Unlikely VPN configuration

Hello

one of our partners, had asked us a strange VPN configuration. I'm not a specialist of the ASA and I want to assure you that it is really impossible.

We already have a VPN tunnel to the TOP. For example:

Peer1: 1.1.1.1/32 (my company)

Peer2: 2.2.2.2/32 (partner)

EncryptionDomain1: 10.10.10.10/32 (our field of encryption)

EncryptionDomain2: 20.20.20.20/24 (field of the partner encryption)

Thus, the partner we asked to install a second tunnel with exactly the same configuration. (Homologous domain and encryptio).

I don't think it is possible, for the reason of the match seemingly obvious to access list. In this way, I think that the ASA will get confused on which traffic corresponds to which access to the tunnel to the circulation list. It's quite a superposition of access list.

Am I wrong?

There might be an ASA feature that makes this possible?

Best regards

Fabiano Martins

Hi, Fabiano,.

As you rightly pointed out, it is not possible to create 2 tunnels for the same source and destination, between the same two peers.

As a single card encryption can be applied to an interface, the different tunnels that put an end to this topic are configured with line numbers.

When traffic is matched with the card encryption, for that, a descendant of the correspondence. And when two tunnels with the same crypto-list access are configured, then always match the first condition in the card encryption, and so the second tunnel will never come to the top.

The most interesting question here would be, as to why your client wishes to set up such a facility.

He may be trying to achieve something that can be done without the need for the two tunnels.

-Shrikant

P.S.: Please check the question as answered, if it has been resolved. Note the useful messages. Thank you.

Tags: Cisco Security

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    #pkts decaps: 49, #pkts decrypt: 49, #pkts check: 49
    compressed #pkts: 0, unzipped #pkts: 0
    #pkts uncompressed: 50, comp #pkts failed: 0, #pkts Dang failed: 0
    success #frag before: 0, failures before #frag: 0, #fragments created: 0
    Sent #PMTUs: 0, #PMTUs rcvd: 0, reassembly: 20th century / of frgs #decapsulated: 0
    #send errors: 0, #recv errors: 0

    local crypto endpt. : 12.12.12.2, remote Start crypto. : 11.11.11.2

    ------------------------
    ASA2 (config) # sh crypto isakmp his

    ITS enabled: 1
    Generate a new key SA: 0 (a tunnel report Active 1 and 1 to generate a new key during the generate a new key)
    Total SA IKE: 1

    1 peer IKE: 12.12.12.2
    Type: L2L role: answering machine
    Generate a new key: no State: MM_ACTIVE

    ------------------------

    ASA2 (config) # sh crypto ipsec his
    Interface: outside
    Tag crypto map: cmap, seq num: 1, local addr: 11.11.11.2

    access vpn ip 172.16.10.0 list allow 255.255.255.0 10.10.10.0 255.255.255.0
    local ident (addr, mask, prot, port): (172.16.10.0/255.255.255.0/0/0)
    Remote ident (addr, mask, prot, port): (10.10.10.0/255.255.255.0/0/0)
    current_peer: 12.12.12.2

    #pkts program: 49, #pkts encrypt: 49, #pkts digest: 49
    #pkts decaps: 50, #pkts decrypt: 50, #pkts check: 50
    compressed #pkts: 0, unzipped #pkts: 0
    #pkts uncompressed: 49, #pkts comp failed: 0, #pkts Dang failed: 0
    success #frag before: 0, failures before #frag: 0, #fragments created: 0
    Sent #PMTUs: 0, #PMTUs rcvd: 0, reassembly: 20th century / of frgs #decapsulated: 0
    #send errors: 0, #recv errors: 0

    local crypto endpt. : 11.11.11.2, remote Start crypto. : 12.12.12.2
    -------------------------

  • Multiple site-to-site vpn configuration

    I am able to successfully create two different ipsec tunnels and I need them to be operational at the same time. However, when I "crypto map" (physical) external interface of my PIX 515, one of them is operational both. The tunnels go to two different places, different peers and different pre-shared keys. I have to install a logical interface and one card for each or what? Any help is appreciated. I apologize if I didn't spend enough time looking for the forum for an answer, but I tried :-). If you could point me to an example configuration for this, would be great. Thanks in advance for your help.

    Mike

    use different sequence numbers for different VPN.

    card crypto outside_map 10 correspondence address outside_10_cryptomap

    card crypto outside_map 10 peer set 192.168.10.10

    outside_map crypto 10 card value transform-set ESP-3DES-SHA

    card crypto outside_map 20 match address outside_20_cryptomap

    peer set card crypto outside_map 20 192.168.20.20

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  • AnyConnect VPN configuration

    Hello

    I have ASA 5505 firewall (9.04), and I have 5 static public IP addresses that are forwarded to me by ISP. One of these addresses are used for the external interface in ASA. ATM AnyConnect VPN client to connect to the public IP address that is assigned to the external interface of the ASA. I want to change that while I've separated public IP dedicated for VPN connections. How can I do this? I thought I could just add 'Alias IP' to my external interface, but it doesn't seem to be possible with the ASA. How can I configure ASA to accept the different public IP address VPN connections?

    VPNS are always end the public interface ASAs. And the ASA has nothing as secondary IP addresses. The only option you have is that you use IP ASA for any NAT operation and ensure in this way that this IP is available.

  • VPN configuration file

    Hello

    I have a small question, I need to transfer the configuration of one VPN concentrator to another and I'm in the management of fle section and I'm clicking on the TFTP transfer but I don't know what controls to put in the fields. I see a box that says file hub and next to that is a box that says Action and there is the word Get in there and then I have 2 other boxes. I told TFTP server and the other says TFTP Server File.So can you tell me what that orders to put in those boxes to get the file to the VPN.

    Thank you

    There are several ways to do so.  Via TFTP, you can copy the CONFIGURATION file from a remote TFTP server using PUT.  TFTP file to the other 3 k and name CONFIG. BAK.  You can then go to the file management screen and Exchange configuration files.  Another option can be found on the link below.

    http://www.ciscotaccc.com/Kaidara-Advisor/security/showcase?case=K14611228

  • PIX VPN configuration

    Hello

    I have configured the PIX to make connections VPN to VPN clients and customers can see the entire network. How to configure the VPN to see only 2 guests to my network and nothing else?

    Concerning

    Kim Loefqvist

    You could do this is to change your

    inside_outbound_nat0_acl access list to allow the vpn to the subnet traffic from these 2 hosts rather than "all".

    HTH

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