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We use debian / ubuntu clients and uses vpnc to connect to our on premise ASA now. Would vpnc work with (CSR) 1000V?
The CSR1000V in the Amazon Cloud is a fully functional version of the CSR1000V running 3.11 software. As such it supports all features that the CSR1000V supports including the following VPN features:
Here is a link for the configuration guide for IOS-XE EasyVPN configuration:
As well as some additional information about the CSR1000V:
Q&A for the CSR1000V
So assuming that the Ubunt vpnc client is connecting to your ASA with EasyVPN there should be no problem also connecting to a CSR1000V in the Amazon cloud.