Troubleshooting IPsec VPNs
IPsec VPNs are discussed in significant detail in Chapter 13, “IPsec.” Because IPsec is a combination of multiple protocols, it is important to have a very strong understanding of how these protocols work together to troubleshoot IPsec. A thorough understanding of ISAKMP is also very useful in identifying negotiation problems in IPsec. This section looks at some of the tools available to troubleshoot IPsec, as well as some of the common issues surrounding its implementation.
IPsec's Order of Events
IPsec's order of events is important to know because IPsec interacts with a wide variety of protocols running on a router. Because IPsec adds an additional header on top of the original header with a changed IP address in ...