bash - ipv6calc outputs wrong address when converting from ipv4 to ipv6? -


having strange issue while trying convert ipv4 list file ipv6:

ipv6calc -q --action conv6to4 --in ipv4 1.1.23.1 --out ipv6 2002:101:1701::

trying validate result correct, used online converters , seems 1.1.23.1 2002:0:0:0:0:0:101:1701 (or else 2002::101:1701). last "::" should removed & 2002 should have ":".

i don't want use sed/awk commands in order manipulate result, questions are:

  1. is there alternative cmd/linux sw?
  2. is somehow fixed inside ipv6 calc, doing wrong?

thanks

this correct 6to4 address. 6to4 subnet on format 2002:ip4_hi:ip4_lo::/48. ip4_hi top 16 bits of ipv4 address, while ip4_lo low 16 bits of address.

for example, ipv4 address 1.2.3.4 gives 6to4 subnet 2002:0102:0304::/48.

see 6to4 address block allocation more details.

a different question whether address want? there other ways map ipv4 addresses ipv6 addresses. example, there ipv4-mapped ipv6 addresses, typically written ::ffff:1.2.3.4.

the address format need depends on going use for.


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