Why no implicit route for traffic from IPSec-L2L tunnel?

In a hub-and-spoke IPSec environment, it is not difficult to implement routing by spoke to the hub.

But on the side of the hub of a tunnel, where the gateway of last resort for traffic by spoke it, it seems almost counterintuitive than the ACL instructions and even cryptographic doesn't implicitly create a route for the traffic of the station in the tunnel at the end (talk).  It could always be replaced with a static if necessary.

There is probably a good reason for this, but I can't think of it.  Or am I the only person who thinks it is strange... or maybe an opportunity to feature?

Hello

This feature exists and is called reverse road injection. The route is created dynamically (based on ACL Cryptography) and is only available when the SA is up.

http://www.Cisco.com/en/us/docs/iOS/12_3t/12_3t14/feature/guide/gt_rrie.html

HTH

Laurent.

Tags: Cisco Security

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    Crypto ipsec ikev1 transform-set ESP-3DES-SHA-TRANS mode transit
    Crypto ipsec transform-set ikev1 ESP-3DES-MD5-TRANS esp-3des esp-md5-hmac
    Crypto ipsec ikev1 transform-set ESP-3DES-MD5-TRANS mode transit
    Crypto ipsec transform-set ikev1 ESP-DES-SHA esp - esp-sha-hmac
    <--- more="" ---="">
                  
    Crypto ipsec transform-set ikev1 esp ESP-DES-MD5-esp-md5-hmac
    Crypto ipsec transform-set ikev1 ESP-DES-SHA-TRANS esp - esp-sha-hmac
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    Crypto ipsec ikev1 transform-set ESP-DES-MD5-TRANS mode transit
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    crypto CRYPTO - map 2 map corresponds to the address outside_cryptomap
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    enable dhcpd management
    !
    a basic threat threat detection
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    no statistical threat detection tcp-interception
    SSL encryption rc4-aes128-sha1 aes256-3des-sha1 sha1 sha1
    attributes of Group Policy DfltGrpPolicy
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    internal GroupPolicy1 group strategy
    attributes of Group Policy GroupPolicy1
    Ikev1 VPN-tunnel-Protocol
    username, password admin eY/fQXw7Ure8Qrz7 encrypted privilege 15
    username gmsadmin password HS/VyK0jtJ/PANQT encrypted privilege 15
    <--- more="" ---="">
                  
    tunnel-group MK SG type ipsec-l2l
    IPSec-attributes tunnel-group MK-to-SG
    IKEv1 pre-shared-key *.
    tunnel-group 160.83.172.8 type ipsec-l2l
    tunnel-group 160.83.172.8 General-attributes
    Group Policy - by default-GroupPolicy1
    IPSec-attributes tunnel-group 160.83.172.8
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    Good news, that VPN has been implemented!

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    Hello

    Add:

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    I install my RV180 to VPN to our headquarters Fortigate 60 C. It works really well

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    Hello

    Can someone offer me some advice on this please?

    I have attached a simple diagram of our EXTENSIVE referral network.

    Overview

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    I managed to get this working using IPP, but for some reason any VPN stay up all the time when we are not in a failover scenario. This causes the ASA added the table as a static route is the remote subnet in it and do not use the announced route of OSPF from the core network. This prevents the BO customers access to the Internet. If I remove the IPP on the VPN setting, ASA learns the route to the subnet via the WAN BO - resumes normal operation.

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    Paul

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    Let me know, if this can help.

    Thank you

    Rizwan James

  • Routing access to Internet through an IPSec VPN Tunnel

    Hello

    I installed a VPN IPSec tunnel for a friend's business. At his desk at home, I installed a Cisco SA520 and at it is remote from the site I have a Cisco RVS4000. The IPSec VPN tunnel works very well. The remote site, it can hit all of its workstations and peripheral. I configured the RVS4000 working in router mode as opposed to the bridge. In the Home Office subnet is 192.168.1.0/24 while the subnet to the remote site is 192.168.2.0/24. The SA520 is configured as Internet gateway for the headquarters to 192.168.1.1. The remote desktop has a gateway 192.168.2.1.

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    Hi William, the rvs4000 does not support the tunnel or esp transfer wild-card.

  • Unable to connect to Homegroup Windows 7 between the Modem to the PC and the Modem to the router for PC users.

    I want to talk about WIRED computers, do not speak of wireless.

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    A Modem can have only two ports, connect to the internet (Wide Area Network) and the second to a SINGLE local device. In most cases the internet Service Pwill provide with only an IP address so itself cannot connect to more than one at a time. In current solutions, it is very rare for a Modem to use. If as you say, you have several devices connected to this unit then he himself is a router but possibly with the Modem built in if you have ADSL ISP.

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    Remove the 3rd PC of the 2nd router and plug it into the direct 1 router, remove the router 2nd the 1st in order to free the port. 3 all PCs are now on the same local network and communicate both IPv4 and IPv6, and homegroup should work.

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  • Tunnel of RV042 V3 that routes all traffic to the VPN

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    I use Cisco Linksys RV-042 with V2 hardware to set up a VPN tunnel that route all traffic to the remote gateway (a Cisco ASA 5510). This configuration works very well, and I can access the local router and other resources to the central site.

    I'm doing the same thing with Cisco RV042 with version V3 of the material, but I can't access the local router until the VPN breaks down. I can ' ping, SNMP the local router, or access but I can access the central site. Very strange.

    Do you know what can I do to access the router local (for example, hardware V2) with connected VPN?

    Thank you

    Rafael

    Just a hunch, but in the remote network you agree with what the network and subnet?

    I've seen this symptom before.

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    It is traffic destined to the router on the 10.10.2.1 ip address is through the tunnel forward. So, for this purpose, you can only access the router LAN interface when the tunnel is out of service. I'm not sure why ping works but it does. I'm looking into this symptom on a different device, but the device has a similar graphical interface.

    I would like to know if you have a similar setup.

    Cisco Small Business Support Center

    Randy Manthey

    CCNA, CCNA - security

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