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connecting my laptop to school network
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leguaan
Tux's lil' helper
Tux's lil' helper


Joined: 04 Feb 2005
Posts: 107
Location: Slovakia

PostPosted: Fri Apr 08, 2005 10:52 am    Post subject: connecting my laptop to school network Reply with quote

hello,
this may sound like I want help with illegaly breaking into some network...
all I want to do, is to connect my laptop to school network and download some things.
It's legal, people do it, but there is nobody who could help me with it.
There are these strange sockets in the walls everywhere, to connect via ethernet cable.
What information do I need to find out? I look at the configuration stuff under Linux,
and it wants a bunch of xxx.xxx.xxx.x (IP-looking) things like netmask etc...
Do I really need these? Do I have to speak to the network administrator, or
can I figure them out myself somehow?
Are there some documents in the internet I could read to help me?
Thanks,
L
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tuxmin
l33t
l33t


Joined: 24 Apr 2004
Posts: 838
Location: Heidelberg

PostPosted: Fri Apr 08, 2005 11:00 am    Post subject: Reply with quote

It would be wise to talk to your admin first. He will provide you with all necessary data.
Anything else could be interpreted as an offense...


Regards, Alex!!!
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leguaan
Tux's lil' helper
Tux's lil' helper


Joined: 04 Feb 2005
Posts: 107
Location: Slovakia

PostPosted: Fri Apr 08, 2005 12:43 pm    Post subject: Reply with quote

ok, as soon as I figure out who actually is the admin :)
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Since he could no longer be of any use to me,I left him there on the stones without much regret and whistled down a few vultures which settled down on him in order to guard him. (Kafka)
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nielchiano
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Joined: 11 Nov 2003
Posts: 1287
Location: 50N 3E

PostPosted: Fri Apr 08, 2005 1:16 pm    Post subject: Reply with quote

simple:
put your laptop on the net
start to generate A HELL OF A LOT OF TRAFFIC (using pktgen, for example)
Wait at your laptop.
The guy that comes in and punches you in the face is probabely the admin...

edit: DO NOT TRY THIS
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MrUlterior
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Joined: 22 Mar 2005
Posts: 511
Location: Switzerland

PostPosted: Fri Apr 08, 2005 2:40 pm    Post subject: Reply with quote

Plug in to one of the RJ45s & run:
Code:

ifconfig eth0 up
dhclient eth0
ifconfig eth0

If the 2nd command doesnt time out, the 3rd should show you an IP address -- this is assuming the network has dhcp setup and is not bound to MAC addresses of known hosts.

If this doesn't work, fire up ethereal or tcpdump and note down some of the addresses you see on TCP packets floating by - from these you should be able to work out an address range/netmask and attempt to hijack a free one. Experiment till you have a working configuration or someone stops you, whichever comes first.

This all said, Im pretty sure you could find the network admin by *asking* ...
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ai
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Joined: 21 Mar 2004
Posts: 227
Location: Poland, Krk

PostPosted: Fri Apr 08, 2005 3:50 pm    Post subject: Reply with quote

if there's no dhcp then you have to know 2 things: the ip you can use (e.g. in a local network 192.168.xxx.xxx) and the netmask and broadcast (acctually u are able to guess it knowing the first two ones).
Just ask or use ethereal or tcpdump as said above and then #ifconfig ethX <ip adress u can use> netmask < [; > broadcast < ;] >.
And after that it should work fine ;]

it is really no big deal at all :)
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