By International Business Machines Corporation
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Extra info for A comprehensive guide to virtual private networks. Volume II
3 The toll of logging In a smilar way, the logging of messages and events that relate to VPN traffic is likely to cause a performance impact. This impact will again be different on clients, servers and gateways. The problem to solve in this case is quite delicate: 1. If you abandon logging alltogether, you risk to compromise the security of your network because you will be unable to detect intrusion attempts and other attacks. A good security policy always includes a certain amount of logging. 2.
This would allow additional security checks, such as virus protection and content inspection, to be performed before data from an external system was allowed into the corporate network. With the establishment of this VPN, the parts supplier can have global, online access to the manufacturer′s inventory plans and production schedule at all times during the day or night, minimizing manual errors and eliminating the need for additional resources for this communication. fm Draft Document for Review October 15, 1999 12:20 pm assured that the data is securely and readily available to only the intended parts supplier(s).
By exploiting the Internet, branch office connection VPNs can be easily established to meet the company′s needs. Branch Office Intranet Corporate Intranet ISP ISP Router Internet Router VPN Server Client Firewall Firewall Authentication Encryption Figure 5. Branch office VPN As shown in Figure 5 on page 16, one way to implement this VPN connection between the corporate headquarters and one of its branch offices is for the company to purchase Internet access from an ISP. Firewalls, or routers with integrated firewall functionality, or in some cases a server with IPSec capability, would be placed at the boundary of each of the intranets to protect the corporate traffic from Internet hackers.
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