Question of VTI of ipsec.

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• VPN IPSec/SSL VPN concentrator

  Hi all

  Can a simple question, I activate both IPSec and SSL VPN on the same hub box?

  Kind regards

  MAK

  Yes

• VTI & OSPF tunnel

  Hi all

  I have configured the interfaces of tunnel VTI (ipv4 ipsec tunnel mode) and OSPF on which interacts.

  VTI is encrypt all traffic data. But what about the OSPF traffic?

  Is encrypted as OSPF traffic or I need to configure OSPF authentication?

  Thank you

  OSPF Exchange is already encrypted inside the tunnel, so u don't have to use the ospf authentication. OSPF uses IPs of tunnel for the communications and traffic between these two addresses is possible only through the secure tunnel.

• PIX 515E (7.0.1) - problem with the VPN connection between inside and outside

  Hello

  I ve creates a VLAN on the pix.

  In this VLAN, users are allowed to connect only to the Internet. Everything is fine, but when trying to connect with his VPN Client to their company, it has problems... (Outside traffic flow, but no traffic came back.)

  Is the only solution for this problem to create a Pool of Nat with public ip addresses, one to one mapping, or is there another solution with a public IP address (NAT on PAT) possible for this problem?

  Thanks for your replies.

  D.

  The problem is that the esp is an IP Protocol, so PAT will not work in this scenario. When the return traffic returns to pix he doesn't know how to get to the inside host. The only way to do this is by adding a static nat (1 to 1 mapping) and create a rule to allow esp. Is what type of vpn client? Microsoft vpn? Cisco vpn? If cisco VPN, perhaps, they can use NAT - T on the vpn that overcomes the question PAT by encapsulating ipsec within UDP packets. You need to talk to the admin VPN and itself it allow.

  -kevin

• VTI transform whole NAME and ipsec profile NAME must match?

  Just a quick question.
  Establishing a VTI between two end points and I want to know best practices.

  Transformation set NAME match?  My tests show that it's OK to not have the same name on each end as the works of large tunnel.

  The NAME ipsec profile must match? Again my tests shows that it is OK to not have the same name on each end as the large tunnel works.

  Is this OK for the number of policy isakmp to not be the same on both ends. Tests show that it's OK as well.

  While I know have different NAMES on each side work, I would like to know if its safe for production in that its does not cause me issues down the line.

  The reason why I ask, I've read that both sides match, but only what settings, or is it the settings and names?

  Hello

  Only the parameters must be mapped on the ends and not the names. ISAKMP policy numbers and names are locally important and so it does not need to match both sides. Let me know if you have further questions.

  HTH,

  Khaldi

• Cisco VTI and configuration of IPSec (IKE Phase2) ITS proposal.

  Hello

  I have a question about the functionality of the virtual Tunnel Interface (VTI) configuration option. I have a Cisco IOS router, ending individual customers with the tunnel interfaces. The question I have now is that how can I specify the traffic 'interesting' on the security association proposal ITS IPsec (IKE Phase2). The configuration of the router is made by cryptographic profiles like this:

  !

  crypto ISAKMP policy 10

  BA 3des

  preshared authentication

  Group 2

  !

  Crypto isakmp ISAKMP_PHASE1_PARAMETERS profile

  key ring PRESHARED_KEYS

  function identity address 1.2.3.4 255.255.255.255

  !

  door-key crypto PRESHARED_KEYS

  pre-shared key address 1.2.3.4 key xyz

  !

  Crypto ipsec transform-set esp-3des esp-sha-hmac VPN-TRANSFORMSET

  !

  Profile of crypto ipsec ISAKMP_PHASE2_TUNNEL

  game of transformation-VPN-TRANSFORMSET

  PFS group2 Set

  ISAKMP_PHASE1_PARAMETERS Set isakmp-profile

  !

  Tunnel1 interface

  IP 10.10.10.1 255.255.255.252

  IP mtu 1450

  source of tunnel Loopback1

  tunnel destination 1.2.3.4

  ipv4 ipsec tunnel mode

  Tunnel ISAKMP_PHASE2_TUNNEL ipsec protection profile

  !

  Now when I look at the output of the command 'See the crypto ipsec his tu1 int' I get the following:

  ....

  Interface: Tunnel1

  Tag crypto map: x.x.x.x addr Tunnel1-head-0, local

  protégé of the vrf: (none)

  local ident (addr, mask, prot, port): (0.0.0.0/0.0.0.0/0/0)

  Remote ident (addr, mask, prot, port): (0.0.0.0/0.0.0.0/0/0)

  current_peer 1.2.3.4 port 500

  LICENCE, flags is {origin_is_acl},

  ....

  However, the peer on the other side do not accept the proposal, as it would like to have specific IP subnets on the IPSec security association proposal parameters. He would accept the policy if the identity local remote proxies, for example, would be 192.168.10.0/255.255.255.0/0/0 (local) and

  192.168.200.0/255.255.255.0/0/0 (remotely).

