![]() In order to implement LAN-to-LAN tunnels between a PIX and another VPN device with the help of the private addresses, use the nat 0 command to bypass NAT. Therefore, an IP packet that has a source and destination address that matches the ACL defined in the nat 0 command bypasses all the NAT rules on the PIX. The ACL in the nat 0 command defines the source and destination address for which the NAT rules on the PIX are disabled. ![]() The nat 0 ACL defines what should not be included in NAT. After that, ACLs for the crypto maps are checked. When an IP packet arrives at the inside interface of the PIX, Network Address Translation (NAT) is checked. Understand the General Sequence of Events The configuration uses the same ACL as the nat 0 ACL. In the problematic configuration the interesting traffic, or the traffic to be encrypted for the LAN-to-LAN tunnel, is defined by ACL 140. Isakmp policy 20 authentication pre-share Isakmp policy 10 authentication pre-share !- The isakmp policy defines the Phase 1 SA parameters. !- The isakmp key command defines the pre-shared key for the peer address. !- The crypto map commands define the IPsec !- Security Assocation (SA) (Phase II SA) parameters.Ĭrypto map mymap 5 set peer 172.16.172.39Ĭrypto map mymap 5 set transform-set mysetĬrypto map mymap 10 ipsec-isakmp dynamic dynmap crypto ipsec transform-set myset esp-des esp-md5-hmacĬrypto dynamic-map dynmap 10 set transform-set myset ![]() !- The crypto ipsec command defines IPsec encryption and authen algo. !- The sysopt command bypasses conduits or ACLs that check to be applied !- on the inbound VPN packets after decryption. !- The nat 0 command bypasses NAT for the packets destined over the IPsec tunnel. !- IP addresses on the outside and inside interfaces. !- Access-List “140” defines interesting traffic to bypass NAT for VPN !- and defines VPN interesting traffic. Troubleshoot the PIX Network DiagramĮnable password 2KFQnbNIdI.2KYOU encrypted Refer to the Cisco Technical Tips Conventions for more information on document conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on these software and hardware versions:Ĭisco 1720 Router that runs Cisco IOS® Software Release 12.2(6) There are no specific requirements for this document. The inability to pass data is the result of a configuration with the same access control list (ACL) for both the nat 0 and the static crypto map for the LAN-to-LAN IPsec peer. This occurs because the PIX has a LAN-to-LAN IPsec tunnel to a router and also a VPN Client. In other words, the VPN Client and PIX cannot pass encrypted data between them. The inability to pass data on an established IPsec tunnel between a VPN Client and a PIX is frequently encountered when you cannot ping or Telnet from a VPN Client to any hosts on the LAN behind the PIX. This document addresses and provides a solution to the problem of why a successfully established IPsec tunnel from a Cisco VPN Client to a PIX is unable to pass data.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |