Model : TD-W9970

Hardware Version : TD-W9970 v1 00000001

Firmware Version : 0.9.1 2.9 v0025.0 Build 160812 Rel.32537n

ISP :

On my TD-W9970, I have the latest firmware, pre-installed from new.

Has anyone successfully set up & tested the VPN security of this TD-W9970 modem / router, if so,

1) How secure is the VPN, compared to installed versions of VPN on your PC / Devices.
1a) Can the VPN be used in conjunction with other VPN services / programs etc, IE: Avast SecureLineVPN

2) Can the connected clients be named (My ISP's cheaper entry level has got this facility)
3) Can the lease time be set to permanent.
4) What are the individual options 241 through 245, in the DHCP Condition Pool & what does each option do.
6) Can the MTU be changed, if so how.
7) How can I stop the Status page from auto refreshing every few seconds

TIA