  Y at - it 'interesting' no IOS configuration for traffic configuration option on the profile of crypto? With the crypto map - basic configuration you can specify interesting traffic with an ACL under the crypto map configuration section.

  I'm in IOS version 15.1 (4) M with Advanced IP Services have together.

  Hello

  ASIT will always want to negotiate a whole as traffic selectors.

  What you MIGHT find is multi-SA DVTI configuration, in what remote end could say what proxy identity he would like to encrypt. (Supported from 15.2 M / T)

  Unfortunately, the ceveat of this configuration is this remote end needs to open the negotiation.

  M.

• IPSec and packet loss: Question

  Hello, hopefully a simple Question :-)

  Can someone tell me what happens when an IPSec packet is lost.

  He get fired?

  are just the TCP packets inside IPSec resentment tunnel?

  I hope someone can help!

  Background: VoIP.

  We have Home office users.

  Some have a quality of voice some terrible have a perfect quality, even if they all use the same hardware and configurations (name of user/passwords different and IP addresses of course)

  Fraser

  There isn't anything in IPSec that would retransmit a lost package. It is the native protocol and terminal stations that communicate in order to determine if there is packet loss and whether or not to broadcast.

  If I understand your comment correctly that you are dealing with individual users do VOIP, then more things you mention, which is different (name of user and password and addresses) almost certainly dealing with various different service providers / Internet connectivity. It would be interesting to do a ping extended with a large number of ping packets to a user who experiences problems and one that does not. I suspect that you will see a significant difference in packet loss.

  HTH

  Rick

• IPSec Transport Mode question

  Hello

  We currently have a VPN site-to site mode tunnel linking our business network and our site of DR to provide replication secure on our site of Dr. I have doing some changes to firewall this weekend that will set a FW IOS Zone-Based between the 2 sites (to provide 2 firewalls for the corporate site - creation of a demilitarized zone in the middle).

  The company's website and the site of DR are all our autonomous system, so there is no NAT invovled, as all the roads are private. I have a VPN to provide extra protection to every place, because they are both accessible via Internet (I wanted that the thin ACL on each ASA outside interface) anyway, to my question.

  I implement a firewall area on the border router to provide extra protection. In the ACL of the pair area between my company and recovery site, if I change the VPN in transport mode, should work in these ACE?

  Company ASA = 1.1.1.1

  NET company = 10.10.10.0/24

  DR. ASA = 2.2.2.2

  Net DR = 20.20.20.0/24

  esp permits 10.10.10.0 0.0.0.255 20.20.20.0 0.0.0.255

  permit udp host 1.1.1.1 host 2.2.2.2 eq isakmp

  esp permit 20.20.20.0 0.0.0.255 10.10.10.0 0.0.0.255

  permit udp host 2.2.2.2 host 1.1.1.1 eq isakmp

  I'm sure that it is correct; However, I wanted to reassure a bit, before I made these changes on Saturday.

  This link describes IPSec offers a Protocol, transport and tunnel mode with these characteristics, what I mean is that the ASA as a Cisco solution does not support the mode of Transport for Lan to Lan tunnels.

  Now, sinc evous made me hesitate on my response, I made a quick test linking 2 ASA backpack and a tunnel from lan to lan using the mode of transport, the tunnel has come fine but traffic does not parameter, with reason? the ASA has been falling due to the fact that SA and the classification of the secured traffic should be peer (as tunnel normal mode circuit) in our case the ASA received a package ESP from the internal network of the ASA remote which does not correspond to the classification that's why it was ignored.

  Application of ESP and eliminated from 11.1.1.2 for outside: 10.1.1.2

  Refuse the Protocol entering 50 CBC outside: 11.1.1.2 dst identity: 10.1.1.2

  This message appears after configuring nat and acl rules to see if it accepts the traffic:

  IPSEC: Received a package of non-IPSec (Protocol = ESP) 11.1.1.2 to 10.1.1.2.

  So, as you can see it looks more like a limitation of the platform or something.

  Now, the question I have for you why the need for mode of transport?

• VPN/IPSec-L2L - Question?

  Hello!

  Recently, I was doing some troubleshooting on a connection VPN/IPSec Lan-to-Lan between a Cisco PIX515E and a Linux firewall. My question concerns the configuration and is not the problem itself.

  Traffic interesting (encrypted traffic) defined and configured the LAN of PIX (inside) and the distance public IP? Which means that the Peer IKE and the interesting remote control LAN/IP are the same... and it works!

  Any ideas?

  Thank you

  JP

  As long as you source the package from the local network of Pix to remote public IP, the tunnel will work well and works :-)

  So, if you really look at the fluidity of the traffic, you're sourcing traffic from Pix LAN intended to public IP remote that corresponds to the defined access list. Thus, the pix knows he has encrypt traffic and now seeks the cryptographic endpoint points (pix outside IP public IP remotely) and sends the encrypted packets. So, this configuration works perfectly.

