Hi you are right the implicit allow works incase if we are going from high security to low security. How ever if you have configured and access-list on the dmz to allow traffic to the inside interface then it takes precedence the implicit allow to outside will be denied. So what I suggest in these cases for dmz allow the traffic that you want to the inside interface, then block all the rest of the traffic to the inside and permit every thing else so the the internet traffic can move smoothly.
we have a 10.10.x.x. network on the inside and 172.16.x.x network on the dmz then I would do this.
access-list test permit ip 172.16.x.x 255.255.x.x host 10.10.x.x
access-list test deny ip any 10.10.0.0 255.255.0.0
access-list test permit ip any any
so the second last line denies all the traffic for inside except for the ones that we want. and the last line permits all the rest of the traffic to the internet.
Or you can also control the traffic to inside network via translation rules as well
The point of a DMZ is that connections from the internal and the external network to the DMZ are permitted, whereas connections from the DMZ are only permitted to the external network -- hosts in the DMZ may not connect to the internal network.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...