change in Dynamics car for access mode will disable DTP effectively?

Hi all

"n a switch basis spoofing attack, the attacker takes advantage of the fact that the default configuration of the way of the switch is dynamic auto.". The network attacker sets up a system to spoof himself like a switch. This theft requires that the network attacker capable of emulating 802. 1 q and DTP messages. By encouraging a switch in thinking that another switch is trying to form a trunk, an attacker can gain access to all the VLANS allowed on the trunk port. »

My question is. East-configuration of a dynamic to access the port DTP stop auto port? Or should be still the switchport nonegotiate command to run to the port in question?

EDIT:

  • switchport nonegotiate- prevents the interface generating DTP frames. You can only use this command when the interface switchport mode access or trunk. You must manually configure the neighboring interface such as a network interface to establish a trunk link.

I think that it answers my question, but can someone please confirm

Thank you and best regards

Adam

Hi Adam, Mark,.

Let me join you.

As far as I know, a port set to the static access mode was disabled by default DTP. Switchport nonegotiate on a static port using access is not harmful but really does not do anything, like DTP would have been disabled in any case.

See the following output. I have two ports, a static access a single static trunk. In the output of the show interfaces switchport , the access port said "negotiation of Trunking: Off" (which means DTC) while the trunk port reports this feature on. When I disable DTP on the trunk by using switchport nonegotiate, the trunk reported negotiating trunking as well as off, identical to what access port has had all the time:

HQ(config)# do show run int fa0/10Building configuration...

Current configuration : 58 bytes!interface FastEthernet0/10 switchport mode accessend

HQ(config)# do show run int fa0/11Building configuration...

Current configuration : 95 bytes!interface FastEthernet0/11 switchport trunk encapsulation dot1q switchport mode trunkend

HQ(config)# do show int fa0/10 switchportName: Fa0/10Switchport: EnabledAdministrative Mode: static accessOperational Mode: downAdministrative Trunking Encapsulation: negotiateNegotiation of Trunking: Off[ ... cut ... ]

HQ(config)# do show int fa0/11 switchportName: Fa0/11Switchport: EnabledAdministrative Mode: trunkOperational Mode: downAdministrative Trunking Encapsulation: dot1qNegotiation of Trunking: On[ ... cut ... ]

HQ(config)# int fa0/11HQ(config-if)# switchport nonegotiateHQ(config-if)# do show run int fa0/11Building configuration...

Current configuration : 119 bytes!interface FastEthernet0/11 switchport trunk encapsulation dot1q switchport mode trunk switchport nonegotiateend

HQ(config-if)# do show int fa0/11 switchportName: Fa0/11Switchport: EnabledAdministrative Mode: trunkOperational Mode: downAdministrative Trunking Encapsulation: dot1qNegotiation of Trunking: Off[ ... cut ... ]

Personally, I do not believe that an access port longer listening DTP frames. Yes, it can receive (it is connected to send link partner or not these images, right?) but reject it immediately.

Even if an intruder connects to a switch configured as an access port port it doesn't really matter because even if the neighboring interface is set to dynamic auto / desirable Dynamics / trunk it will end up as an access port.


This is true but an attacker wouldn't be using an ordinary Cisco switch that is well-behaved. The attacker would use a PC and a DTP message injector tool to try to force the other port to become a trunk, regardless of what is the other port's response. Of course, if the port at the other end is a static access port, the attacker is out of luck.
Best regards,Peter

Tags: Cisco Network

Similar Questions

  • How to change the constant value for the property node "Disabled"?

    Hi all

    I enclose one vi example of what I'm willing to do. It happens during the event for "left selectorrogrammed 1: changing values.»

    Basically, I created a property to a Boolean LED control node. Once clicked, I'm eager to turn it off so that the user cannot change the value (I have a reset all button for use on that).

    I created the node property for this control for disabled people.  When I'm in the block diagram, I change to write mode.

