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Forum Replies

  1. Hello Yuta

    Each of the commands you mentioned provide different features for the tunnel. The tunnel mode ipsec ipv4 command is the one that defines the mode for the tunnel. More specifically, this command enables IPSec encapsulation.

    The tunnel protection ip sec profile command is used to tie in the IPSec profile created earlier. This is where the encryption parameters are defined and applied.

    It is for this reason that when you removed the tunnel mode ipsec ipv4 command that the packets are still encrypted.

    It is possible to have tunnel mode gre which is th

    ... Continue reading in our forum

  2. Hi Laz,

    Thank you for the explanation.
    Please correct me if I am misunderstanding here. If the encapsulation is ipsec, then it means encrypting the original packets twice one with “tunel mode ipsec ipv4” and then “tunnel protection” command for second encryption while if we choose to use gre as encapsulation encryption is done on the whole gre and original packets?

    Also would you please teach me how to decide which encapsulation type we should be using?

    Regards,

    Yuta

  3. Hello Yuta

    IPSec functions in two modes. Tunnel mode and transport mode. Tunnel mode is when IPSec is the protocol that is used for tunneling and for encapsulation. This is the case when we configure the following:

    tunnel mode ipsec ipv4
    tunnel protection ipsec profile profile_name
    

    where the profile as shown in the lesson chooses to use the tunnel mode for IPSec.

    Whenever you choosetunnel mode ipsec ipv4 it is necessary to include the type of encapsulation mechanisms that you will use by indicating the tunnel protection command as well. These two commands t

    ... Continue reading in our forum

  4. Hi there,
    please, I need a clarification, is it true that we cannot use IPSec with DVTI/VTI and IPSec with crypto-map and access-lists in the same router? Let says we have one hub and two spokes topology, can we configure one spoke with IPSec using VTI and the other spoke with crypto-map and access-lists, then setting up the hub router to handle the two spokes, is it possible?
    Within waiting for your insights, I will try to lab this on GNS3.

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