can anyone recommend me anything that supports SNMP-ALG as per RFC2692?

So far I only managed to find netfilter/iptables should support it, via
a long-time no-progress plugin. However, the plugin simply does not seem
to work (I've done loads of debugging, and as well I only managed to
find other people complaining about the same symptoms, with no hints on
how to resolve the issue).

I'll post a summary to the list so direct reply is preferable.