    I rt clicked on it and said: ' create constant ", he does.  However, the constant comes each time as "Enabled". I tried clicking on this constant and looking through all of that property, but I can't find a way to scroll the values or set the value of this constant to "Enabled" to "disabled."

    I see where you can change the elements of this constant... but I guess there is a way to switch this constant to the value you want... any suggestions?

    Thanks in advance,

    Cayenne

    To change a constant value, your cursor must be in the mode 'finger '.

    You can select this option in holding down the SHIFT key and right-click on the diagram - then select the finger.

    Another way is to put the automatic selection of tools:

    Tools > Options > environment > lock automatic selection of tools

    With this option, LabVIEW will choose the tools for you.

    Play with him a bit to see how it works.

    Steve

  • Can I do a fill for text that will give the effect of having a STROKE inside?

    I have included a photo to illustrate the kind of what I want and what I tried which is wrong.

    Basically, I'm trying to find a way to have multiple lines of color on my editable text using a custom fill. The main reason I'm keen it is to reach a stroke inside, which cannot be done on the text, without him be described.

    I tried to make a sample of color with two colors side to side and then by filling the text with it, but as you can see on the photo that was WRONG.

    I made a text to show sort of what I'm trying to achieve, but not the way I want to do.

    I found this post: http://forums.Adobe.com/message/1283239#1283239 who can achieve the same kind, but he is not done with fillings.http://img150.imageshack.us/img150/139/81698984.gif

    I see where you were going there but fill patterns do not operate in this way.  You're just a model, you do not have an attribute.

    To get a line inside your text, as described above, look at the appearance Panel.  It will allow you to add outlines and funding, reorganize in the stack of the object and apply effects to them individually (as well as for the whole of the object.)

    What you need to watch adds an extra line and then to get it within the limits of your type, use effect-> path-> path offset to give it a negative offset which is 1/2 of line width is.

  • How to change shortcuts for blend modes?

    Hello. I would like to change the default hotkeys for blending modes(brush):

    Default shortcuts in Adobe Photoshop

    but I can't find one any of them listed anywhere in the customization window shortcut. Is it possible to customize them all?
    And if so, I am able to assign a simple shortcut (F5, F6...)?

    Any help is appreciated!

    I'm sure they're hard wires, and you wouldn't be able to use the unique key without modifier anyway.  I expect that you realize that the blending mode shortcuts are context sensitive?  If you have a tool that uses brushes, blending mode shortcuts affect the blending mode of the brush.  Otherwise, they affect the layer.

    Have you considered using a keyboard or mouse game?  Logitech gaming keyboards have a number of app sensitive "G - keys" you can program with anything a shortcut to a block of text.  It is very easy to use a set of keys to release of Photoshop shortcuts with a push.  The keyboard below has 12 keys with banks of memory game three, so 36 options.  I use mine for workspaces, perform actions, turn Lee Nezumi on and off etc.   I also use it for Firefox and conclude these discussions of the forum long links with a single touch.

  • change the time zone for email marketing

    We have an ongoing email marketing campaign, but our problem is that the zone for the site is set to GMT + 1. Where can I change to GMT + 10. I can't locate it.

    Thank you!

    Hi Mariano,

    Within the partner (http://www.businesscatalyst.com/Admin/Index.aspx?to=PartnerPortal) Portal, go to the sites my site > [select your site by clicking on the site name link], then the option to change the time zone for your site will be possible by clicking on [edit] next to 'Zone' under the heading 'Détails': http://screencast.com/t/dyCK9zSm

  • My Abobe photoshop 4.0 is not compatible with my Windows 7 a mild wear. It was, but for some reason any won't work now. I thought it was time to try a new version of photoshop and somehow ended up with a cloud, and apparently will have to pay for access t

    My Abobe photoshop 4.0 is not compatible with my Windows 7 a mild wear. It was, but for some reason any won't work now. I thought it was time to try a new version of photoshop and some sort finished with a cloud, and apparently will have to pay for access to Photoshop elements, which is everything I wanted in the first place. Is there a way I can get out of this oblogation to $120.00 and go to Staples and buy Photoshop elements 14?

