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#1 seakingtheonixpected

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Posted 07 December 2013 - 05:41 AM

So I've heard before that it isn't always a good idea to give your IP address to other people. However, I have a game program that allows for multiplayer if you know the other persons IP address.

 

So what is the worst thing that they can do with this information?



#2 Guest_ElatedOwl_*

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Posted 07 December 2013 - 12:16 PM

It's a bad idea to have your IP address known if your computer isn't secured. Someone malicious could run a port scan, find out what ports are open on your PC and potentially find vulnerabilities based on what they find.

 

It's most likely fine as long as you keep any software that deals with networking updated and the likelihood of finding someone that knows what to do with your IP address (and wants to do something malicious) is slim anyway.



#3 Kirihime Natsuno

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Posted 08 December 2013 - 01:44 AM

They can find out your home address... sometimes. It tends to not be a problem though. My IP address apparently places me in Hull >.> incorrect


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#4 Guest_ElatedOwl_*

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Posted 08 December 2013 - 12:13 PM

They can find out your home address... sometimes. It tends to not be a problem though. My IP address apparently places me in Hull >.> incorrect

It's not that exact. It's a general location that's (usually) near the actual location, but that depends on the ISP. 



#5 seakingtheonixpected

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Posted 08 December 2013 - 12:17 PM

Yeah I imagine it can probably find the server I'm connected too, which gives a general idea of where I live. But honestly even if they could get my address I don't really care. I doubt anyone is going to come all the way here too do anything.



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Posted 12 February 2014 - 05:03 AM

*cough* metasploit *cough*

 

Well more or less, they can fuck you up with only the ip.


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#7 Champion of Cyrodiil

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Posted 24 February 2014 - 10:17 AM

Depending on who is looking into your IP, a variety of things can happen.  Here are some facts that may help put an IP into perspective.

 

An IP address is an attribute for the TCP/IP protocol, thus is a software setting, not hardware.

 

Most people have a wired or wireless router in their home, so the public or externally facing IP address is usually bound to the router, while some kind of class C network is running inside their home. (Class C networks generally use the first two octets, 192.168)

 

The most commons types of IPs are Static or Dynamic.  Static IPs are usually defined on several network service by a network administrator (DNS, Firewalls, Routing Tables, and more).  Some might say that a network with static IPs is more secure.  Static IPs allow you to use system hosts files as a solid work around for DNS, as well as prevents the need for DHCP.  DNS servers can be exploited to find out what systems are on a network.  DHCP servers can as well.  Additionally DHCP and DNS servers can be hit with DoS attacks, preventing your users from being able to access network resources.

 

Dynamic IPs are usually maintained by a DHCP server.  Which will automatically issue an IP to a system when it is connected.  Newer Windows 7/8/2008R2 domain policies can allow you to configure DHCP with advanced security options, so that only a PC registered with the Active Directory domain can connect to the network.  This prevents someone from walking into your office building and plugging a home laptop into any open port, getting an IP address and start probing.

 

One analogy I like to use when explaining an IP versus Ports.  Is that one should think of your IP as your mailing address, and each port as a person at the residence.  You could have 3 people living in one house, that all share the same address.  Similarly, you can have 3 programs running on your computer, that are all sharing the same IP address.  Programs know which packet of data is theirs, based on the port that is used for delivery.  This is why having a basic firewall and the latest security patches are so crucial.  There are many ports that Windows, linux and Mac listen to regularly without your consent.  When hackers discover a technique to access your computer through some port or service, it's not always shared with the vendor and could leave you vulnerable for several days before a fix is available to download through updates.

 

It is also important to make sure you are running updated firmware within your router at home.  As I mentioned earlier, your public IP address is generally assigned to your router.  So if you use Netgear, Belkin, Linksys, etc.  You will want to make sure those devices are secure as well.

