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Linux - Networking This forum is for any issue related to networks or networking.
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Old 07-15-2007, 05:11 PM   #1
Registered: Aug 2006
Location: Allahabad,India
Distribution: Fedora Core 5
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how can a host outside a private network know the actual sender's ip ??

hi everyone,
we have a private class B network 172.31 subnetted. To connect to the internet we use some proxy servers connected to a router n then to the Internet.
I am a networking newbie and earlier i thought when a http request is sent using a proxy , the packet might be sent from the other i-face of the router i.e connected to Internet which has some ip other than 172.31 , but when i was browsing i found that it was displaying my private ip address n obviously that one of the router's..

how can they manage to know about a host on a private network??
unaware of much about PHP n web designing,firstly i thought they might be using some applet kind of thing in their HTML source code n know the private ip by running appropriate prog. on the client side.. but even that wasn't true.. here is a segment of the html source of that web page
 <TD class="fontgraysmall" width="65%">
 <span id="Livedemo1_lblIpAddress"
which is simple html n nothing else.. could someone plzz clarify how do they manage to do this??

thanx in advance...

Last edited by rs_vijay; 07-15-2007 at 05:18 PM.
Old 07-15-2007, 05:17 PM   #2
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Registered: Aug 2001
Location: Fargo, ND
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If they displayed your IP address, then they probably are running a java script program in your browser which displays your IP address.

Last edited by jschiwal; 07-15-2007 at 05:19 PM.
Old 07-15-2007, 08:31 PM   #3
Registered: Apr 2004
Distribution: redhat 9.0, fc4, redhat as 4
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this is due to squid configuration. you can block it throught squid. currently i am using windows xp, when i boot linux, i will send you config tag.


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