transparent udp proxy

[Hooman Fazaeli]

On 10/31/2014 5:30 PM, Mark Felder wrote:
> I'm not sure if this is what you're looking for, but perhaps the
> solution is in net/samplicator ?
>
>  From the project's website:
>
> This simple program listens for UDP datagrams on a network port, and
> sends copies of these datagrams on to a set of destinations. Optionally,
> it can perform sampling, i.e. rather than forwarding every packet,
> forward only 1 in N. Another option is that it can "spoof" the IP source
> address, so that the copies appear to come from the original source,
> rather than the relay. Currently only supports IPv4.
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Thanks. I do not thinks it provides what I am looking for.

I am not looking for an application performing a specific task, but a mechanism
to get the __original__ destination address and port of packets forwarded to a
local UDP proxy by ipfw fwd rules. As I figured it out until now, The original destination
address may be obtained by IP_RECVDSTADDR on 9.0+ (but not on 8.x and older versions) but
there seems to be no mechanism get the _original_ destination _port_ (Apart from this
missing mechanism, my proxy is functional and performs what it is intended to do).


-- 

Best regards.
Hooman Fazaeli