[ale] Simple iptables example wanted

[mhirsch at nubridges.com (Michael D. Hirsch)]

I'm trying to lock down a box.  I want to let traffic in on port 22 from 
any host, and nothing else.  I want to let out traffic on port 22 and dns, 
nothing else (which means that DNS replies have to also be allowed).

Anyone have a simple iptables config that would do this?   Or a pointer to 
a site with recipies?  I know it is simple, but I don't feel comfortable 
with my limited knowledge.

Thanks,

Michael
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