Surprising: Junk DSL Modem causes issuses.
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I recently forcefully upgraded from pfSsense 2.0.0 or 2.0.1 to 2.0.2 after a hard disk failure. I was able to recover the /cf/config/config.xml file and load it on a new install without any issues.
However, now I notice that the OpenVPN traffic is very slow and upon a more careful inspection realized that the OpenVPN client is not respecting the interface setting. The interface is set as WAN, but the OpenVPN traffic is instead going through OPT1. When I unplug/disable OPT1 the OpenVPN connection goes down. I've tried to set the interface to LAN where again the traffic should go through WAN, however it continues to always go through OPT1.
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So the issue is this ##@(# DSL modem. Because in pfSense 1.2.3 only "WAN" interface could be PPPoE, the modem was configured for PPPoE. But in this mode the DSL modem assigns the IP as a /8 to pfSense! So since both IP address (everything is dynamic) happen to start with 198. there was a conflict. After configuring the PPPoE on pfSense the subnet mask is 255.255.255.255 and there's no more conflict.
:'(