HPE FlexNetwork 5510 HI Series Security Configuration Manual page 141

10. The security policy server authorizes the user to access certain network resources based on
the check result. The access device saves the authorization information and uses it to control
access of the user.
Re-DHCP authentication process (with CHAP/PAP authentication)
Figure 41 Re-DHCP authentication process
Authentication
client
1) Initiate a connection
8) The user obtains a new IP address
The re-DHCP authentication process is as follows:
Step 1 through step 7 are the same as those in the direct authentication/cross-subnet authentication
process.
8. After receiving the authentication success packet, the client obtains a public IP address through
DHCP. The client then notifies the portal authentication server that it has a public IP address.
9. The portal authentication server notifies the access device that the client has obtained a public
IP address.
10. The access device detects the IP change of the client through DHCP and then notifies the portal
authentication server that it has detected an IP change of the client IP.
11. After receiving the IP change notification packets sent by the client and the access device, the
portal authentication server notifies the client of login success.
12. The portal authentication server sends an IP change acknowledgment packet to the access
device.
Step 13 and step 14 are for extended portal functions.
13. The client and the security policy server exchanges security check information. The security
policy server detects whether or not the user host installs anti-virus software, virus definition
files, unauthorized software, and operating system patches.
14. The security policy server authorizes the user to access certain network resources based on
the check result. The access device saves the authorization information and uses it to control
access of the user.
Portal Web
authentication
server
2) User information
7) Authentication success
11) Notify login success
Portal
Access
device
server
3) CHAP authentication
4) Authentication request
Timer
6) Authentication reply
9) Discover user IP change
10) Detect user IP change
12) IP change
acknowledgment
13) Security check
14) Authorization
128
AAA server
policy server
5) RADIUS
authentication
Security