Cisco ASA 5505 host license limit workaround and dhcp lease time
Posted on 2014-01-12
We have a Cisco ASA 5505 with a 10 host license. For several years this tiny home office didn't need more than that. But, being in a home office, the number of business hosts as well as the family's personal inventory of smart devices (tablets, phones, smart TVs) has exceeded the host limit. The business runs on Windows SBS 2008 and we currently have an Engenius wireless access point but also have other wireless routers we could deploy.
My first question is simply this: how do I get the ASA to open up unused host connections when devices have left the building or been turned off? It seems like the machine keeps some connections a long time, even when the device has been shutdown. Is this related to DHCP lease times? If so, do I just need to shorten the lease time to something like 600 seconds (10 minutes)?
Will a short lease time create excessive overhead traffic?
The second question is: Should I set up a separate home network on another wireless router and use NAT to keep that traffic on a single address going to the ASA since it generally should not need to see any of the business LAN devices? We have a Comcast business Internet gateway, so maybe I can just plug that other router straight into the cable modem... guess I better look at the box and see if it has more LAN ports for that.