I was just tasked with this project - provide alternatives to VPN. I asked what this meant and it could be either different platforms than what we use now or totally different technologies.
We have about 1500 employees, 500 of which are field based/remote. Of the rest, about 500 connect at night, weekends, holidays, etc. Max online usage has been around 250 at a time with peaks during the day around 50. We're using IPSEC with 3DES to connect now. We're running Nortel Contivity's - 2600 at the main site, 1600 at another site, and 1010 at a Branch Office. Version is 4.86_160 and 4.65 client.
What's driving this whacky request is the business units suffering intermittent drops in their tunnel. It's primarily the broadband users and I suspect it's various issues with IPSEC/ISAKMP keepalives not getting through or MTU issues for DSL users.
I would appreciate hearing how you're set up and what issues you have with your VPN and what you would recommend for me. I also am open to other technologies such as RAS and SSL VPN.
I will split points between pertinent contributors.