Grabbing IP (Seeking Experience)

Hi

I'm thinking of this question for a very long time already since i'm still a student, my exposure to corporate inter-network is still very little.

#1 Since the WAN Network carries all public ip addresses, how do IANA know who to assign the IP addresses to? I could just use one of the Live servers to obtain another company's IP address isn't it?

e.g.,
--- my company (202.132.128.100)
--- another company (218.211.29.38)

I can just steal his IP isn't it? and he'll just reiceve the conflicting ip error?

Please advise.

Alot of ISPs bind static IPs to the MAC address of the modem. SO if you put that IP on your computer it wont work.

It's as simple as this.....

You live at 123 High Street in Toledo for example.... While I live at 987 Main Street in Los Angeles.... When a letter addressed to me is mailed the Post Office, (think: routers), route the mail to my house. If you win a million dollars and pretend that you live at my address who do you think will get your million when they mail it to you? The Post Office won't change the routing simply because you lied..... ;)

A little reading that may help you.
Pay particular attention to terms like "broadcast domains" and their limitations.
http://computer.howstuffworks.com/ethernet.htm
http://www.yale.edu/pclt/COMM/TCPIP.HTM
http://computer.howstuffworks.com/router.htm

Google for "IP Spoofing" to learn of ways to try to trick IP devices.
It can sometimes turn into quite an involved process.

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Originally posted here by XTC46
Alot of ISPs bind static IPs to the MAC address of the modem. SO if you put that IP on your computer it wont work.

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Are you meaning dialup or DSL/CABLE?

For most dialup these days, IP allocation including statics are handled by the authentication
software (RADIUS) and the port controller.
The limiting factor is usually regional. But its getting better because many large ISP's use
common modem pools from providers like Level 3.
Here in Colorado Earthlink, AOL, MSN, and QWEST all share dialup equipment where
even the dialup numbers are from like provisions.

If you meant DSL or Cable ( you said modem so I was not sure) your statement make sense.

Im talking about dsl/cable

the use of the term of Modem is technicly correct regardless of wether your talking Dialup, adsl, sdsl, cable or ethernet.. they are ALL MOdulators-DEModulators

they are just interfaces for different mediums...

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Originally posted here by Und3ertak3r
the use of the term of Modem is technicly correct regardless of wether your talking Dialup, adsl, sdsl, cable or ethernet.. they are ALL MOdulators-DEModulators

they are just interfaces for different mediums...

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ummm okay..

What is your point?
Noone used the term wrong but it was important to draw the distinction based on the question
being asked as the answers could differ...

ss2chef - his point is that you stated you didnt know what type of modem he was talking about

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If you meant DSL or Cable ( you said modem so I was not sure) your statement make sense.

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And from the basis of what we were talking about anyway it was made apparent that we are talking about some form of ethernet and not dialup. Based on this

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Since the WAN Network carries all public ip addresses

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And if you have used dialup (which I am sure you have) and you have investigated and looked at your IP from the experience I have seen almost all of the time they just use DHCP and the it expires rather quickly. So you get a new IP everytime.

So to explain my rant his point was it didnt matter what term he used for modem... In general we are talking about broadband and not dialup.

But anyway, I am not attacking anyone just pointing out what an outsider sees/thinks. Back to the original question it is very dependent on the ISP as ss2chef had stated... How you are connected is semi relevant but I have seen it happen where you can spoof your mac address and then pull his IP causing a "Duplicate IP on the network" error and will kick him off the interent for a while.. Then when he resets his cable modem it will kick you. A buddy and I who went to college together use to play this game on Comcast's network for a while just to mess with eachother. All in all there is really no point to it and if he complains you may be violating some form of the User Agreement from your provider

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Originally posted here by Spyrus
ss2chef - his point is that you stated you didnt know what type of modem he was talking about
And from the basis of what we were talking about anyway it was made apparent that we are talking about some form of ethernet and not dialup. Based on this

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I follow what you are saying, and thank you for answering

But, a dial modem connected to the Internet IS connected to a WAN and can be
part of an "ethernet" network in cases like being used as an Internet sharing device...
A 3Com Office Connect comes to mind. Still in wide use in rural areas where broadband is not
available yet...

Thanks for the attempt at clarification tho...

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Originally posted here by Und3ertak3r
the use of the term of Modem is technicly correct regardless of wether your talking Dialup, adsl, sdsl, cable or ethernet.. they are ALL MOdulators-DEModulators

they are just interfaces for different mediums...

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Incorrect. Modulate means to make adubile, such as the fact that you can hear the audio of a modem when you pick up a telephone on the same line as the modem. Demodulate is to hear this sound and translate it back into data. Cable and Ethernet for sure don't do this, they operate solely on voltages. I'm not positive about DSL but I believe they're of the same manor.

Oh. Okay. I haven't read into WAN Technologies yet, does all the WAN equipments have a MAC Address too? (Sounds stupid yes?) Does the provider do handle/preventions on IP HiJackings?

Thanks all

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Oh. Okay. I haven't read into WAN Technologies yet, does all the WAN equipments have a MAC Address too

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AFAIK all networking hardware has a MAC address

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Incorrect. Modulate means to make adubile, such as the fact that you can hear the audio of a modem when you pick up a telephone on the same line as the modem. Demodulate is to hear this sound and translate it back into data. Cable and Ethernet for sure don't do this, they operate solely on voltages

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Whilst this is correct, we are talking about IP addresses within the Internet as far as I understand. So whilst it maybe, that a wlan can appy to an ethernet network, I think the OP was refering to Internet addressing. As such undertaker was talking about equipment that make a connection to the Internet, IE modulators/demodulaters. Whether it is dialup or through a router which has either an inbuilt or seperate modem.

And yes all telecommunications, with the exeption of fiberoptic, is modulated/demodulated.

AFAIK adsl is just away to carry digital data and voice over the same wire.