how are they able to detect my IP address?

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Plus, let's say that your IP address does change... unless a completely different DHCP server handles the request, you'll end up with an IP address on the same subnet as you got before... and the chances are VERY slim that two different people from the same small geographical area would access the site in such a short period of time.

In short, even without contacting your ISP, they'll probably figure out that it's the same person with two different IP addresses.

 

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hey i noticed something by looking at my modem content!

there is a local dhcp server built in my modem and changing IP 1 -hour interval!
(it is enabled)


i don't know i asked but have a curiosity

in my modem my start ip address is 192.168.1.2 (assigned by dhcp)

assigned by dhcp , ok this is my ethernet interface IP address for pc side
and as modem said lease time seems 1 hour and i can change it.


--but i can not control my public or WAN IP address and so that i can be caught
am i wrong ?

--I mean , private address will be changed but public one is still in the hands OF MY ISP?


---and last question ,think that my ethernet interface IP address for pc side seems 192.168.1.2 in my modem
but in pc control panel/network connections assume it is not 192.168.1.2

SO WILL there be a problem cause they are different private addresses?

 

Not sure what you are asking here Kobem.

However, there isn't a problem with connectivity as long as your client IP is in the same subnet range as your modems local interface IP.

The modem will be using NAT to communicate with the public external IP address as assigned by your ISP.

 

Your private address isn't displayed over the Internet... only your public address (on your modem) is. So even if you change the IP address on your PC, you'll still have the same public address on your modem.

You are correct that you cannot control your public IP address.

 

Weelllll....

(dons grey hat) that's not strictly true... (removes gray hat to reveal even greyer hair) ...but lets not go there

 

Let's not confuse matters, Z!

EDIT: If he asks, YOU get to explain it!

 

Detecting your public IP address, your operating system, and your web browser is a piece of cake. All you have to know is a little JavaScript:

http://www.getfreesofts.com/script/548/23426/Display_IP_address_script_using_SSI_and_JavaScript.html

 

APIPA uses the 169.254.0.0/16 scope.

 

Forget this one. Being to fast again. Sorry.

 

This could be different in different countries.

 

Like they said your ISP will have all the details of your connections and the IP address assigned at the time, a law enforcement agency with enough reason could put together a case if they wanted.

I'm not that up on the whole security topic but I guess theres probably a number of common ways around this :-

1. Connect using someone elses connection or computer, ie internet cafe, wi-fi bandwidth stealing etc.
(Possibly spoof your MAC address just to be extra safe.)
2. Tunnel over various protocols and machines in order to make the tracing process as difficult as possible.

If you're really interested theres loads of security resources about and the Security+ is a good start after the Network+.

I'd also bear in mind that cybercrime laws are now pretty punative in most countries and you would likely get treated worse than a common criminal should you break one of these laws...

 

all of you buried me in a certificate graveyard

 

huh what ?

 

you all mention "get a network+ , get a security+ " and i said "you buried me"

 

Getting Network + will help you alot, its not very expensive.

 

this is only true of a *cable* connection where you are really an extension of your providers LAN.

Your DSL provider will not see the hardware address of your equipment.

 

Sure they will, using PPPoE.

DSL providers will typically authenticate you by MAC address or by username/password (or both).

 

but the mac isn't seen at the isp - the cli, username and password is used for this.

 

It isn't seen using PPPoE?

 

Depends on the country. In the UK we don't use PPPoE normaly.

But your second sentence is correct. In the UK we auth via username and password.

Harry.