Re: been a while...what happened to NFC_ALTERED?

[Philip Craig <philipc@snapgear.com>]

Horton, Dave wrote:
> This is all in the context of a single-purpose, specialized server that
> I build which does a very specific packet forwarding task.  I control
> the whole server (no other software needs to run on it) so hopefully I
> can somewhat control interactions. Regardless of the fact that it is
> non-standard, it does what I need and I need to somehow create that same
> functionality under 2.6, if possible.  Do you think I should be looking
> at some sort of alternative approach?  The simplest way to describe what
> I need to do is that I need to receive UDP packets on a specified set of
> ports and send them to a specified remote address:port after changing
> the source ip address:port to my local address and a specified port.

Standard nat rules can do that:
iptables -t nat -A PREROUTING -p udp --dport start:end -j DNAT --to-destination newdest:newdestport
iptables -t nat -A POSTROUTING -p udp -d newdest --dport newdestport -j SNAT --to-source newsrc:newsrcport