UCD IP Question

SirCretop

Does everyone on the LAN and wireless network in UCD have the same IP address? Say if two different people on two different laptops went to a site to check their ip....would it be the exact same??? or would the last 3 digits of the ip differ?

themole

They should be different, depending on whether or not you go through a proxy.

I for one have a unique IP address on the college LAN.

Chakar

Why do you want to know?

Stabshauptmann

Yes you will get caught

Riamfada

I have some on CD if your really stuck

SirCretop

dont we all go through a proxy on the lan??? you have a unique ip address yea? is that cause you have some sorta program or something that allows that or.............?

Blowfish

SirCretop wrote:

dont we all go through a proxy on the lan??? you have a unique ip address yea? is that cause you have some sorta program or something that allows that or.............?

We do indeed go through a proxy/proxies (well undergrads anyway). That is for web stuff only though, anything you do inside the UCD network (e.g. playing games accross it) you will have a unique IP for.

It is irrelevant whether or not you have a unique IP for the web anyway, as absolutely everything you do is logged by comp services.

/puts on tinfoil hat.

SirCretop

so if I went to a website and another person went to the same website on a different laptop....would the website recognise us as the same person basically????

Blowfish

SirCretop wrote:

so if I went to a website and another person went to the same website on a different laptop....would the website recognise us as the same person basically????

That would depend on how the website authenticates it's users (if at all). Quite a lot of them (like boards) have authentication based on cookies rather than IP, so can recognise individual users anyway.

You are right though in that there are some where it is done by IP only, and wouldn't be able to tell the difference between us. Actually i've had problems with that in the past in UCD with websites that only allow a certain number of concurrent users per IP. There was quite regularly other people in UCD using the same site, meaning I wasn't able to get access.

SirCretop

yea thats exactly the problem im having also bit of a disaster really!

Garret

is it something along the lines of rapidshare?

get an account they're worth it if UCD is your only broadband connection

SirCretop

yea spot on Garret! damn rapidshare

Red Alert

the UCD proxies all have unique IP's, and every machine does have a unique IP. some VLAN's can go direct to the net, the public wireless and wired can't.

fatal

If it helps,I have a premium rapidshare account and I use it in UCD all the time without a problem

SirCretop

if every machine has a unique IP then why do some sites think it's the same machine?? just cause the way they'resetup to identify viewers i take it???

Red Alert

Could be anything, but inside UCD unless you're staff you'll be proxied.

Now most proxies (like Squid which UCD uses) send the "Forwarded for" header with your own IP (which in ucd will be a real public one as opposed to a class C private one like 192.168.0.0 which you might use at home). A simple algorithm like tagging the forwarded-for and the proxy's IP will give a unique result, as would hashing the two some way.

Some sites might have been badly programmed and only take account of the originating IP.

Note also that IE and Firefox store user-specific profiles on the UCD computers so really what someone does before you is irrelevant.

SirCretop

hmmm...unless you're staff......so if I logged into a computer with a staff username and password I wouldn't be proxied??

Red Alert

you would be. Novell/Connect see staff/student based on where your context ie:

.exxbf083.eng.student.bf.ucd
vs
.mynamehere.eng.bf.ucd


however the network VLAN you are on determines what you can do. this is quite logical if you think about it - CS don't control the vast numbers of laptops like they would if it was a company. three VLAN's - public wireless, public wired, and private wired (sometimes called staff network). there's another VLAN that exists only inside admin, so that some very private information is harder to access.