    You may have to wait until Monday because of the long holiday weekend in the United States

    Chat/phone: Mon - Fri 05:00-19:00 (US Pacific Time)<=== note="" days="" and="">

    Cancel https://helpx.adobe.com/creative-cloud/help/cancel-membership.html

    -or https://helpx.adobe.com/contact.html?step=ZNA_account-payment-orders_stillNeedHelp

    > finished with a cloud and apparently will have to pay to access Photoshop elements

    I don't know what you bought, but Photoshop Elements only not part of the cloud

    Also, to install or run version 4 with Win7, did you do a RIGHT click on the program and select a compatibility mode from the option list?

  • I can't load my iTunes to my iphone 5 s.  When I plug it to my computer for access to, I get a message that says: I need a newer version of Itunes.  I go on the website, I download but nothing changes

    I can't load my iTunes to my iphone 5 s.  When I plug it to my computer for access to, I get a message that says: I need a newer version of Itunes.  I go on the website, I download but nothing changes

    What is the number of current version of iTunes you have on the computer? What computer OS do you use? If Windows, what version, so OS X, what version number?

  • Travel regions of Australia to New Zealand, which does not have the licenses for TV shows, will be my TV shows that I bought in Australia removed once I have change of regions in New Zealand?

    Travel regions of Australia to New Zealand, which does not have the licenses for TV shows, will be my TV shows that I bought in Australia removed once I have change of regions in New Zealand?

    N ° save them anyway.

    (138403)

  • PowerConnect 3548 - change port access mode?

    I'm having a problem with our 3548 P PowerConnect switches.  I guess it's just a procedure, I'm not aware, so I hope I can get help.

    It was necessary to temporarily move several ports to general mode to add access to a VLAN individual.  Right now, I would like to remove this VLAN and only have ports of the switch in question on VLAN 1.  I get a (not unexpected) error when trying to add ports to VLAN 1 (because it is not created by the user, the default VLAN), I tried to simply remove the VLAN ports and switch back them to General.  When I do, I get the following message:

    EXX port: Port does not belong to VLAN PVID as not tagged.

    What command sequence should I return the ports to access the mode and just make sure they're on the VLAN 1?  I guess I should do something about port traffic to not tagged or delete the PVID before returning to the access mode.

    I think I fixed the problem.  If I set the VLAN existing as non-tagged, i.e.:

    "switchport vlan allowed general access Add VLAN unidentified".

    This removes the image of marking and allows me to go back to access the mode on the switchport.   Yet to get used to the command structure; Thank you for putting up with my questions.

  • Sleep mode will not work after sleep said she sleeps for 2 seconds then the computer boots back on its own.

    Original title: "sleep" mode

    Sleep mode will not work after sleep said she sleeps for 2 seconds then the computer boots back on its own

    Hello

    See if this information helps you, Vista and 7 work the same:

    "How to restore the default power Plan settings in Vista"

    http://www.Vistax64.com/tutorials/198047-power-plan-restore-default-settings.html

    "How to solve a problem of Mode Vista or Windows 7 sleep"

    http://www.Vistax64.com/tutorials/63567-power-options-sleep-mode-problems.html

    See you soon.

  • HP Deskjet 1000 printer - just changed the black cartridge for the first time and now it will only print first half of the page. Can anyone help

    HP Deskjet 1000 printer - just changed the black cartridge for the first time and now it will only print first half of the page.  Can anyone help

    Hello Gloria,.

    I ask you to execute methods in the following link and check if the problem is resolved.

    Solve printer problems

    You can also contact the manufacturer to find out how to clean the print head.

    http://h10025.www1.HP.com/ewfrf/wc/siteHome?cc=us&LC=en

    Please get back to us with the State of the question.

  • Impossible to change the credit card for future payments. System will not change. [was: Director of the CC company]

    We must CHANGE our credit card for future payments and it does not change it on the line.