 

Once you go upstream from your house you start to leave the realm of software networking and would get more involved with hardware networking.  This is usally provided by an ISP and can range from Coaxial Copper Cabling, Fiber optic cabling, wireless radio (verizon? satellites), and more.  At this point we are talking about multiplexing, timing, circuits, relays, exchanges and even telephony.  Most of the technology started out being used for telephones. (http://en.wikipedia....branch_exchange)


These days, most of these systems are maintained through remote computer systems.  Generally they are secured and only available to employees of the company that provide your connection or "circuit".  Because of this, these companies generally have databases which contain your name, address, billing information and so on.  

So, when you are doing something illegal with your internet connection, realize that once your IP is logged.  With a warrant from a judge (depending on your country and laws), your information can be retrieved by a 3rd party with only your IP address.  In theory, a 'hacker' could also hack your ISPs data systems and steal your private information.  However, this is highly illegal and not even practical.  Your common anime fan with the screen name Hax0r4Lif3 won't be able to accomplish this.

 

Last, there are some services that provide 'public' information about IPs and security vulnerabilities.  The metasploit framework is a system that was developed to provide a way to perform 'penetration' testing.  That is, a way for you to attempt to hack your own systems.  http://en.wikipedia....asploit_Project  there are a few distributions of linux that take advantage of this framework to provide you with tools to do your own testing.  Backtrack 5 is an older linux distro that provided a lot of these tools.  Backtrack has since become more professional and is used by a lot of security folks as 'Kali LInux'. 
http://en.wikipedia.org/wiki/BackTrack

 

Another public service are the 'whois' lookup services that allow you to find out public information about a domain name or IP.  Personally I like the network solution's who is lookup. http://www.networkso...whois/index.jsp

 

If you want to know your 'public' IP, which could change regularly if your ISP is using DHCP rather than static, you can go to google and just type, 'what is my ip'.  then do a who is lookup and see what kind of information is available.  You will instantly see that there is a phone number and email for an administrator.  This is the person that can probably find out where you live pretty easily.  There is sometimes an Abuse number available as well, so that you can report spammers and hackers who are attempting to access your computer using their IP.

 

Not sure why i felt the need to go into this much detail, but it is what it is.  Also I typed a lot of this pretty quickly so I may have misspoke on some things.  Please feel free to correct me if it helps you sleep tonight.



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Posted 25 February 2014 - 03:35 AM

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#9 Champion of Cyrodiil

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Posted 25 February 2014 - 09:08 AM

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Posted 25 February 2014 - 05:38 PM

A simple answer would do, like: Even if someone had the ip, the worst things are dos or ddosing, metasploiting the ip, scanning for open ports and trying to find a way in but in general ips aren't that important, at least to me.

Well I guess there are probably some more ways but these are the common ones so...

 

The answer doesn't have to be that long @CoC.

 

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#11 The Robstar

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Posted 25 February 2014 - 10:54 PM

I don't see the big deal. My IP resets if the modem is restarted. :)


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#12 seakingtheonixpected

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Posted 26 February 2014 - 12:35 AM

I don't see the big deal. My IP resets if the modem is restarted. :)

true that.



#13 Champion of Cyrodiil

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Posted 26 February 2014 - 10:56 AM

A simple answer would do, like: Even if someone had the ip, the worst things are dos or ddosing, metasploiting the ip, scanning for open ports and trying to find a way in but in general ips aren't that important, at least to me.

Well I guess there are probably some more ways but these are the common ones so...

 

The answer doesn't have to be that long @CoC.

 

If someone asks a question like, "What can someone do with my IP."  That implies that they don't know about things such as metasploit, whois, using zenmap for port scanning, insecure.org, and all the other little scripts and programs out there people use; who don't know enough about networking and software engineering, to develop attacks themselves.

 

So while your short and incomplete answer covers whatever is important to you, it still leaves plenty of keywords for the reader to google and figure out for themselves. I simply tried to use analogies and go into a little bit more depth on the topic, since it is a forum and perhaps the person posting the question would like to get some real and intelligent feedback from someone.

 

I understand how all those words can be intimidating to have to read.  I was script kiddie in the late 90s myself, and didn't want to read lots of text to learn something new.  It's funner to dick around and break things or get in trouble with the school IT guy.



