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Generation PDF 417 in C# PART III

PART III
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VPN Troubleshooting
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Notice that the VPN client does not perform certificate revocation checking for the certificates in the certificate chain of the authenticating server s computer certificate. The assumption is that the VPN client does not yet have a connection to the network, and therefore cannot access a Web page or other resource in order to check for certificate revocation.
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Unable to Reach Locations Beyond the VPN Server
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Now that we have established successful connectivity, we are done with most of the battle. Access to the network is achieved, but now we need to make sure that all the appropriate resources are reachable. If VPN clients are unable to send and receive traffic from locations on the intranet that are beyond the VPN server, check the following:
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Verify that either the protocol is enabled for routing or that dial-in clients are
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allowed to access the entire network for LAN protocols being used by the VPN clients.
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Verify the IP address pool of the VPN server.
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If the VPN server is configured to use a static IP address pool, verify that the routes to the range of addresses defined by the static IP address pool are reachable by the hosts and routers of the intranet. If they are not, you must add IP routes consisting of the VPN server static IP address ranges, as defined by the IP address and mask of the range, to the routers of the intranet, or you must enable the routing protocol of your routing infrastructure on the VPN server. If the routes to the remote access VPN client subnets are not present, remote access VPN clients cannot receive traffic from locations on the intranet. Routes for the subnets are implemented either through static routing entries or through a routing protocol, such as Open Shortest Path First (OSPF) or Routing Information Protocol (RIP). If the VPN server is configured to use DHCP for IP address allocation and no DHCP server is available, the VPN server assigns addresses from the APIPA address range from 169.254.0.1 through 169.254.255.254. Allocating APIPA addresses for remote access clients works only if the network to which the VPN server is attached is also using APIPA addresses. If the VPN server is using APIPA addresses when a DHCP server is available, verify that the proper adapter is selected from which to obtain DHCP-allocated IP addresses. The Routing And Remote Access Server Setup Wizard assigns the default adapter automatically. You can manually choose a LAN adapter from the Adapter list on the IP tab on the Properties sheet for a VPN server in the Routing And Remote Access snap-in. If the static IP address pool contains a range of IP addresses that are a subset of the range of IP addresses for the network to which the VPN server is attached, verify that the range of IP addresses in the static IP address pool
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11
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Troubleshooting Remote Access VPN Connections |
are not assigned to other TCP/IP nodes, either through static configuration or through DHCP.
Verify that there are no packet filters on the profile properties of the remote
access policy corresponding to VPN connections that are preventing the sending or receiving of traffic.
Summary
Windows VPN clients and VPN servers provide a large set of troubleshooting tools for diagnosing and gathering information about remote access VPN connections. VPN clients and servers can use TCP/IP troubleshooting tools such as Ping and Tracert. A VPN server can use authentication and accounting logging, event logging, tracing, Oakley logging, and Network Monitor. The most common problems with remote access VPN connections are the inability to establish a successful connection and the inability to reach locations beyond the VPN server. Make sure to follow the processes and steps in this chapter closely they are the same troubleshooting steps the Windows product team uses to test the Windows operating system, so you should be able to get all the issues worked out quickly and easily.
12
Troubleshooting Site-to-Site VPN Connections
In 11, Troubleshooting Remote Access VPN Connections, we went through the extensive and involved procedures for troubleshooting remote access virtual private networks (VPNs). The process for troubleshooting site-to-site VPNs is similar in many ways and uses the same procedures. We will go through the pro cess in detail again for many areas so that you have a complete and comprehensive troubleshooting methodology to use. Where it doesn t make sense to repeat infor mation, we will refer to 11. In this chapter, we list the set of troubleshoot ing tools provided with Microsoft Windows that you can use to gather information about connections, and then describe what to look for to correct the most common problems with site-to-site VPN connections. Remember from the previous chapter, the two things to keep in mind when trying to troubleshoot VPNs:
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