@henningw - I am not sure how to deal correctly in this case. But I would
rather consider it a natted source is if is reserved for special purposes, or,
in other words, not allocated for direct IP routing over Internet.
`192.0.0.0/29`, which is subset of `192.0.0.0/24`, is allocated for dual-stack
lite, so it is considered a natted address.
Even such address it is supposed not be used, apparently it is because @zeusca
got traffic with headers using an IP from the range. Could be a misconfigured
router or network, but if the traffic is from residential users, it can be hard
to ask them to fix it. Without treating it as nat, calls will fail to connect
properly.
Maybe an option is to add a modparam to control if one wants to match also
against "reserved ranges of addresses", besides what is listed now in the array
`nets_1918` inside nathelper module.
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