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ngagueu
Member since:
2002-04-14 19:59:37 |  posted: 2002-04-14 20:13:47
how the information is
routing in the secure
VPN?
----------
when AH(Authentication
Header)of IPSec is apply.
I suppose that the header
is encrypt. i want to
know How the intermediate
router in the Internet do
to route the information
to the
destination.
thanks
you!! | epoelke
Member since:
2002-04-17 22:47:59 | posted: 2002-04-17 23:46:28
AH
----------
AH does not actually
encrypt the contents of
the header. What it does
is create a MD5 or SHA1
crypto checksum based on
the contents of the
header. This allows the
remote host to verify
that nothing has been
changed in the header in
transit across the
internet. The problem
with AH is the wide
spread use of NAT, which
modifies the source or
destination address in
the IP header, and causes
the checksum to fail on
the remote side and the
packet in turn gets
discarded as a
"comprised" packet. |
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