05-21-2004 05:57 AM
Hiya
Can anyone explain to me what NAT traversal is and how it impacts VPN s?
05-24-2004 12:26 AM
NAT traversal is UDP encapsulation of IPSec ESP packets used for IPSec passing trhough NATing routers.
It uses UDP ports 500 and 4500.
See http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/v_63/cmdref/gl.htm#wp1027312
and
http://www.ietf.org/internet-drafts/draft-ietf-ipsec-udp-encaps-09.txt
for deep details.
Regards,
Milan
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