You seem to be running every single possible feature of the router. Two hard drives, Time Machine, avahi, IPv6, NFS, Samba, three different types of VPN (including pptp!), etc. Your WAN DNS server address looks odd as well (192.168.2.254) but maybe that's normal for AT&T?
Most of the crashes in your log were from the IPsec VPN server, probably in response to port scanning. I'd start by trying to minimise the number of features enabled. In particular turn off the VPN servers. If you need VPN access just enable one on them.