For the most part, all of the IPv4 and IPv6 interoperability issues are due to misconfigurations, however, in some rare cases, software and hardware defects or bugs may cause problems with some of the mechanisms described in the previous section. Prior to jumping to such conclusions, however, first check and then double-check your configurations. After checking and double-checking your configurations, if you are still convinced that the desired mechanism has been configured correctly, contact the TAC for further assistance in your troubleshooting effort. Some common problems encountered with the tunneling mechanisms described in the previous section include the . . .
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