access-list acl_dmz deny ip 172.16.0.0 255.255.255.0 192.168.0.0 255.255.0.0
access-list acl_dmz permit ip 172.16.0.0 255.255.255.0 any
Because of first match, this works - anything from dmz to inside that is permitted catches on the permissive rules, anything that isn't gets blocked by the deny rule that applies from the dmz netblock to the inside netblock(s), finally, the permit ip any any rule allows all out, but to get to that rule, the destination cannot have been in the deny rule's destination block
Re: ACL: Limit DMZ to Inside while allowing all DMZ to Internet?
I do the same thing on our firewalls. Basically, you will need to organize the access-list starting with INSIDE destinations first, then the stuff that needs to go on the Internet. For example, let's say you have defined two statics from the inside to the DMZ:
access-list dmz permit udp host dmz_dns any eq domain
access-list dmz permit tcp host dmz_mail any eq smtp
It is very important to put the lines with a destination of "any" AFTER the lines that go to a specific hosts. It is also important to have the "deny ip" statements in there before the lines that permit traffic to go anywhere. Using the same two statics above, let's say you just put a statement that permitted dns to any destination. Because you have two statics, that permit statement would allow dns queries to go to both internal_dns and internal_mail (which you obviously wouldn't want). This is a very common mistake that PIX admins make when configuring their firewalls.
DocumentationCode download linksGoalRequirementLimitationsSupported ISR
and UCS-E ModelSupported ISRG2 and UCS-E Blades:Supported ISR4K and
UCS-E Blades:Step by Step ConfigurationConfigure one of the connectivity
options to access the Cisco IMC from the n...
Firepower Threat Defense (NGFWv) on UCS E-series - Transparent Mode in
HA DocumentationCode download linksGoalRequirementLimitationsSupported
ISR and UCS-E ModelSupported ISRG2 and UCS-E Blades:Supported ISR4K and
UCS-E Blades:Step by Step ConfigurationCo...
Question I am currently unable to specify "crypto keyring" command when
configuring VPN connection on my cisco 2901 router. The following
licenses have been activated on my router :