Category Archives: Hardware

Configuring SNMP Traps on D-Link Switches

I will give an example of setting up SNMP Traps sending on D-Link switches.
For example, I will take the switches D-Link DES-3200-x:

Create an SNMP password:

create snmp community public view CommunityView read_only

We indicate which host and with which password the traps should be sent:

create snmp host x.x.x.x v2c public

We indicate the change in the state of which ports to send traps:

config snmp link_traps ports 01-24 disable
config snmp link_traps ports 25-26 enable

Check the configuration of sending snmp traps with the command:

show snmp traps

Check the configuration of sending snmp traps on the status of ports with the command:

show snmp traps link_traps

At the end of the command, you can digitize port numbers.

See also my article:
Installing and using Net-SNMP

Block third-party DHCP servers on the Huawei Quidway S2300 (DHCP Snooping)

I will give an example of how on the Huawei Quidway S2300 switch (using the S2326TP-EI as an example) to allow receiving DHCP responses from the uplink port and prohibiting client responses.

Continue reading “Block third-party DHCP servers on the Huawei Quidway S2300 (DHCP Snooping)”

Configure IP Unnumbered on Cisco

On the test I will configure IP Unnumbered on Cisco Catalyst 6509E with firmware 12.2(33)SXJ7, on other switches the setup is similar.
IP Unnumbered is useful, for example, when it is necessary to divide a large network into several VLANs and use the same IP addresses and also to issue white IPs in any VLAN using one gateway.

Connect to the terminal device through the console, telnet or SSH.

Continue reading “Configure IP Unnumbered on Cisco”

D-Link DSR-150 router firmware upgrade

To flash the D-Link DSR-150 router, take the following necessary steps in steps:

1) Let’s look at the revision on the label under the router and download the new firmware from it from the official site http://www.dlink.ru/ru/products/9/1697_d.html

Firmware router not under the revision can lead to its failure.

2) Open the settings of the router by typing in the browser the address http://192.168.1.1 (maybe 192.168.0.1) and enter the standard login – admin, the password – admin.

3) In the opened interface at the top, open the “Tools” tab, on the left, select “Firmware“. On the page that opens, the current firmware version will be displayed, if it is older than the downloaded one, then click “Browse” and select the previously downloaded firmware file, then click “Upgrade” to start the process updates.

Wait until the update is complete, usually 2-5 minutes. At the end, the router will reboot.

Is done.