peer cvpn through pix and ending the pix

cvpn-= pix = - internet-= point of termination vpn (pix) =

Can someone point me to a document or explanation on why ipsec must be open on the first pix to IPSEC to cross because he hails from this network? I can't find a document that explains better that I can or includes the above scenario for the layman.

The PIX opens only the holes for the return for TCP and UDP based traffic. IPSec ESP is located just above IP and is therefore not based TCP/UDP. For this reason, you must specifically allow Protocol IP 50 (ESP) in the PIX from the outside, because as I said, the PIX will not open a hole to get him back.

He done the same for the ICMP protocol, it takes of icmp in the PIX, if you want your interior to the users to be able to ping outside guests. Because ICMP is not based of TCP/UDP, the PIX does not open a hole for the return to return to traffic.

Now, that said everything that, in point 6.3, they added a '' correction '' ESP, so the PIX could inspect the outbound ESP for A a SINGLE TUNNEL, he PAT to the address of the external interface and allow the return of traffic to. It is disabled by default, you can activate it with the following text:

fixup protocol esp-ike

You can read about it here:

http://www.Cisco.com/univercd/CC/TD/doc/product/iaabu/PIX/pix_sw/v_63/cmdref/DF.htm#wp1067379

Tags: Cisco Security

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