Hi, I have set up my firewall but some confusion in my mind going on. I have configured DMZ and Inside zone and both range are different and inside security level is by default 100 and DMZ is 50 but as per the default rule the higher security level zone can access lower security zone. Right? nNow look below the configuration:-
Now i want that dmz machine could also access the inside zome machine and for this I have make a access rule but is it necessary exempt the traffic between both network (DMZ and Inside) or without exemption it will work, if it needs exempt rule then why we should make this ruke. Can anyone help me??
Ok, so basically if someone from the inside (10.0.0.0) wants to talk with someone on the DMZ (192.168.10.0) they do not require any access list to be created. If the DMZ wants to INITIATE communication towards the inside network it will require an access list. This is because the security level of the interface does not let the lower interface initiate communicates to higher interfaces. This is why you'll need to make rules if anything in the DMZ needs to request communications from the inside network.
I think you are referring to NAT. If you have a static translation setup between your inside to your DMZ AND your DMZ to your inside, that will work as well as a NAT exemption. You can NAT from one address to the same address. For example:
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