I would appreciate if anyone can give me an advice for configuring the variable for the IP address of a particular router interface. All this is about
the router being a DHCP client which receives a new IP address every
now and then and using something like "$ETH0/0_IPADDR" instead of "ANY" in the access-list. As you know there's a way to use a variable with banner or hostname. Is there any way to do with the IP address?
Re: Use the variable for the IP address of IOS router
Assuming you don't want to settle for a limited "variable" through an ACL wildcard mask based on knowing the IP addr range assigned by DHCP, I think the EEM applet or script discussed in the following thread can conceivably be adapted to dynamically reconfigure the ACL accordingly:
action 060 cli command "access-list 113 permit ip any host $ipaddr"
action 070 cli command "end"
action 080 syslog msg "New IP address is $ipaddr"
Here, you'll want to replace FastEthernet0/0 with your interface name. This policy will run every 24 hours, every time the device reloads, or every time you run the command "event manager run update-acl". You can, of course, adjust any of the tags and trigger correlation.
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