#14 Champion of Cyrodiil

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Posted 26 February 2014 - 11:00 AM

I don't see the big deal. My IP resets if the modem is restarted. :)

 

That is interesting.  My provider is comcast.  I usually have the same IP for an extended period of time, even if my modem is restarted.  However, it does seem to change eventually.  I would think that kind of behavior would indicate our IPs are issued with a DHCP server.



#15 The Robstar

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Posted 26 February 2014 - 05:19 PM

That is interesting.  My provider is comcast.  I usually have the same IP for an extended period of time, even if my modem is restarted.  However, it does seem to change eventually.  I would think that kind of behavior would indicate our IPs are issued with a DHCP server.

 

We're with Telecom. We've had the same Modem since 2006, she's pretty old now and prone to overheating. It usually resets if it's switched off for a long period of time. I noticed this when we had a powercut a couply years ago.


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#16 Kirihime Natsuno

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Posted 26 February 2014 - 05:23 PM

That is interesting.  My provider is comcast.  I usually have the same IP for an extended period of time, even if my modem is restarted.  However, it does seem to change eventually.  I would think that kind of behavior would indicate our IPs are issued with a DHCP server.

Mine does the same thing. Stays the same for some length of time, then changes to something totally different. Since my last post in this thread, my IP address has changed. Now instead of Hull, I'm apparently located in Reading. heh.


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#17 Champion of Cyrodiil

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Posted 26 February 2014 - 07:31 PM

We're with Telecom. We've had the same Modem since 2006, she's pretty old now and prone to overheating. It usually resets if it's switched off for a long period of time. I noticed this when we had a powercut a couply years ago.

I would definitely replace it. If i wasn't so lazy. I did a speed test, and I only get ~25Mbit/sec. I called the ISP (because I'm paying for 50 Mbit/sec.) and asked what was up with the bandwidth. They asked about my modem, i told them it was the same one I've been seeing around since 2006 (Motorola Surfboard). They were like, "Uhh, that is really old, you need a newer modem to achieve 50Mbit/sec." and offered to give me one if i swing by the comcast building. Needless to say, i'm still running 25/mbit like chump... oh well works for me. ;)

#18 Username *

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Posted 11 September 2014 - 07:54 AM

They can find out where you live, your OS, ISP and a few other things. It's really not that bad as long as you are using WPA2 and not WEP, because WEP is using a really bad stream cypher. Usually they don't really get your home address  because IPs are very inaccurate, for example if I live in Berlin, it will not usually tell you where in Berlin and Berlin is a big city.


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Posted 07 January 2015 - 07:13 AM

If someone asks a question like, "What can someone do with my IP."  That implies that they don't know about things such as metasploit, whois, using zenmap for port scanning, insecure.org, and all the other little scripts and programs out there people use; who don't know enough about networking and software engineering, to develop attacks themselves.

 

So while your short and incomplete answer covers whatever is important to you, it still leaves plenty of keywords for the reader to google and figure out for themselves. I simply tried to use analogies and go into a little bit more depth on the topic, since it is a forum and perhaps the person posting the question would like to get some real and intelligent feedback from someone.

 

I understand how all those words can be intimidating to have to read.  I was script kiddie in the late 90s myself, and didn't want to read lots of text to learn something new.  It's funner to dick around and break things or get in trouble with the school IT guy.

a bit of a late reply but you're right.

 

Your reply is pretty good. What I meant was that leaving keywords for the reader to research himself are sufficient enough to give him lots of information that he can find out by himself


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#20 imChristopher

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Posted 07 January 2015 - 07:45 PM

This is rather a interesting topic to touch, but nevertheless an IP address can easily be accessible throughout many variety of  ways. Even your phone number and telephone lines can be a dead giveaway if it's in a certain provider. IP addresses have been one of the most vulnerable things a hacker or a black hat might want. As said before in this topic of whom I forgot his username was, it's basically your location and where you live. If someone hated me for doing something wrong and really ticking off the wrong person to mess with, I wouldn't be surprised to wake up one morning with a pizza man at my front door saying I ordered 30 boxes of pizza to my address XD