Designing the Network Infrastructure for Physical Security in Visual C#.NET

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Designing the Network Infrastructure for Physical Security
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Many Internet filtering products act as add-ins on proxy servers or firewalls. Many proxy servers, such as Microsoft ISA Server, do not allow any connection to simply pass though. Rather, the proxy server creates a connection to the requested resource, such as a Web server, and relays it to the client. The client itself never actually connects to the Internet. The primary issue with proxy servers is that they are not firewalls and should not replace firewalls. Many proxies include the use of Network Address Translation (NAT). While NAT does hide the internal addresses, it is not a security control.
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IDS and IPS Considerations
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Intrusion detection systems (IDSs) alert administrators of suspected attack traffic or attempts to enter the network. Intrusion protection systems (IPSs) can be configured to respond to an attack. They can, for example, block traffic from the source of the attack. Considerations for using IDS and IPS include the following:
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Both systems can be effective additions to the securing of border control, and they can be used to detect internal attacks. IDS and IPS systems can be dedicated agents, computer systems, devices; however, the process of intrusion detection also incorporates inspection of process logs and security logs. Information about monitoring by using Windows logs is included in 9.
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VPN Considerations
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VPNs are often thought of as tunnels through the firewall. In that respect, they might be seen as tools that circumvent border controls. However, properly designed VPNs protect access to resources because they require authentication and encrypt traffic, thus protecting data that travels between two trusted networks or between a trusted cli ent and a trusted network. Another way of looking at it is to see VPNs as processes that extend the network beyond traditional borders. For more information about VPNs, see 7.
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Considerations for IP Protocol Packet Filtering with IPSec
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IPSec is often used to protect communications between devices or as the encryption protocol of choice in VPNs. The IPSec Request for Comments (RFCs) also describe the use of IPSec to block or allow specific protocols from entering or leaving a specific device s Transmission Control Protocol/Internet Protocol (TCP/IP) stack. Often referred to as IP protocol filtering with IPSec, this process is available in Windows when using IPSec policies. Within the policies, filters can be constructed to allow or block specific ports that have a source or destination of a specific IP address or range of addresses.
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Lesson 1
Designing Network Border Control
3-13
Just as a firewall or a packet-filtering router can be used to determine which ports can be used by traffic entering or leaving the network, an IPSec policy can be used to spec ify which ports can be used to send or receive traffic for a specific device. These types of policies can protect a specific computer in the following ways:
A Web server can be limited to receiving traffic on ports 80 (HTTP) and 443 (SSL), or a computer could be limited to receiving telnet traffic from only one specific computer. SQL server ports could be blocked on systems that do not need to allow network connections but run software which does so by default. Two types of policies can be written. Either the policy can block everything and then allow only specific ports, or the policy can allow everything and block only specific ports. When allow all/block some policies are used, only the specific ports that are blocked will be affected. A new filter must be written for each port that needs to be blocked. If a block all/allow some policy is written, care must be taken to understand exactly which ports must be open to enable the specific functioning of the device. It is rarely productive to attempt to apply IPSec block and allow policies to an entire network of computers, but policies can be applied via Group Policy or through scripts to apply the policies to many computers easily.
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