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.

Installing UNMS (Ubiquiti Network Management System)

UNMS (Ubiquiti Network Management System) – EdgeMAX®, EdgeSwitch®, airMAX®, UFiber device management system, which includes software updates, configuration backup, real-time performance graphs, notifications, device location maps, etc.

For example, I will install UNMS on Ubuntu Server 18.04 64bit.

First, install the necessary components:

sudo apt-get update
sudo apt-get install curl sudo bash netcat

Download the installation script from the official site to the temporary directory:

curl -fsSL https://unms.com/install > /tmp/unms_inst.sh

Run the downloaded script:

sudo bash /tmp/unms_inst.sh

If it is necessary to change the web ports during the installation:

sudo bash /tmp/unms_inst.sh --http-port 8080 --https-port 8443

By default, UNMS uses Let’s Encrypt when creating SSL certificates for your domain and saves them in /home/unms/data/cert/live.
If you want to use your SSL certificates, then during installation, for example, we specify (UNMS should have read rights in ssl-cert-dir):

sudo bash /tmp/unms_inst.sh --http-port 8080 --https-port 8443 --ssl-cert-dir /etc/certificates --ssl-cert fullchain.pem --ssl-cert-key privkey.pem

Configure Loop Protect in RouterOS (MikroTik)

Finally, starting with the version of RouterOS v6.37 and higher, protection against loops has appeared.
Loop Protect can be enabled on ethernet, vlan, eoip, eoipv6 interfaces.
Via WEB and Winbox on the interface settings page, opening the Interfaces menu.

Through the CLI, you need to go to the required submenu:

/interface ethernet
/interface vlan
/interface eoip
/interface eoipv6

Continue reading “Configure Loop Protect in RouterOS (MikroTik)”

HP LaserJet P2055dn Firmware Update

I noticed once that the HP LaserJet P2055dn printer began to print for a long time, there were long pauses between printing, while there were no problems with the network and the size of the printed files was small.

Going to the IP-address through the browser in the printer’s web interface in the menu “Status” – “Device Configuration” you can see the version of the current firmware (firmware), it should be older than the downloaded one.

Let’s download the new firmware from the official site
https://support.hp.com/us-en/drivers/selfservice/HP-LaserJet-P2000-Printer-series/3662052/model/3662058

Run the downloaded file, select the printer in the window that opens (it should be turned on) and click “Send Firmware” to start the firmware update process. Wait for the firmware update to complete.

This completes the update process. By the way, after the update, the problem with the delay in printing disappeared.