The 10. is definitely coming from the FON. It is the only thing plugged into that port (there is no switch or router or anything between the FON and my laptop), and the laptop has a 192.186 address prior to plugging into the FON and subsequently gets changed to 10.42.43.1 by the FON.
I noticed that the wireless interface seems more stable on the 1.0 firmware version on my FON than the wired interface. From the install (using the instructions on your site), and making no modifications, I can see the wireless Jasager SSID, and connect to it wirelessly easily, but I can't ssh into it from the wireless interface (assuming ssh is disabled from the wireless side).
I tried to ssh into the wired side, to do a 'ps | grep dnsm' as you suggested, but ssh is problematic. Meaning, I think I was able to initially (since I changed the SSID), but can't seem to ssh from the wired side any longer for some reason (even though I didn't change anything but the SSID).
My symptoms at this point on the wired side are, I plug in a laptop, get the 10.42.43.1 IP, change it manually to a 192.168.1.x address, and then try to ping 192.168.1.1 (or 254), which I set the FON to, and it seems to lock up the FON, disabling both the wired and wireless interfaces. (At that point I can't even connect wirelessly any longer).
Perhaps it would be useful to walk through my installation method to see if I am doing something wrong:
1) I use the Kyocera cable connected to the JTAG port, powering up and breaking out of the boot up, to access redboot.
2) I then flash the firmware per the instructions on http://www.digininja.org/jasager/installation.php (for Firmware Users)
3) I got the1.0 firmware from http://www.digininja.org/jasager/download.php
4) This is where I noticed that the Jasager firmware is 2., not 2.1, and it seems very less stable than the method I used to install from scratch http://www.hak5.org/w/index.php/Fon_Jasager_Install_v2_1 and http://www.hak5.org/w/index.php/Fon_Jasager_Install.
5) With #4, I have the webif interface accessable, 2.1 Jasager firmware, and it seems more stable. (More, but still with the symptoms that I mentioned when I initially posted).
If you would like to offer suggestions on how to proceed, I'd be happy to try them out. At this point I'm considering going back to http://www.hak5.org/w/index.php/Fon_Jasager_Install_v2_1 and http://www.hak5.org/w/index.php/Fon_Jasager_Install to start back over at what, for me, is the most stable version I've seen so far.