IPv6 and IPv4 addresses on the same network

975 pts.
Tags:
IP Address Allocation
IP address management
IPv4
IPv6
IPv6 addressing
Network management
How can I have IPv6 and IPv4 addresses co-existing on my network allowing them to talk to each other even though most clients only have one or the other?
ASKED: July 8, 2011  5:52 PM
UPDATED: March 31, 2012  9:55 PM

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Hi

IPv6 cannot directly talk to IPv4. Usually you would have dual-stacked clients that can access IPv4-only applications as well as IPv6-only applications. This allows to slowly shift more and more traffic from IPv4 to IPv6 by setting up more and more IPv6-only applications.

If you need IPv6 to talk to IPv4 directly, you need translation. Currently there is a specification called NAT64/DNS64 which allows access to IPv4 applications by IPv6 clients.

Hope this helps
Silvia

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  • TomLiotta
    If most clients "only have one or the other", I don't see how they could talk without some intermediate router/switch that can handle both. The clients themselves wouldn't seem to have much possibility even of using some of the tunneling or encapsulation methods, if they could only talk one or the other. Actually, I haven't run across anything that only has IPv6 without also allowing IPv4. But my experience is narrow for this area. IPv6 interfaces that I've directly worked with have handled IPv4-mapped IPv6 addresses, so I haven't had to dig into it deeply yet. The rest of the above Wiki link has lots of useful background information that might be helpful. Tom
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  • TeachMeIT
    [...] TomLiotta shares his knowledge on IPv6 and IPv4 addresses on the same network. .topsy_widget_shortcode,div.topsy-sm {display:inline;} .post {padding-left: 10px;}   [...]
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