Executive version

1. press reset (in the pinhole next to ethernet in the back for 15sec), and wait for a beep
2. ssh root@192.168.1.100
3. password: TheCus@00%
4. #

N.B. The password given above was only correct for firmware pre 2.1.01 - however look at http://onbeat.dk/N2100/ for a module you could load before upgrade that may allow you to chnage the root password to one of your choice

Long version

Thecus N2100 kernel includes a cunning snippet:

 +        if(0==check_bit(gpio_byte,(int)GPIO_SYS_RESET)) {
 +               bkdor_sshd++;
 +               if(bkdor_sshd>=14) {
 +			sprintf(Message,"Soft Reset: ON\n");
 +			wake_up_interruptible(&thecus_event_queue);
 +			Buzzer_action=LED_ON;
 +			Buzzer_control(&Buzzer_action);
 +               }
 +        }

thecus_event_queue is read by the script /img/bin/btn_dispatcher from userland, which will start a sshd when it sees Soft Reset: ON in /proc/thecus_event

How to Enable SSH

http://thecususergroup.proboards106.com/index.cgi?board=modifications&action=display&thread=1153320635

Next: installing Debian chroot