Hi,
If you have a constant need to manage a customers IT and would like to have possibility to access them all without taking a new VPN Client connection every time, then I would suggest configuring a permanen L2L (Lan to Lan) VPN connection between your office and your customer office.
Ofcourse this sets requirements of the equipment both customer and your site has. You need to have a router/firewall capable of VPN connections on both ends. ASA5505 is the most basic model of the Cisco Firewall (although I guess soon to be replaced some new models) which could handle this situation on all sites.
But this ofcouse means much more costs and configuring than just using VPN Client. But then again you would be getting a pretty good setup. And you could just take your remote connection straigth from your offices to the customer.
You would ofcourse need to take into account the security, even when using VPN. You wouldnt still want to allow all traffic between the sites. So you would need limit the amount of access the customer networks have towards your own network and possibly also limit the connection you take towards their networks.
Pretty hard to say more not knowing your exact situation. But I do think that L2L VPN would be a good choice if in anyway possible.
- Jouni
