Timeline for What is the use-case of including the IPv4 address in IPv6 address?
Current License: CC BY-SA 4.0
8 events
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| Nov 12, 2018 at 11:12 | comment | added | Martin | @MichaelHampton I see. And I guess that if this this technique is used, then it is used on servers rather than on router interfaces? I would assume that service providers usually simply assign the first address of the subnet or EUI-64 address on router interface? | |
| Nov 11, 2018 at 16:21 | vote | accept | Martin | ||
| Nov 9, 2018 at 23:36 | comment | added | Michael Hampton | @Martin The only real "benefit" is to free up space in the admin's head, but this purpose is better served by DNS, and of course the drawbacks of manual addressing are even more pronounced in IPv6 than IPv4. | |
| Nov 9, 2018 at 23:04 | comment | added | kasperd |
I can think of four other cases of IPv4 addresses embedded in IPv6 addresses, but none of them good candidates for using this notation. ::192.168.0.1 is an example that would usually be written using this notation, but that prefix is deprecated. 6to4 gateways and Teredo server addresses have their IPv4 address embedded in IPv6 addresses, but not in the last 32 bits, so those are not candidates for this notation. Teredo client addresses are embedded in the last 32 bits, but the bits are negated so it would just be confusing to use this notation for those. Are there any other examples?
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| Nov 9, 2018 at 18:22 | comment | added | chrylis -cautiouslyoptimistic- | @Martin They're usually assigned as extra addresses, and it's so that SSH to the IP address is easier to remember. | |
| Nov 9, 2018 at 17:21 | comment | added | Martin | Thanks! Is there a valid use-case to manually assign IPv6 addresses that have the host-part equal to the hosts IPv4 address? I can clearly see a benefit of using the penultimate byte of the IPv4 address in IPv6 address network portion(this works only in case of /24 IPv4 networks), but I hardly see a benefit of putting the IPv4 address into host-portion of the IPv6 address. Even if there are multiple IPv4 addresses on the interface(for example 192.0.2.22/24 and 192.0.2.25/24) and same amount of IPv6 addresses are needed, then it would make sense to take those from the beginning of the network. | |
| Nov 9, 2018 at 16:14 | comment | added | Michael Hampton | Then there are the network admins who manually assign IPv6 addresses that have the host-part equal to the host's IPv4 address.... | |
| Nov 9, 2018 at 15:59 | history | answered | Sander Steffann | CC BY-SA 4.0 |