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