https://bugs.exim.org/show_bug.cgi?id=2163
Bug ID: 2163
Summary: RBL Checks an NAT64
Product: Exim
Version: 4.89
Hardware: All
OS: All
Status: NEW
Severity: wishlist
Priority: medium
Component: Unfiled
Assignee: nigel@???
Reporter: ruben@???
CC: exim-dev@???
hi,
as you will know IPv4 reaches end of life. There are some transition
mechanisms available to migrate to IPv6. One of them is NAT64 / SIIT (
https://tools.ietf.org/html/rfc6146,
https://tools.ietf.org/html/rfc7755)
If you see in the RFC7755 there is a translation from IPv4 to an IPv6 /96,
All this works also fine with exim. But you can't use the RBL checks anymore.
Cause the exim behind NAT64/ SIIT sees only the translatet ipv6. The
translation is:
64:ff9b::194.97.1.21 --> 64:ff9b::c261:115
If the user uses 64:ff9b::/96 for translation.
It would be nice If you could implement a config flag like:
behind_nat64 = true ( default false)
nat64_prefix = 64:ff9b::/96 (default 64:ff9b::/96 see
https://tools.ietf.org/html/rfc6052)
And if behind_nat64 = True translate the IPV6 to IPv4 for RBL Checks...
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