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RE: security based on IP address
From: "patrick" <patrick () curioustechnology com>
Date: Mon, 1 Mar 2004 10:10:23 -0800

Hi Amit,

Basically you're asking about IP spoofing.  It's possible to craft IP
packets with a false source address.  Thus, you can circumvent "security"
controls if there are inclusive ACL and you craft packets with IP addresses
included in the ACL.



-----Original Message-----
From: Amit Sharma [mailto:amit.sharma () linuxwaves com] 
Sent: Sunday, February 29, 2004 12:03 AM
To: security-basics () securityfocus com
Subject: security based on IP address



Hi there,



My ISP provides internet access based on IP address. As in, he gives static
IP addresses to its customers and allows/disallow internet access based on
the same.





1. What am wondering at is, what if my ip address is blocked but I take over
somebody else's ip address and try to connect to the internet? Will the
ISP's proxy detect this?



This leads to the second question..

2. Can I take over the ip address of a system that is already up?





Gracias,

Amit

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---------------------------------------------------------------------------
Free 30-day trial: firewall with virus/spam protection, URL filtering, VPN,
wireless security

Protect your network against hackers, viruses, spam and other risks with Astaro
Security Linux, the comprehensive security solution that combines six
applications in one software solution for ease of use and lower total cost of
ownership.

Download your free trial at
http://www.securityfocus.com/sponsor/Astaro_security-basics_040301
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