I've been tasked with migrating to the new ISP, which provides us with Cisco ME-3400E switch and /26 public subnet. I currently have 15 static NATs and 14 L-2-L VPN tunnels configured in ASA. Is there a way to configure additional Outside int on ASA and use it to migrate the existing VPN tunnels and static NATs? I'm trying to avoid downtime and hope to do it step by step. I'm thinking about adding additional Public switch, so I can also migrate vendor's router and VPN concentrator, which need to be in parallel to ASA. Assuming that this is possible I'd would like to do the following:
1.Configure and connect additional Outside Interface on ASA - public IP address and ACLs
2.Connect it to additional "Public switch", which would be configured with public IP address and connected to new ISP's Cisco ME-3400E.
3.Migrate my VPN tunnels and static NATs.
4.Migrate vendors equipment/VPN concentrator
5.Update my global NAT pool
6.Shut down old ISP
Is this possible? Any help is greatly appreciated.
Yes.This works. The steps you mentioned will work. Make sure to point any static routes on ASA to new outside (outside2) interface when moving the VPN tunnels. However, it is always recomended to make any production changes during the mainteanance window.
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