invalid-spi-recovery crypto isakmp command worked well in the case of DMVPN

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• DMVPN with invalid SPI recovery / DPD

  Dear Experts,

  I'm evaluating a networks of average design company DMVPN Phase 2 scope, trying to optimize the time of receovery after a failure and restoration of a DMVPN counterpart.

  1. I just spent through a PDF of Cisco Live at a workshop of 2011 named "Advanced Concepts of DMVPN - BRK 4052".

  It is said (without further explanation) that the invalid SPI recovery feature is not useful with DMVPN.

  Can anyone explain, why?

  2 DMVPN involves the use of the Tunnel (TP) Protection. I read the reviews that say that you can not use Dead Peer Detection (DPD) as well as the TP.

  Unlike these reviews, Cisco DMVPN V1.1 design guide recommends a configuration container:

  ISAKMP crypto keepalive 10

  That means, I have to use DPD, but without "periodicals" KeepAlive? If so, could you explain?

  Thank you very much!

  Dear Sebastian,

  1 SPI recovery means essentially that the answering router must meet the same initiator VPN router if the SPI was invalid, the response of the intervener would be an 'invalid' error to the initiator VPN.

  Why it is not recommended for DMVPN?

  Well, according to the previous description of SPI, imagine if someone upsets your router with rogue applications! with the resumption of active SPI, it means that your router would need to respond to all messages which he received with the message "Invalid Error", which basically means--> attack (Denial of Service Attack) back--> high CPU processing on your router.

  http://www.Cisco.com/en/us/docs/iOS/12_3t/12_3t2/feature/guide/gt_ispir.html#wp1045200

  How is it that relates to DMVPN?

  Well! DMVPN is mainly deployed with large number of rays! and even if no one attacks you! your rays can attack you

  2. I don't think that having periodic KeepAlive is what we hear in the comments on demand or periodic KeepAlive is not really effect DMVPN.

  I don't know what are the comments you've read, but I think you can use DPD! There have been some incompatabilites filed for tunnel KeepAlive, but as far as I know, nothing major was filed against ISAKMP KeepAlive.

  HTH!

  AMatahen

• The speaker volume in the computer sound control mixer is up and works well with the speakers, but with headphones, I can hardly hear.

  Original title: the headphone volume

  How can I activate the volume for headphones? the speaker volume in the computer sound control mixer is up and works well with the speakers, but with the headdphones that I can barely hear

  Hello
   
  1. who is the operating system installed on the computer?
  2. What is the brand and model of headphones?
  3A this works much earlier?
  4. What is the brand and model of the sound card?
  5. have you ever tried to play the Audio using different media player applications and check?
  6. have you tried to connect the headset to another computer or phone and check if it works well?
   
  I suggest you follow these methods and check.
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  Tips for solving common audio problems
  http://Windows.Microsoft.com/en-us/Windows7/tips-for-fixing-common-sound-problems  
  
  You can also contact the manufacturer of headphones and check.
   
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  PS: This is my first question here so please excuse if you lack something to point or express properly.

  This issue is beyond the scope of this site (for consumers) and to be sure, you get the best (and fastest) reply, we have to ask either on Technet (for IT Pro) or MSDN (for developers)
  *
  http://social.technet.Microsoft.com/forums/en-us/home s/fr-U.S./Accueil
  http://social.msdn.Microsoft.com/Forum

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• Works well in the preview of Flash, but not when the server!

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