Barracuda Networks VERSION SP4 manual Dhcp

The following steps are carried out when a connection is to be established:

1.) Client opens a socket on the server, starts authentication and requests configuration

2.) Client receives configuration (IP, subnet mask, WINS, DNS,…)

3.) Client sends received information to the SPAC

4.) Client triggers ipconfig/renew for the Barracuda NG VPN Virtual Adapter

5.) SPAC answers DHCP requests for the Adapter with the configuration data

6.) Operating system reconfigures the Virtual Adapter

7.) VPN Service introduces additional routes

8.) The corresponding rule set for the Barracuda NG Personal Firewall is implemented.

Fig. 12–2Connection procedure

User space					Step 1
					Step 2
NG VPN					Step 3
					Step 4
component			3
				4	Step 5
2	1	5	SPAC	DHCP	Barracuda Networks VPN
Kernel
					server
					Port 691 or
				NG VPN	443 via Proxy
Device
			Virtual Adapter
					Ethernet
				1	2
Hardware

171 Barracuda NG Network Access Client - Administrator’s Guide