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Archives for 2014

Dec 10, 2014 By Jared Heinrichs Leave a Comment

Remote Desktop Services RemoteApp logs in and then out

Does your RDS Remote Desktop Remote Services RemoteApp log in and then log out?

It seems like this update causes this issue. It’s a 2MB Critical Update from Microsoft that seems to break some servers.

KB3004394

Let me know if this resolves the RDS RemoteApp log in and then log out issues!

 

Filed Under: Windows 2008 R2

Oct 20, 2014 By Jared Heinrichs 1 Comment

GNS3 – Can’t connect to the external hypervisor on 127.0.0.1:7200

Are you running GNS3 or GNS3 Workbench and getting the error:

Can’t connect to the external hypervisor on 127.0.0.1:7200

Cant connect to the external hypervisor on 127-0-0-1-7200

After correctly setting up GNS3 Workbench I was getting that error when putting the router into work area.

To fix the error: Can’t connect to the external hypervisor on 127.0.0.1:7200 you must follow these steps:

Edit – IOS Images and Hypervisors [CTRL+SHIFT+I]

IOS images and Hypervisors

Make sure under “External Hypervisors” these settings. The default “blank” working directory doesn’t have enough permissions.

 

Go to “Edit – Preferences”

preferences

Make sure the binding is set to 127.0.0.1

Hypervisor 127-0-0-1

Move back to the Dynamips tab and make sure that the executable in the root path and that the working directory has enough permission to be written to. Click the “Test Settings” button last to make sure “Dynamips” can run.

Dynamips

You should see this:

successful

Go Back to IOS Images. We need to test AutoCalculation and Test the IOS settings.

Test IDLE PC and Test Settings

Filed Under: Uncategorized

Sep 27, 2014 By Jared Heinrichs Leave a Comment

CCNA–Cisco Etherchannel in plain English

Etherchannel is a Cisco term that allows a selection of ports to be grouped into a single virtual connection.

PROS

  1. Able to move more data than a single dedicated line.
  2. Provides Redundancy & Instantaneous failover if a line/port does down.
  3. The switch views the virtual connect essentially just like any other line. ie Protocols like STP and VTP work over it.

CONS

  1. More Ports used on the switch may have a great cost associated with it.
  2. 4x100Mb/sec lines means there is still only a max of 100Mb/sec for each individual conversation.
  3. All Ports have to be Identical (Ie. All FastEthernet or All Gigabit)
  4. All ports have to be configured the same (ie. Duplex, Speed etc)

Setting up Etherchannel

There are 3 main steps when setting up Etherchannel

  1. Specify the ports needed
  2. Specify Etherchannel Protocol. There are 2 main protocols:
    • a.) IEEE – LACP
    • b.) Cisco – PAgP
  3. Specify the Channel Group ID and Mode. This is done in the same command.
    • a.) Because you can have multiple Etherchannels per switch you will need to specify an ID for each one
    • b.) Depending on if you choose LACP or PAgP you will need to specify different modes.
  4. Turn the Ports into trunking mode
  5. Because Ports are in trunking mode please also turn on encapsulation ie. dot1q

Commands to setup Etherchannel

Here’s a screenshot from Live Cisco 2960 Switches being setup with Etherchannel:

Switch1

sw1-etherchannel

Switch2

sw2-etherchannel

What do the happens when something goes wrong with one of the lines with the etherchannel?

Switch2 – Unplug Port fa0/22, wait a few minutes and then plug the port back in:

sw2-unplug-port-22-then-plug-back-in

Let’s go over the last image.

  1. Unplug cable.
  2. Look at how fast the etherchannel reports the issue. It’s actually BEFORE the port actually goes down!
  3. Port goes down
  4. I hit <enter> a couple of times to break up the output.
  5. Plug the cable back into port fa0/22
  6. Interface comes back up
  7. Etherchannel rebuilds itself

Main commands to troubleshoot:

show etherchannel summary

  • Displays info on status of group, port-channel, protocol and port

sw2-show-etherchannel-summary

show etherchannel port-channel

  • Displays configured properties of port-channel, port state, protocol, port security, fast switchover and load share. It also lists the ports and timing info.

sw2-show-etherchannel-port-channel

show interface trunk

  • Displays info about all the trunk interfaces.

sw2-show-interface-trunk

Filed Under: Cisco Certification

Sep 27, 2014 By Jared Heinrichs 1 Comment

Command rejected: An interface whose trunk encapsulation is “Auto” can not be configured to “trunk” mode.

Are you getting the error: Command rejected: An interface whose trunk encapsulation is “Auto” can not be configured to “trunk” mode?

I first got this error when I was trying to setup a Cisco 3560. To be more precise

Filed Under: Cisco Certification

Aug 2, 2014 By Jared Heinrichs Leave a Comment

Behind the Scenes of Marvel’s Guardians of the Galaxy, in theaters this Friday!

Meet the Guardians and see the movie critics are calling the “Best Marvel Movie Ever.” Get tickets and see it in theaters this Friday.

 

Filed Under: Review, Uncategorized

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