Cisco ASA 5505 User License Explained
I get a lot of questions regarding the meaning of user license numbers for the Cisco ASA 5505. This model is offered in three User License options. 10 users, 50 users and UL (unrestricted license). The meaning of user license basically refers to concurrent IP addresses that can communicate between Internal (inside) network and Internet (outside) interface. So, for 10 user license, only 10 concurrent internal hosts (IP addresses) can access the internet. The same applies for 50 users (only 50 concurrent IP addresses can access the Internet). For UL license, there is no such restriction.
The user licensing has also an effect on the maximum number of IP addresses that can be assigned by the DHCP server of the ASA5505 to the internal hosts. For a 10-user license, the max number of DHCP clients on the internal network is 32. For 50-user license, the max number of DHCP clients is 128.
The official explanation from Cisco regarding the Cisco ASA5505 user licensing is as follows:
“In routed mode, hosts on the inside (Business and Home VLANs) count towards the limit only when they communicate with the outside (Internet VLAN). Internet hosts are not counted towards the limit. Hosts that initiate traffic between Business and Home are also not counted towards the limit. The interface associated with the default route is considered to be the Internet interface. If there is no default route, hosts on all interfaces are counted toward the limit. In transparent mode, the interface with the lowest number of hosts is counted towards the host limit. See the show local-host command to view host limits. “
The terms “Business” and “Home” VLANs above refer to the Internal and DMZ network zones.
Tagged with: cisco asa 5505 user license
Filed under: Cisco ASA Hardware
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