how to generate barcode in asp.net c# Placing the VPN server in front of the firewall in Visual C#

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Placing the VPN server in front of the firewall
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Designing Secure Communications Between Networks
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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 VPN server.
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Firewall Configuration Information to Support PPTP and L2TP/IPSec VPNs
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Firewall configuration is important. Without proper configuration, one or both of two problems will exist. First, the VPN traffic, other required traffic, or both will not be able to pass through the firewall. Second, too much access will be granted to your network, thus making you more vulnerable to attack. It is not the designer s job to configure the firewall. Instead, the designer should supply the firewall administrator with the infor mation necessary to provide secure remote access. Tables 7-2 and 7-3 list the appropriate ports required to permit PPTP VPN traffic. Remember to consider both incoming and outgoing traffic and apply filters that meet the requirements appropriately.
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See Also 4 provides information about configuring a firewall for Active Directory authentication traffic.
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Table 7-2
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PPTP Input Filters: Packets That Should Not Be Dropped
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Subnet Mask Destination Port TCP 1723 Protocol ID 47 TCP source port 1723 Purpose PPTP tunnel maintenance PPTP tunneled data to router Only for the calling router
Interface IP
Internet interface VPN 255.255.255.255 router Internet interface of router VPN router Internet interface
Table 7-3
255.255.255.255 255.255.255.255
PPTP Destination Output Filters: Packets That Should Not Be Dropped
Subnet Mask Source Port TCP 1723 Protocol ID 47 Purpose PPTP tunnel maintenance PPTP tunneled data to router
Source Interface IP
Internet interface VPN 255.255.255.255 router Internet interface of router VPN router Internet interface 255.255.255.255 255.255.255.255
TCP source port 1723 Only for the calling router
Lesson 2
Designing VPN Connectivity
7-23
Tables 7-4 and 7-5 provide configuration specifications for L2TP/IPSec.
Table 7-4
L2TP/IPSec Input Filters: Packets That Should Not Be Dropped
Subnet Mask 255.255.255.255 255.255.255.255 255.255.255.255 Destination Port UDP 500 UDP 4500 UPD 1701 Purpose Internet Key Exchange (IKE) IPSec NAT-T (if necessary) L2TP traffic
Destination Interface IP Internet interface VPN router Internet interface of router VPN router Internet interface
Table 7-5
L2TP/IPSec Destination Output Filters: Packets That Should Not Be Dropped
Subnet Mask 255.255.255.255 255.255.255.255 255.255.255.255 Source Port UDP 500 UDP 5500 UDP 1701 Purpose IKE traffic
IPSec NAT-T (if required)
L2TP traffic
Source Interface IP Internet interface VPN router Internet interface of router VPN router Internet interface
Guidelines for Designing Secure VPN Connectivity
Many VPN connectivity design decisions are limited by the existing network infrastruc ture, existing clients that must remotely access the network, and a lack of management support for sound security practices. But a secure VPN infrastructure can be devel oped. Use the guidelines in the following sections to do so.
Guidelines for Installation
Follow these guidelines for installation:
Rename the external interface, naming it Internet, External, or something that will identify it as the interface configured for the Internet. Doing this will prevent you from making configuration mistakes. Configuration mistakes can weaken security on the server. Use the Remote Access Server Setup Wizard, and choose the Remote Access (Dialup or VPN) selection instead of choosing Secure Connection Between Two Private Networks. The former setting prompts you to make several important security configurations; the latter does not. (With the latter setting, default settings are used.) Settings made by selecting VPN are as follows:
You are prompted to choose whether VPN, dial-up, or both types of access are needed. You should always select only what will be used on this computer. You can choose to have packet filters for the interface allow only PPTPrelated and L2TP-related traffic. If you do this, all other traffic will be dropped. This approach greatly enhances the security of the computer by ensuring only the VPN traffic can make a connection.
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7
Designing Secure Communications Between Networks
You are prompted to decide whether to use an internal Dynamic Host Configuration Protocol (DHCP) server to assign addresses for the VPN routers that connect, or whether you want to define a range in the interface. You are prompted to decide whether to use RADIUS or Windows authen tication.
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