I just got a TC8305C from Comcast and have not had any problems with my VPN into work using "Juniper Network Connect". Since my work VPN assigns addresses in the 10.0.0.0 network address range, and the TC8305C DHCP server also assigns addresses in this range, I did what I've always done with personal routers - change the IP addresses used by the gateway. I logged into the gateway itself at 10.0.0.1 and changed its default address from that to 172.23.1.1 netmask 255.255.255.0. Rebooted the gateway and everybody's happy. Of course, you may have to release/renew any addresses your other home devices have so they get a new one from the gateway's DHCP server.
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