Большое спасибо за ответы, но у меня все равно не получается решить проблему.
Сделав сброс к заводским настройкам из web-интерфейса я ввожу следующие настройки:

И вот такие результаты я вижу на странице Status:

В ЛОГЕ находится следующая информация:
Jan 1 00:05:07 DHCP: Client send DISCOVER.
Jan 1 00:04:51 DHCP: Client send DISCOVER.
Jan 1 00:04:43 DHCP: Client send DISCOVER.
Jan 1 00:04:39 DHCP: Client send DISCOVER.
Jan 1 00:04:37 DHCP: Client send DISCOVER.
Jan 1 00:00:45 DHCP: Client send DISCOVER.
Jan 1 00:00:29 DHCP: Client send DISCOVER.
Jan 1 00:00:21 DHCP: Client send DISCOVER.
Jan 1 00:00:17 DHCP: Client send DISCOVER.
Jan 1 00:00:15 DHCP: Client send DISCOVER.
Jan 1 00:00:10 DHCP: Server sending ACK to 192.168.0.100. (Lease time = 86400)
Jan 1 00:00:10 DHCP: Server receive REQUEST from 00:26:.....
Jan 1 00:00:10 DHCP: Server sending OFFER of 192.168.0.100.
Jan 1 00:00:10 VPN (L2TP) Pass-Through enabled.
Jan 1 00:00:10 VPN (IPSec) Pass-Through enabled.
Jan 1 00:00:10 VPN (PPTP) Pass-Through enabled.
Jan 1 00:00:10 Domain blocking disabled.
Jan 1 00:00:10 URL blocking disabled.
Jan 1 00:00:09 MAC filter disabled.
Jan 1 00:00:08 DHCP: Server receive DISCOVER from 00:26:.....
Jan 1 00:00:08 DHCP: Server sending NAK to 00:26:.....
Jan 1 00:00:08 DHCP: Server receive REQUEST from 00:26:.....
Jan 1 00:00:04 System started.