- Cisco asdm 5.2 how to set up static nat for dmz pdf#
- Cisco asdm 5.2 how to set up static nat for dmz verification#
You can change this behavior though.Ĭiscoasa(config)# same-security-traffic permit intra-interface This does not happen with the ASA by default. If the ASA was a normal router, then the traffic would go to the ASA and then get redirected to your internal LAN2 router. By default, the ASA does not allow traffic redirection in order for the initial packet from 172.18.0.0 to reach LAN2. Regarding your new problem, this happens because your inside zone hosts (172.18.0.0) have as default gateway the ASA inside IP. I suggest you to modify your DMZ access list and allow ONLY the required IP and protocols needed. The attacker from DMZ can easily propagate into your LAN2 network. If a host in your DMZ gets compromised from the Internet, then you also expose your internal LAN2 to danger.
You said that you let all communication from DMZ to LAN2 open.
Cisco asdm 5.2 how to set up static nat for dmz pdf#
DOWNLOAD THIS ARTICLE AS PDF FILEīe careful with your DMZ. The routes denoted with “S” are the static routes and the ones denoted with “C” are the directly connected routes. * – candidate default, U – per-user static route, o – ODR I – IS-IS, L1 – IS-IS level-1, L2 – IS-IS level-2, ia – IS-IS inter area N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2Į1 – OSPF external type 1, E2 – OSPF external type 2, E – EGP Let’s now see how to check the routing table in the ASA appliance and verify the static route:Ĭodes: C – connected, S – static, I – IGRP, R – RIP, M – mobile, B – BGPĭ – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
Cisco asdm 5.2 how to set up static nat for dmz verification#
! Then configure an internal static route to reach network LAN2ĪSA(config)# route inside 192.168.2.0 255.255.255.0 192.168.1.1 Verification Commands ! First configure a default static route towards the default gatewayĪSA(config)# route outside 0.0.0.0 0.0.0.0 200.1.1.1 The format of the static route command is:ĪSA(config)# route For directly connected networks (DMZ and LAN1) we don’t need to configure a static route since the firewall already knows about these networks as they are directly connected to its interfaces. One Default Static route for Internet access, and one internal static route to reach network LAN2. So we need to configure two static routes.
Therefore, in order for the ASA to reach network LAN2, we need to configure a static route to tell the firewall that network 192.168.2.0/24 can be reached via 192.168.1.1. Rather, there is an internal router with address 192.168.1.1 through which we can reach LAN2. LAN2 is not directly connected to the firewall. Additionally, there is another internal network, namely LAN2, with network 192.168.2.0/24. LAN1 is directly connected to the Inside interface of the firewall. The default gateway towards the ISP is 200.1.1.1. The ASA connects to the internet on the outside and also has a DMZ and Internal zones.