[Jool-list] Jool double translation (src+dst) with siit?

[Alberto Leiva]

This seems like a typical 464XLAT configuration [0]. I'm not sure if I
understand the question. The NAT64 in router2 would translate the
source address; why do you think it wouldn't? It needs a functional
IPv4 source address to assemble a full IPv4 header.

router2 will use its own IPv4 address (or whatever you added into
pool4) to masquerade the 2001:db8:2::/96 address.

[0] https://jool.mx/en/464xlat.html

On Sun, Feb 2, 2020 at 3:24 PM Nico Schottelius
<nico.schottelius at ungleich.ch> wrote:
>
>
> Hello,
>
> is it conceptually possible with 1 jool instance to translate both the
> source and the destination address in one run or do I need to stack two
> jool instances?
>
> The problem I am trying to solve is as follows:
>
> [ IPv4 only network, i.e. 192.168.0.0/24 ]
> ---> [ Router1: IPv4 -> IPv6 ]
> ------> [ IPv6 only network, i.e. 2001:db8:1::/64 ]
> -----------> [ Router2 with IPv4 + IPv6 + NAT64 ]
>
> So router1 would do the following:
>
> - translate source address 192.168.0.0/24 => 2001:db8:2::/120 [jool
>   siit]
> - translate destination address X.Y.Z.A => 2001:db8:3::/96 [ nat64
>   prefix ]
>
> Then the packet would be routed to router2, which is connected to the
> real Internet and do the following:
>
> - See that 2001:db8:3::/96 is actually a nat64 prefix -> translate to
>   IPv4
> - Has NAT64 -> create a dynamic session entry for the source address in
>   2001:db8:2::/120
>
> router2 is as standard nat64 case.
>
> If I am not mistaken, router1 should be able to solve it with 2 eamt
> entries on the line of
>
>   "eamt": [
>     {
>       "ipv6 prefix": "2001:db8:2::/120",
>       "ipv4 prefix": "192.168.0.0/24"
>     {
>       "ipv6 prefix": "2001:db8:3::/96",
>       "ipv4 prefix": "0.0.0.0/0"
>     }
>   ]
>
> I'll try this out tomorrow, but does anything speak against src + dst
> translation this way?
>
> Best,
>
> Nico
>
>
> --
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