showing posts tagged with 'networking'
by lunarg on November 25th 2015, at 10:58

Resetting a HP 1810-24 or -24G to factory defaults is easy:

  1. With the switch powered on, using both ends of a paperclip (or two separate paperclips), press and hold down the Reset and Clear buttons.
  2. Release the Reset button, but keep the Clear button held down.
  3. When all three mode LEDs (Act, FDx, and Spd) begin to blink, release the Clear button as well. When the self-test completes, the switch will be reset to factory defaults. Its IP address will be obtained through DHCP, or if there's no DHCP, it will be set to The password will be blank.
by lunarg on November 7th 2015, at 15:43
To enable SSH on Dell Networking N-series (formerly known as Dell PowerConnect), you first have to generate the required private RSA and DSA keys. If you don't, you're met with a very secretive error message:

SSH could not be enabled.

To generate the keys, and configure and enable SSH, log on to the switch using the console cable or log on through Telnet:

Go into EXEC mode, then in CONFIG mode:


Generate both the RSA and DSA keys:

crypto key generate rsacrypto key generate dsa

Now, you can enable the SSH server:

ip ssh server

Optionally: you can also change the protocol and/or default listen port:

ip ssh protocol 2ip ssh port 22

Optionally: after enabling SSH, you c  ...
by lunarg on April 20th 2015, at 15:41

You can disable the page prompt "--More or (q)uit--" by entering the following command at the console:

terminal length 0

This disables the prompt, and allows you to do config dumps, or run show tech-support.

If you get an error about unrecognized command, your firmware is too old.

by lunarg on April 17th 2015, at 15:07

Dell Networking switches introduce a new port mode called switchport general. This type is a multi-purpose mode, combining access and trunk in one.

Access mode

The following gets written as:

switchport mode access
switchport access vlan 99
switchport mode general
switchport general allowed vlan add 99 untagged
switchport general pvid 99

Trunk mode

The following gets written as:

switchport mode trunk
switchport trunk allowed vlan add 99,100
switchport mode general
switchport general allowed vlan add 99,110 tagged
switchport general pvid 4095         (this is is the drop vlan)
by lunarg on March 9th 2015, at 11:15
You can easily reset the root password on linux-based VMWare appliances through the boot loader. For this to work, you need access to the console of the appliance (i.e. through vSphere (Web) Client), and needs to be performed during offline hours as the appliance has to be rebooted.

Reboot the appliance, and as soon as you see the GRUB boot loader, halt the automatic boot timer by hitting any key (I usually move the selection using the arrows).

Select the first entry, and press e, allowing you to type in some text. At the end of the line that starts with kernel, add the following text:


Do not remove any other text. Then press Enter to confirm.

Press b to continue the boot  ...
by lunarg on February 3rd 2015, at 10:24

Last year, around May, has changed their root certificates, causing Dynamic DNS using no longer to work properly. The error (Network Error) is displayed immediately after adding the account to your Sonicwall.

The easiest solution is to upgrade to the latest firmware:

  • For 5.8, this is at least;
  • For 5.9, this is anything after June 2014.

Dell Support also offers an alternative, although this only works with more recent 5.9 versions:

by lunarg on October 13th 2014, at 12:46
Installing a firmware upgrade on your Dell Force10 MXL IOM works similar (but slightly differently) than the other Force10 series. There are two things to upgrade: the IOM firmware and IOM operating system. The first has to be upgraded through CMC (not documented here), the second through the switch itself.

To upgrade FTOS, you need console access (can be SSH/Telnet) to the switch and an SCP/FTP/TFTP server.

If you have none of these, you can download tftp32/64. This is a light-weight TFTP-server which does not need to be installed and can be run as an application on any networked computer. Place the downloaded firmware (the BIN-file) in the same location as the tftp32/64 executable and st  ...
showing posts tagged with 'networking'