Problem with GRE

Hi all

Basically, I have a vpn between a branch and central, it works fine but sometimes the GRE tunnels are off and stops working vpn. With reset solved, but the problem persists sometimes from time to time the way... is not a problem of saturation, because little traffic through the help of routerAny will be welcomeRegards

Configure the gre with a keepalive tunnel.

Sent by Cisco Support technique iPad App

Tags: Cisco Security

Similar Questions

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    We have several sites that use of GRE Tunnels with card crypto for encryption.  To upgrade to the latest version of a UC-520 (15.1 (2) T4 or any version of this train) I get the following error: -.

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    I use this setup so I can choose exactly which traffic is encrypted (I do not encrypt voice for example).

    Thank you
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    It looks like from the 15.1 this configuration is no longer supported. Here's what the release notes:

    Error message appears when you try to apply the tunnel interface to a card encryption.

    Old behavior: Error Message is not displayed when you try to apply tunnel interface card encryption using the command card crypto (interface IPSec).

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    crypto map command (interface IPSec).

    http://www.Cisco.com/en/us/docs/iOS/15_1/release/notes/151TNEWF.html

    The order reference has the following information about the error message:

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    http://www.Cisco.com/en/us/docs/iOS/Security/command/reference/sec_c4.html#wp1078283

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    I have the following scenario to connect my main HQ with other directorates:

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    secure cryptographic card

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    Crypto card secure ipsec-isakmp 13
    the value of 172.18.x.x peer
    Set transform-set aes
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    destination 172.18.x.x tunnel
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    IP address 172.19.x.x 255.255.255.252

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    Crypto card secure ipsec-isakmp 13
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    In your current design, I can see HSRP used to provide evacuation route VPN HA outwards.  IPSec plan HA, HSRP is usually deployed when the Wan is attached Ethernet.  In this case, we can build the tunnel using the virtual address HSRP giving a permanent IP address.  The problem with your design, is that to reach the HSRP virtual IP address, you must cross a single hosted serial interface. If this interface is unsuccessful or if there is a problem in the path routed between cryptographic peer, you will never be able to reach the HSRP virtual IP address so the resulting solution will fail.

    If it is the topology we work with, so the only recommendations I can do is to incorporate IP SLAS and followed in your design.  For example, you may track the status of the interface the main router series.  If the interface fails, you could decrement the HSRP interface boot priority in order to force traffic to converge on the backup router path.  With star-ISAKMP KeepAlive configured on the routers in topology, routers should be able to recognize the failure and the timeout of the old SAs.  Because the RADIUS is configured with two counterparts, the router can negotiae new SAs with the backup router.  When the serial interface comes back online, you can have the main router anticipate waking after a delay.  To detect indirect failures on the transit route, you could use ICMP IP SLA and monitoring instead.  This design, however, will be properly tested for stability during the failover process.

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    You also have routing set by it.

    You don't need a GRE tunnel, nor do you need the road to tunnel if you want just IPsec tunnel.

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