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  #1  
Old 07-Apr-2008, 09:22 AM
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came back with some questions
hey i still work on my thesis and this time i determined mobile IPv6. I have some questions
other than these:

1- Perhaps this is a dumb one, though i wanna ask a question first you have never heard.
you know "the data encapsulation process". By doing this , can't we hide the information(data and control info)in packet from outer threats?

And so , why do we "also" use IPSec protocol to
hide the information if data encapsulation process already perform that?


2- There are two things: IPv4 Options and IPv6 Extension headers
IPv4 Options removed since it was infrequently used. Then it has been moved to extension headers.

Now let's come to question,
IPv4 Options would provide us some security, also IPv4 protocol field do this by adding
AH header and ESP header if IPSec is implemented.

So, wasn't "AH header and ESP header" enough to provide IPSec features? why also
use some information " in IPv4 Options? "

 
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  #2  
Old 07-Apr-2008, 10:03 AM
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duplicate of http://www.certforums.co.uk/forums/s...ad.php?t=24280

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  #3  
Old 07-Apr-2008, 10:06 AM
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Quote:
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Originally Posted by Fergal1982 View Post
”

i apologise but my message didn'T go at first time

 
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Old 07-Apr-2008, 10:14 AM
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Old 07-Apr-2008, 02:04 PM
hbroomhall hbroomhall is offline
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Quote:
“
Originally Posted by kobem View Post
hey i still work on my thesis and this time i determined mobile IPv6. I have some questions
other than these:

1- Perhaps this is a dumb one, though i wanna ask a question first you have never heard.
you know "the data encapsulation process". By doing this , can't we hide the information(data and control info)in packet from outer threats?
”
If data is encapsulated it can still be read, using something like Wireshark.
Quote:
“
Originally Posted by kobem View Post
And so , why do we "also" use IPSec protocol to
hide the information if data encapsulation process already perform that?
”
Because IPSec can *encrypt* the data. If you capture the packet you still can't read it. And IPSec also authenticates the source of the packet.

Quote:
“
Originally Posted by kobem View Post
2- There are two things: IPv4 Options and IPv6 Extension headers
IPv4 Options removed since it was infrequently used. Then it has been moved to extension headers.
”
I think you are confusing IPv4 Options with IPv4 Type of Service. It was TOS that was unused and re-engineered.
Quote:
“
Originally Posted by kobem View Post
Now let's come to question,
IPv4 Options would provide us some security,
”
IPv4 Options don't provide any security - why do you think they do?
Quote:
“
Originally Posted by kobem View Post
also IPv4 protocol field do this by adding
AH header and ESP header if IPSec is implemented.

So, wasn't "AH header and ESP header" enough to provide IPSec features? why also
use some information " in IPv4 Options? "
”
Options don't provide any encryption or authentication, which is why IPSec exists.

Harry.

 
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  #6  
Old 07-Apr-2008, 03:45 PM
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kobem kobem is offline
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got others hbroomhall

but for this, i say

************
Originally Posted by kobem View Post
Now let's come to question,
IPv4 Options would provide us some security,

”
IPv4 Options don't provide any security - why do you think they do?

*********
i have read somewhere that IPv4 options could be used to carry information related to encryption
so i told this.

 
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  #7  
Old 07-Apr-2008, 09:00 PM
hbroomhall hbroomhall is offline
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So the thing would be to dig out where this 'somewhere' was and review it!

Harry.

 
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