I just tried tomato-ND-1.28.5x-099-SD-VPN.trx on my linksys wrt310n v1. The SSID on the physical interface works great. However, the virtual SSID with WPA/Tkip or WPA2/AES on the Virtual interface has problem with the DHCP. Client stuck at renew IP address for a very long time and eventually stops at limited connectivity. If I set the virtual SSID to OPEN (no security). The client can get an IP without any problem.
Hopefully the next Shibby build can fix this problem.