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remote peer, where this must be resolvable by either a static DNS entry (name command) or a DNS server No general attributes apply to L2L tunnel groups; however, there are IPSec-specific ones Here s the syntax to configure the IPSec-specific tunnel group attributes for L2L connections:
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ciscoasa(config)# tunnel-group ciscoasa(config-tunnel-ipsec)# ciscoasa(config-tunnel-ipsec)# ciscoasa(config-tunnel-ipsec)# ciscoasa(config-tunnel-ipsec)# peer_IP_addr ipsec-attributes pre-shared-key key peer-id-validate {cert | nocheck | req} trust-point name_of_CA isakmp keepalive threshold seconds retry seconds
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If you ll be using a pre-shared key, configure it in the tunnel group with the preshared-key command: the maximum length of the key is 128 characters If you are using certificates, use the peer-id-validate command to specify their usage:
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cert If both peers support certificates and the use of certificates is negotiated during Phase 1, then certificates will be used; otherwise pre-shared keys will be used nocheck req
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Certificates are not used with this tunnel group
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Certificates must be used with this tunnel group or the L2L tunnel will fail
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The trust-point command specifies the name of the CA to use it indicates what identity certificate to use if more than one CA and identity certificate are installed on the appliance The name specified here needs to match the name configured with the crypto ca trust-point command discussed in 15; however, this command is unnecessary if the appliance has only one root and identity certificate, since it will use these by default To enable Dead Peer Detection (DPD), use the isakmp keepalive command The first threshold is the number of seconds between keepalives (10 to 3600), and the retry interval is how long the appliance should wait after the first keepalive is missed and the second one should be sent (2 10 seconds) DPD is disabled by default NOTE DPD sends keepalives across the management connection, allowing the appliance to detect a dead management connection Because this is Cisco-proprietary, it should only be enabled for a tunnel group that has Cisco devices for remote peers
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If your appliance is performing address translation on addresses as traffic goes to the public network or you have the nat-control command configured, requiring address translation, you will probably want to exempt translation for the traffic traversing the
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16:
IPSec Site-to-Site
ASA1 Internet Site 1 10010/24
ASA2
Site 2 10020/24
Figure 16-1 Address translation and crypto ACL example
site-to-site VPN; if you recall from 5, this is referred to as Identity NAT The exception to this is an extranet L2L where there might be overlapping addresses between the two companies Use the following syntax to implement identity NAT for your intranet L2L traffic:
ciscoasa(config)# nat 0 access-list ACL_ID
In the ACL, use permit statements to exempt the site-to-site traffic include both the source and destination addresses/networks As an example, examine the network shown in Figure 16-1 In this network, an Intranet IPSec L2L tunnel is being used, and address translation is not needed when traffic goes between the two sites Here s the Identity NAT configuration for asa1 to exempt the traffic from translation:
asa1(config)# access-list ACLnonat permit ip 10010 2552552550 10020 2552552550 asa1(config)# nat (inside) 0 access-list ACLnonat
ISAKMP PHASE 2 CONFIGURATION
This next section will focus on configuring the appliance so that the data connections, commonly called security associations (SAs), for an L2L connection can be built to a remote IPSec peer You must complete three tasks: Configure a crypto ACL, which determines what data traffic is to be protected Create a transform set, which determines how the data traffic is to be protected Create a crypto map entry for the remote peer, which brings all the parameters together for the associated peer
The following sections will cover these required configurations, as well as optional ones
Cisco ASA Configuration
NOTE If you ve configured these items on a Cisco IOS router before, then the syntax used by the appliances is either the same or very similar, making it easy to build IPSec L2L tunnels
Crypto ACLs
Crypto ACLs are used to define what data traffic should be protected by the IPSec tunnel Crypto ACLs are also used on Cisco IOS routers Unlike a normal ACL, a crypto ACL doesn t filter traffic: it defines what data traffic (Phase 2) is or isn t protected by the IPSec tunnel A permit statement in an ACL entry specifies traffic to be protected, and a deny statement (or the implicit deny) specifies traffic that should not be protected You need to be as specific as possible when specifying the traffic that is to be protected in other words, you definitely do not want to specify a source address and mask of 0000 0000 (or 0 0 for short), because this means that all traffic coming into the IPSec interface on the appliance is expected to be protected The appliance, in this situation, will drop all traffic that is not supposed to be protected, but based on your configuration, is expected to be protected, like Internet users web traffic for your DMZ web server NOTE For each remote site, you ll need a separate crypto ACL Crypto ACLs should be mirrored or symmetrical between the two peers For example, if you have two networks, network A and network B, on the network A side the crypto ACL would be to protect traffic from A to B; however, on the network B side, the crypto ACL would be to protect traffic from B to A Going back to Figure 16-1, here s the asa1 crypto ACL statement:
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