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You can assign an IP address to the appliance for management purposes This IP address has to be from the subnet the two interfaces are connected to For example, if you reexamine the right side of Figure 21-1, the management address would have to be an unused address from 10010 When you re assigning a management IP address to the appliance, the address must be from the subnet connected to the two interfaces on the appliance Here s the command to configure the management address:
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ciscoasa(config)# ip address IP_address [subnet_mask] [standby IP_address]
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Notice that the ip address command is a global command you are not in an interface when configuring it The standby parameter assigns a management IP address to the standby unit in a failover configuration (failover is discussed in 23) Use the show ip address command to verify your management IP address configuration NOTE The assignment of a management address is optional Also the management address is just that: a management address For devices in the subnet, do not point them to this address as a default gateway Remember that the appliance is in transparent mode, acting as a layer 2 device: it is not acting as a router
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As I mentioned in the Bridges vs Transparent Mode section, the appliances will build a MAC address table of source MAC addresses associated with an interface You can view the MAC address table with the show mac-address-table command:
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ciscoasa# show mac-address-table [logical_if_name | count | static]
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Without any parameters, all the MAC addresses in the table are shown You can limit the display to MAC addresses associated with a particular interface, to a count of the total addresses in the table, or to listing just the statically defined entries Here s an example of this command:
ciscoasa# show mac-address-table Interface Mac Address Type Time Left ----------------------------------------------outside 00097cbe2101 static inside 00107cbe6102 static inside 00097cbe5103 dynamic 10
Notice that the first two entries have been statically defined (discussed later in this section) and the last dynamically learned Dynamically learned MAC addresses will be aged out of the table if they are idle for 5 minutes by default This timer can be changed with the mac-address-table aging-time command
ciscoasa(config)# mac-address-table aging-time minutes
mac-address-table static command:
If you want to hard-code a MAC address association for a logical interface, use the
ciscoasa(config)# mac-address-table static logical_if_name mac_address
This is sometimes done to prevent MAC address spoofing of critical services like a default gateway or DHCP server You can even completely disable MAC address learning on an interface with this command:
ciscoasa(config)# mac-learn logical_if_name disable
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If you disable learning, then you must configure the necessary MAC address static entries for the interface, or only broadcasts and multicasts will be allowed on the interface And if you re having problems with the MAC address learning function or the static entries you built on the appliance, you can use the debug mac-address-table command to troubleshoot the problems
ADDITIONAL LAYER 2 FEATURES
This section will discuss the configuration of a couple of enhanced layer 2 features of transparent mode: Ether-Type ACLs and ARP inspection
Non-IP Traffic and Ether-Type ACLs
When you re operating in routed mode, the only way to get non-IP traffic to flow through the appliance is to encapsulate it in GRE and tunnel it through the appliance using this layer 3 TCP/IP protocol The appliances do not handle non-IP traffic natively this must be handled by a different device (typically a router) The problem with a different device handling the traffic is that it isn t very efficient: you re adding overhead to the process and introducing delay by having to encapsulate and de-encapsulate every packet If you re concerned about this process, you can run your appliance in transparent mode instead Unlike TCP/IP unicast traffic, which uses security levels to determine whether a connection is allowed, all non-IP traffic is denied by default when running in transparent mode To allow non-IP traffic, you must create an Ether-Type ACL (or ACLs) and apply it to each interface you want to allow the non-IP traffic on The syntax for creating an Ether-Type ACL is as follows:
ciscoasa(config)# access-list ACL_ID ethertype {deny | permit} {ipx | bpdu | mpls-unicast | mpls-multicast | any | hex_#_of_protocol} [log]
Notice that the ethertype parameter specifies that this is not an IP ACL Following the permit or deny parameter, you specify the protocol that will be matched on Optionally you can specify a hexadecimal number greater than or equal to 0x600 for the protocol (currently you cannot filter on actual MAC addresses in the Ethernet frame header) For example, TCP/IP uses a protocol number of 0x0800 and AppleTalk uses 0x809b Once you have created your Ether-Type ACL, you need to apply it to an interface with the access-group command, which was discussed in 5:
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