D-Link – IT Blog

Firmware Update D-Link DES-3200 A1 / B1

Using the example, I will update the firmware on several switches, DES-3200-10, DES-3200-26, DES-3200-28.

How to update the firmware on the D-Link DES-3200 C1, see my article:
Firmware Update D-Link DES-3200 C1

Firmware Update D-Link DES-3528

Using an example, I will update the firmware of the D-Link DES-3528 switch.

Solving the problem with freezing DIR-300/NRU/B7 using firmware from Zyxel Keenetic Lite

I noticed on more than 10 DIR-300 / NRU / B7 routers that they hang periodically, the Internet disappears, and if the router is included in an unmanaged switch, then the DIR-300 / NRU / B7 also hangs it. All official firmware up to 1.4.8 did not solve the problem.

It was possible to solve the problem only with modified firmware from Zyxel Keenetic Lite.

Configuring the D-Link DIR-300NRU/B7 Router

As an example, we will take the D-Link DIR-300 NRUB7 router.

Restoring D-Link DIR-300NRU/B7 Router

I had to restore the D-Link DIR-300NRU/B7 on the inoperative router, which stopped working after turning off the power at the time of the firmware update. In fact, some other D-Link routers can be restored using the method.

D-Link DIR-300 Firmware Update

In the test I will update the firmware of the D-Link DIR-300 B5 v.1.2.94 router to 2.15.12.
In my case, after updating the firmware, the settings were reset to the factory settings and new functions were added, for example, when you select a Wi-Fi channel, you can see the noise levels of channels by other devices.

ACL Examples for D-Link Switches

In this article I will give some examples of blocking IP addresses, MAC addresses, DHCP packets from DHCP servers, etc.

Configuring SNMP Traps on Linux

Here is an example of installing SNMP and catching SNMP traps in Ubuntu Server.

How to catch broadcast flood on D-Link switches

I noticed once in one common network jumps in broadcast traffic, I was able to detect naturally quickly, since I had previously set up monitoring via graphs and triggers using Zabbix. I looked at the graphs of broadcast traffic from the ports of the main switch, from here it was clear where he started to go, and so we determined the chain to the client switch and port. In the Zabbix monitoring system, it is convenient to configure triggers that trigger when the limit of broadcast traffic is exceeded and report this on the screen, email to the administrator, etc.

Blocking multicast IP addresses on D-Link

To block multicast ip addresses I will use ACL. Using an example of multicast, IPTV is broadcast via D-Link DGS-3612G and suppose that some channels need to be blocked, for this we create the following ACL rules: