What problems, if any, may arise when existing IPv4 networks convert hardware, appliances and middleware to IPv6?
The network layer should experience few, if any, issues migrating from IPv4 to IPv6 when utilizing router hardware and software from the major router vendors. Typically, only the software image needs to be upgraded. If an older router is used, a memory upgrade will most likely will be needed in addition to a software image upgrade. In some instances, a newer software image may dictate that the router hardware may need to be upgraded or replaced, depending on the age of the device. On older hardware appliances and middleware that had IPv4 addresses specifically hard coded into the firmware or software could cause problems, especially if the devices, firmware or software have not been reviewed for IPv6 compatibility. For example, a Point of Sale (PoS) terminal, commonly used in hundreds of thousands of businesses worldwide was reviewed for the Y2K date issue may be functioning correctly, but it may not have network capability. If it does have network capability, it may not be able to spe
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