OK, I have tried to beat this VPN problem for the better part of a year now. In the start of 2013, I had L2TP with PSK working with our chrome books (I use a sonicwall TZ215). We don't commonly use chromebooks, mostly for demos to customers. Licensing on the sonicwall was kind restrictive and it could only handle 25 users without me changing hardware. Now, none of my chromebooks will connect to the Sonicwall, not that I want them to anyways (only got 7 users). I setup a PPTP RAS server, but found that chromebooks don't use it. I tried an OpenVPN solution, but couldn't do DHCP passthrough (had to do NAT - and it wouldn't work with our SIP softphones). I contracted a Cisco CP(lots of designations), and purchased ASA 5512 with 250 IPSEC licenses, but we still cant get it to connect. The hardware (ASA) isn't really mine yet, since they couldn't finish the SoW, so I am open to getting something else. I need to know, what the professionals use to be able to VPN with chromebooks. I need something that sits as an edge device, and talks directly into my voice subnet as we use a SIP softphone, which needs to be able to connect to the PBX on the same subnet.
Thanks in advance,