This article applies to the D-Link DSR-250N // 500N / 1000 / 1000N:
Symptom: You cannot access the router‘s web-configuration interface from a PC on your LAN.
1. Check the Ethernet connection between the PC and the D-Link router.
2. Ensure that your PC‘s IP address is on the same subnet as the router. If you are using the recommended addressing scheme, your PC‘s address should be in the range 192.168.10.2 to 192.168.10.254.
3. Check your PC‘s IP address. If the PC cannot reach a DHCP server, some versions of Windows and Mac OS generate and assign an IP address. These auto-generated addresses are in the range 169.254.x.x. If your IP address is in this range, check the connection from the PC to the firewall and reboot your PC.
4. If your IP address has changed and you don‘t know what it is, reset the router configuration to factory defaults (this sets the firewall‘s IP address to 192.168.10.1).router‘s
5. If you do not want to reset to factory default settings and lose your configuration, reboot the router and use a packet sniffer (such as Ethereal™) to capture packets sent during the reboot. Look at the Address Resolution Protocol (ARP) packets to locate the router‘s LAN interface address.
7. Ensure that you are using the correct login information. The factory default login name is admin and the password is password. Ensure that CAPS LOCK is off when entering this information.
Symptom: D-Link Router does not save configuration changes.
1. When entering configuration settings, click Apply before moving to another menu or tab; otherwise your changes are lost.
2. Click Refresh or Reload in the browser. Your changes may have been made, but the browser may be caching the old configuration.
Symptom: Router cannot access the Internet.
Possible cause: If you use dynamic IP addresses, your router may not have requested an IP address from the ISP.
1. Launch your browser and go to an external site such as www.google.com.
2. Access the firewall‘s configuration main menu at http://192.168.10.1.
3. Select Monitoring > Router Status.
4. Ensure that an IP address is shown for the WAN port. If 0.0.0.0 is shown, your firewall has not obtained an IP address from your ISP. See the next symptom.
Symptom: Router cannot obtain an IP address from the ISP.
1. Turn off power to the cable or DSL modem.
2. Turn off the router.
3. Wait 5 minutes, and then reapply power to the cable or DSL modem.
4. When the modem LEDs indicate that it has resynchronized with the ISP, reapply power to the router. If the router still cannot obtain an ISP address, see the next symptom.
Symptom: Router still cannot obtain an IP address from the ISP.
1. Ask your ISP if it requires a login program — PPP over Ethernet (PPPoE) or some other type of login.
2. If yes, verify that your configured login name and password are correct.
3. Ask your ISP if it checks for your PC’s hostname.
4. If yes, select Network Configuration > WAN Settings > Ethernet ISP Settings and set the account name to the PC hostname of your ISP account.
5. Ask your ISP if it allows only one Ethernet MAC address to connect to the Internet, and therefore checks for your PC‘s MAC address.
6. If yes, inform your ISP that you have bought a new network device, and ask them to use the firewall‘s MAC address.
7. Alternatively, select Network Configuration > WAN Settings > Ethernet ISP Settings and configure your router to spoof your PC‘s MAC address.
Symptom: Router can obtain an IP address, but PC is unable to load Internet pages.
1. Ask your ISP for the addresses of its designated Domain Name System (DNS) servers. Configure your PC to recognize those addresses. For details, see your operating system documentation.
2. On your PC, configure the router to be its TCP/IP gateway.