What permits are required to allow IPSec using 8.4 ASA?

In my lab, I built a tunnel between two ASAs IPsec successfully.  There is a router in the middle to simulate the internet.

The tunnel only works when I have let echo ICMP message.

Allowing ICMP 3.4 does not appear to matter.

I did not allow for ESP or udp 4500 and udp 500 in the access list, only to echo ICMP message.  They are now allowed by default?

Which contradicts what I've read in textbooks.

Can someone tell me what are the allowances by default for v8.4 and above?  and what I leave in my ACL?

Thank you.

You are welcome.

You have to have a football game on the crypto ACL to trigger the tunnel, icmp, or whatever, but not necessarily the icmp traffic, example:

Cess-list allowed extended VPN ip 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0
or
list of access VPN extended permitted tcp 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0 eq 80
or
extended VPN access list allow icmp 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0

Basically all traffic matching would establish the tunnel.

If you still not clear, thanks for posting your ACL crypto for review.

Kind regards

Aref

Tags: Cisco Security

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