Placing The Vpn Server In Front Of The Firewall

By Author: Shirley Green
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If the VPN router is in front of the firewall, you must configure the firewall to allow any traffic that must be passed to the MCSA Certification from the internal net-work. Traffic that must be passed includes management communications with a RADIUS server, with domain controllers, and with clients that need to com?municate with the other site.
Configure input and output filters on the Internet interface of the VPN router to accept VPN protocols.
Configure the VPN router to accept only VPN protocol traffic. Routing is enabled on the external interface. If you do not block all traffic except the VPN traffic, you might forward unwanted traffic perhaps even an attacker's traffic—through the internal interface of the VPN server and through the fire?wall into your network.
Data is decrypted at the VPN router and passed to the firewall before entering the internal network. Use the firewall to filter traffic to the resources it can access, scan traffic for viruses, and perform intrusion detection.
No filters are necessary for ESP traffic on IP protocol 50. Filters ...
... are applied after IPSec removes the ESP header.

Placing the VPN server between two firewalls on a perimeter network Use the guidelines from both of the preceding arrangements. This arrangement pro-vides the best of both worlds because the VPN server is protected by the external firewall and the internal firewall can filter the traffic received by the Windows XP Professional.
Configure encryption strength to the strongest option available. This will provide
128-bit MPPE (for PPTP connections) and 3DES IPSec (for L2TP/IPSec) connections.

Use IAS if more than one remote access server is required. This means con?sistent remote access policy application and improved accounting.
Use packet filters on the remote access policy profile settings for the VPN connection to ensure that only traffic originating from remote access clients is accepted. The default remote access policy Connections To Microsoft Routing And Remote Access Server has these packet filters configured.
If an ISP's RADIUS database is used for authentication, use IAS proxy services to free exam papers direct authorization choices to internal remote access services. This provides you with control over authorizatio