Just installed dd-wrt on my router even though the dd-wrt wiki says it's not yet officially supported. I decided to go for it because the chipset is a Broadcom BCMB83A which is a supported chipset. So far so good, the compatibility with freeDNS works flawlessly however I'm not having much luck getting my VPN working with it yet. I can still connect manually via network connections however no luck with getting it working as a connection type from dd-wrt. I'm sure I'm missing something that I'll figure out some other time lol.
P.S. Anyone looking to use VPN over PPTP should be aware that the default security settings in dd-wrt automatically blocks all PPTP connections. You will have to go to the security tab ->VPN Passthrough and enable PPTP Passthrough to make it work.