    This is an open forum, not Adobe support... Click below to contact Adobe staff for help

    While the forums are open 24/7 you can't contact Adobe support at any time

    Chat support: Mon - Fri 05:00-19:00 (US Pacific Time)<=== note="" days="" and="">

    Don't forget to stay signed with your Adobe ID before accessing the link below

    Creative cloud support (all creative cloud customer service problems)

    http://helpx.Adobe.com/x-productkb/global/service-CCM.html

  • Just changed my account information for payment, but payment results in a week, enough time for the new payment will be held for the new account?

    Just changed my account information for payment, but payment results in a week, enough time for the new payment will be held for the new account?

    HI Lucas,.

    I see that you have tried to change the billing details, but they were not properly updated.

    Please get in touch with the customer: -.

    Contact the customer service

  • I have adobe photoshop elements 9. I changed Windows 8.1 for windows 10. Now it doesn't work. When I trty to reinstall the software, windows will uninstall it. I habe no icon on the desktop to start the program. For this purpose I can't use it. What I hav

    I have adobe photoshop elements 9. I changed Windows 8.1 for windows 10. Now it doesn't work. When I trty to reinstall the software, windows will uninstall it. I habe no icon on the desktop to start the program. For this purpose I can't use it. What should I do? Thanks for your help. Wolf-Eberhard

    Check your installed programs and so PES 9 is listed, uninstall it by using uninstall.

    Then clean by http://www.adobe.com/support/contact/cscleanertool.html

    Restart your computer, and then reinstall pse 9.

  • ENVY 15: Turn off Adaptive display for ca mode

    Hello

    I'm in the curiosity of how I can turn off Adaptive brightness for the external mode display.

    http://i.imgur.com/nnDnd9Y.jpg

    I already turned off in Power Options in Control Panel. Initially, it wasn't only to turn off Adaptive brightness so I also disabled display Power Saving Technology for battery operation of the Intel Graphics Control Panel.

    It works like a charm for Adaptive functioning on battery power but display is always active when the external power and I couldn't find an option to turn off in Intel Graphics Control Panel, there is no display of techniques for saving power for external power.

    http://i.imgur.com/WtLe6kB.jpg

    So, how can I stop the Adaptive brightness for current alternative before going blind in the sudden brightness changes when I am plugged into the wall?

    Any help is appreciated.

    Thank you!

    Hi @yldzanl ,

    Thank you for visiting the Forums HP's Support and welcome. I looked in your question about your HP ENVY 15 laptop and wanted to turn down the brightness in AC mode. On your first page it shows you in editing parameters. You will notice that the brightness level, one for battery mode and the other for the AC adapter / CC, they are not the same.

    Change this to be the same for the battery and save the settings.

    Thank you should take care of it.

    Thank you.

Maybe you are looking for

  • If I move to a new folder, why it redownload all my emails

    I have eight email accounts in Thunderbird set up as IMAP. It was to find work. Tonight, I copied e-mails to a flash as a backup drive. I picked a bunch of e-mails, right click and used the selection "save under". Now every time I have called TB or s

  • Satellite M30 and new driver nVidia - after the awakening of the screen stays off

    I have Toshiba Satellite M30. Recently, I installed the new nVidia 9.1.3.1 driver (summer 2006) and after that, I started to encounter problems with wakes my notebook of booth mode and a problem with the power of the monitor. If computer sleeps or it

  • LaserJet 1536dnf MFP: HP Laserjet 1536dnf MFP

    It's that my scanner no longer records in JPEG format only PDF. Instead of 1 3-page document, I have now 3 images/documents one per page. When I tried o reload the software driver to retrieve this feature downloads failed. Need help with PDF function

  • Marquee Screensaver - it can oscillate?

    Looking for the oscillation feature that was available in the screen saver scrolling text? Can be obtained somehow for XP SP2?

  • Support Android Studio?

    Is there a Studio Android plugin in the works? It is in beta right now, but seems to be where android development.