First, ​this is what worked at APRICOT Feb08.

Then, equipment requirements. This came out of discussions with CiscoPhil on the APRICOT experiences:

> You're using a 7200VXR at Apricot, which is more than what we 
> typically get at AfNOG.

15% CPU for about 10k simultaneous active translations, 30k will give 
about 50% CPU. Scale accordingly for lesser boxes. That VXR was the 1M 
pps variety. So a vanilla 2611 at 15kpps will do about 1k simultaneous 
at 90% CPU (at a guess). So if you can get something beefier, in the 
100kpps class, we should be fine as we'll be able to do about 6k 
simultaneous translations at 90% CPU (and this represents about 60 
simultaneous users).

> I don't want to use the kit routers
> as border routers so I'll need to ask Belhaj to see what he
> can come up with (or what we can steal from Steve),
> but it helps to know what hardware we'd need, and whether we
> can make a typical 2600/3600 work.

It will work. NAT-PT has been in IOS for at least 8 years now, if not 
longer, so it will be on pretty much everything built since then.

> So, what box would I need?

See what is offered, and I'll check. But aim for at least 2800, 3700, 
3800 series or higher. Old 7200 with NPE150 or NPE200 will do - newer 
will be faster. At a push a 4700 or 3640 will do.