Question about IPs

[alexjohnson16]

I've been wondering this and decided this would be the place to ask...

On another Forum I read (its about highschool sports) a bunch of people from the same town have the same IP, and insist they are posting from their school library... This doesn't seem right to me as they all post on different computers...

I'm clueless when it comes to networking and IPs, would it use like a subnet mask for the whole network, thus all the same IPs???

 

[AFB]

Would it happen to begin with 192.168 or 10.0. or 172. ?

 

[alexjohnson16]

207.etc

 

[JackMDS]

Yeah, they all have the same Public IP, and are posting from few computers that are on a Network behind a Router.

What is a Router?

Link to: Basic Options for Internet Connection Sharing.

Link to: Hubs, routers, switches, DSL, LANs, WANs...?

 

[AFB]

Odd, Their ISP gives them private IPs?

 

[Sunner]

Originally posted by: amdfanboy
Odd, Their ISP gives them private IPs?

No, you just need one addy, put a firewall on that one, and run as many computers as you want behind the firewall, and let it do NAT'ing for them.
I have 8 computers at home all behind an OpenBSD firewall, and only the FW box has a public IP.

 

[AFB]

I really am confused. They're posting from a library. I thought they were on their home computers.

 

[HKSturboKID]

Originally posted by: amdfanboy
I really am confused. They're posting from a library. I thought they were on their home computers.

Well... I think these is how it works.

The students are at home dialing in or VPNing into the library for internet access and also research. So the Library act as an ISP assign them an IP address via the Library DHCP Server. When the students request a webpage, they will send the request to a gateway which is the library. The library then takes the request and uses its IP to request the info over the internet. So from outside, it only sees the Library IP address and never see any internal address which are dynamically assign by the library to the students.

 

[martind1]

Originally posted by: amdfanboy
I really am confused. They're posting from a library. I thought they were on their home computers.

come on, read the post. he says they are right in the library.


its the same as everyoen in one hosue being behind a router, with only 1 public address.


this is no big deal, so im not sure what the question was?