I apologize,

I didn't realize that I forgot to mention the IOS release.

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I would like to have a Cisco 4506 with Supervisor IV or V (and the IOS with encr features "S4KL3EK91-12220EW")
acting as LNS for IPsec over L2TP and L2TP over IPsec tunnels. They come from 2 different
providers who collect all the traffic coming from road warriors and forward it to my company network.
Do you think that both the IOS and the Supervisor(s) are adequate enough?

TIA Alex.