How can I make the following more secure?:
access-list from_outside permit esp any any
We have currently have it on our firewall and I know it's not the most secure. But I want to make sure our tunnels still work.
This line I assume you have it applied on the outside interface. If that is the case, this line should be used to allow traffic from outside to the inside. If you have static nat configured you could permit esp from know sources to the NAT'ed IPs.
If you don't have any nat for inbound traffic then you don't need that acl.
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