RE: security based on IP address

["patrick" <patrick () curioustechnology com>]

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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