Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

header name is configurable.) The Email Security appliance matches the remote 
user’s IP address from the header and the connecting proxy’s IP address against 
the allowed user and proxy IP addresses in the access list.

AsyncOS supports only IPv4 addresses in the 

x-forwarded-for

 header.

You can create the network access list either via the Network Access page in the 
GUI or the 

adminaccessconfig > ipaccess

 CLI command. 

 shows 

the Network Access page with a list of user IP addresses that are allowed to 
connect directly to the Email Security appliance.

AsyncOS offers four different modes of control for the access list: