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The below given diagram is a Static NAT implementation. To ping from an IPv4 client to an IPv6 client across the router we have to ping the IPv4-mapped address of the corresponding IPv6 client.

For ex:- To ping from PC3 to PC1 we type the command Ping 192.168.2.2 which is the IPv4 mapped address of PC1.

But what we want to do is directly enter the IPv6 address when pinging from PC3 to PC1. ex:- Ping 2001:DB8:AAAA:B::206. The problem is that it is not able to ping by this command.

So is there any technique by which we can communicate from an IPv4 to IPv6 without the use of mapped addresses. The mapping should only take place within the router automatically.

Thank You in advance.

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  • You said that you want to directly ping an IPv6 address from PC3 which is not running an IPv6 stack, but then you said you want to "communicate from an IPv4 to IPv6". Doing a ping to an IPv6 address from PC3 is not going to utilize IPv4. Unless you run a dual-stack on PC3, you can't directly ping an IPv6 address.
    – user6423
    Jul 20, 2014 at 3:42
  • Exactly how do you "translate" IPv4 to IPv6?
    – user2084
    Jul 20, 2014 at 7:49
  • I want to ping from IPv4 to an IPv6 network (In the above diagram frm PC3 to PC1). The router has dual stack configuration. So how exactly can i do this ?
    – Ankit Kumar
    Jul 20, 2014 at 12:17
  • Bring IPv6 to the hosts.
    – Michael Hampton
    Jul 23, 2014 at 22:14
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can post and accept your own answer.
    – Ron Maupin ♦
    Jan 5, 2021 at 17:35

2 Answers 2

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You can't. IPv4 and IPv6 are 2 separate protocols. Without doing some form of protocol translation you cannot access IPv4 resources from IPv6 only hosts and no IPv6 resources from IPv4 only hosts.

Right now there are 3 standard methods:

  1. Dual-Stack everything

  2. For HTTP (and some other protocols): Use a proxy

  3. For a wider variety of protocols implement NAT64 with DNS64. This requires DNS and will not help with pinging IP addresses.

Some older literature will mention NAT-PT which is deprecated and should not be used anymore.

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I ping and send packets from an IPv4 address to an IPv6 address by allocating an IPv4 /24 for NAT64 and doing that translation on my NAT64 router which is between the two networks.

I use TAYGA on my dual stack NAT64 router to do the translation and on one of the NAT64 router interfaces it has only an IPv4 address and on the other interface it has only an IPv6 address.

TAYGA has the capability to set manual "mappings" between IPv4 and IPv6 addresses as well as dynamically assign IPv4 addresses for temporary mappings and it works both ways, from IPv4 -> IPv6 and from IPv6 -> IPv4.

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