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#How to configure lan and wan asa 5505 cisco how to#
My example below shows how to configure VPN’s between 3 sites but can be modified for the following scenarios without much explanation: site-to-site VPN between 2 sites (Just remove SiteC duh) site-to-site to 3+ sites (just follow the. Instead if you issue a ping from a higer security level interface host toward a lower security level interface host with icmp. We will cover how to design a fundamental ACL (Access Control List), Network Address Translation (NAT), and a basic. This article will explain how to configure a Site-to-Site IPSec VPN using Cisco ASA 55XX’s using IKEV1. If you try to ping the ip address 1.1.1.1 from any of your inside hosts in the network 2.2.2.0/24 it wont work, and that is one of those default behavior of ASA. The following illustration is the system topology that the Cisco ASA 5506-X model depends on. ISP(config-router)#network 203.1.1.0 0.0.0.255 area 0 Today, in the Cisco ASA 5506-X model, we will cover the ASA firewall configuration step-by-step, for your typical business organization. Ip range 172.16.1.5 – 172.16.1.6 ciscoasa(config)#dhcpd address 172.16.1.5-172.16.1.6 insideĬiscoasa(config)#dhcpd dns 8.8.8.8 interface inside Configure Default Route on Cisco ASA ciscoasa(config)#route outside 0.0.0.0 0.0.0.0 203.1.1.1 Configure Dynamic Route on Cisco Router (OSPF 1) ISP(config)#router ospf 1 ISP(config-if)#no shutdown Configure DHCP server and DNS server on Cisco ASA ISP(config)#interface gigabitEthernet 0/1
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Router ISP ISP(config)#interface gigabitEthernet 0/0 Topology Configuration Assign IP on Cisco ASA and ISP Router and set Interface Inside and Outside on Cisco ASAĬisco ASA ciscoasa(config)#interface vlan 1Ĭiscoasa(config)#no dhcpd address 192.168.1.5-192.168.1.35 insideĬiscoasa(config-if)#ip address 172.16.1.1 255.255.255.0Ĭiscoasa(config-if)#ip address 203.1.1.2 255.255.255.0Ĭiscoasa(config-if)#switchport access vlan 1Ĭiscoasa(config-if)#switchport access vlan 2 They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet.Ī firewall can be hardware, software, or both. Nat (INSIDE,OUTSIDE) after-auto source dynamic any interface Nat (OUTSIDE,INSIDE) source static any any destination static interface OG_N_EXAMPLEHOSTS service O_S_EXAMPLE1 O_S_EXAMPLE2 Syntactically, the following set of statements is valid (at least as of 8.A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules.įirewalls have been a first line of defense in network security for over 25 years. The second nat statement is fairly obvious - it simply translates everything outbound to the WAN IP, in a typical hide-NAT/LAN-to-WAN scenario. However, the first nat defines a (probably invalid) rule directing any inbound request for the WAN IP over TCP/60001 to be sent to either of 192.0.2.1:60002 or 192.0.2.2:60002. packet-tracer input INSIDE tcp 10.1.1.1 60002 192.0.2.1 60002 "succeeds", in that it says the final action is to allow, and along the way it translates to 192.0.2.1, but does not indicate the ouput interface.packet-tracer input OUTSIDE tcp 192.0.2.100 12345 192.0.2.1 60001 "succeeds", in that it says the final action is to allow, and along the way it untranslates to 10.1.1.2 and identifies the output interface as INSIDE.Packet-tracer doesn't balk at it (at least, assuming an access-group permits): The ASA command-line lets you enter it without error. Answer (1 of 2): As the name suggests VPN filters provide the ability to permit or deny post-decrypted traffic after it exits a tunnel and pre-encrypted traffic before it enters a tunnel. What it does not do (and what I think might have been the original intent) is distribute between the two target IPs, nor track which of the two hosts is up and establish a translation to an available node. I don't believe that ASA has any function for that (although I'm happy to be proved wrong!) beyond tracked routes, which are more to do with outbound, LAN-to-multi-WAN traffic. # nat (OUTSIDE,INSIDE) source static any any destination static interface O_N_EXAMPLE2 service O_S_EXAMPLE1 O_S_EXAMPLE2 I note that splitting the nat statement into two statements results in an ovelap warning: # nat (OUTSIDE,INSIDE) source static any any destination static interface O_N_EXAMPLE1 service O_S_EXAMPLE1 O_S_EXAMPLE2 In practice I expect it accepts the inbound and drops the reply traffic, resulting in a failed TCP handshake. WARNING: mapped-address 192.0.2.2/60002-0 ovelap with existing static NAT.