  In fact, Pix will not allow Telnet the external of the pix interface unless the traffic is through an IPSEC Tunnel and it was one of the establishment who gave a telnet access to the external interface of the Pix, it's LAN to the public IP of Pix through an IPSEC Tunnel.

  Kind regards

  Arul

  * Please note all useful messages *.

• IPsec Site to Site and the question of the IPsec remote access

  Our remote access IPsec 3DES 168 bit encrption has the value

  If we want to allow a remote user to get out of a tunnel to another site must be so 3DES encryption for the Tunnel?

  This tunnel is currently defined by AES.

  If I understand your question the answer is this:

  The VPN client will connect to the ASA with any encryption method, he chose.

  If the VPN client then runs through a tunnel from Site to Site to another location, it uses the encryption method specified in the tunnel from Site to Site.

  This is because as the settings for the client VPN applies only when he puts an end VPN on the ASA.

  When the customer traffic, passes through a different tunnel, the settings for this tunnel applies.

  Hope I answered your question, if not please let me know.

  Federico.

• Question about the life of the IPSec Security Association

  Hi all

  I'm confused about life. A book, they said that you should service life of the peer to keep two exact same, otherwise you can not establish the tunnel. But I saw another book says you can use different to life (time interval or byte count), two peers will choose the lower one.

  Please help me. Thanks in advance.

  Banlan

  There are two lives involved with IPSec, Phase 1 (ISAKMP) and Phase 2 (IPSec) connections.

  With the Phase 1 tunnel, if the initiator has a longer life than that the answering machine, the answering machine does not accept the connection, then it is certainly preferable to keep your the same Phase 1 lives.

  Phase 2, life will be negotiated at the lower of the two values regardless of intiates, if it is not serious. Always advised to keep living the same since you can run questions of negotiation with devices from different vendors.

• IPSec ipv4 to ipv6 vti possible?

  Hello

  I think to spend my backbone VPN ipv4 in ipv6, but behind all of my classmates (vti), everything is in ipv4.

  So I would start by changing only the spine and not the networks behind it, is it possible?

  to resume, is it possible to do that:

  network IPv4 ==> Cisco ISR (lan ipv4 inside). (ipv6 wan outdoors)<======= ipv6="" ipsec="" vpn="">

  ===> Cisco ISR (ipv6 wan outdoors). (lan ipv4 inside) ==> B ipv4 network

  Thanks for your comments.

  Best regards

  Nicolas

  Nicolas,

  Can you enable IPV6, routing unicast on two sides and try again?

  See you soon,.

• VRF support IPsec with dynamic VTI

  Hello

  I am Configuring IPSEC compatible with dynamic VTI e VRF. I followed the guidelines of the document

  http://www.Cisco.com/en/us/docs/iOS-XML/iOS/sec_conn_vpnips/configuration/15-2mt/sec-IPSec-virt-tunnl.html#GUID-C0A165BF-5866-4B13-BD73-0892B7E65488

  According to the example: "taking VRF support IPsec with a dynamic VTI when VRF is configured under year ISAKMP profile" I should be able to configure the features of the vrf and virtual-model under the same crypto isakmp policy.

  Unfortunalety, if I try to do, I get the following message

  R4 (conf-isa-prof) #virtual - model 1

  % VRF already set to isakmp profile. Unauthorized virtual model

  Is anyody knows why I'm not able to follow the configuration of this example?

  Here's my profile setup and configuration of the virtual model

  Crypto isakmp profile

  VRF HAS

  A Keyring

  function identity address 192.168.0.2 255.255.255.255

  type of interface virtual-Template1 tunnel

  Unnumbered IP Loopback2

  ipv4 ipsec tunnel mode

  Profile of tunnel ipsec protection has

  I do the test on the router of runningon 3725 XW3 IOS 12.4 (11).

  Thank you in advance for advice.

  Concerning

  Lukas

  Lukas,

  I don't know, but probably this was not yet supported 12.4.

  The document you're viewing is for IOS 15.2. I don't know by heart if your 3715 can run 15.2, if not give 15.1 (4) Mx to try?

  HTH

  Herbert

• VTI and NAT IPsec Tunnel mode

  Hello world

  I don't know that this subject has been beaten to death already on these forums.  Nevertheless, I have yet to find the exact solution, I need.  I have three machines, two routers and an ASA.  One of the routers sits behind the ASA and I have a GRE VTI configuration between two routers with ASA NATting, one of the routers to a public IP address.  I can guarantee the tunnel mode IPsec transport, but as soon as I pass in tunnel mode, the communication fails even if the SA is established.

  Please see the configuration below and tell me what I am missing please.  I changed the IP addresses for security.

  The following configuration works when transform-set is set to the mode of transport

  Note: The Router 2 is sitting behind the ASA and is coordinated to the public IP 200.1.1.2

  Router 1:

  Crypto ipsec transform-set SEC esp - aes 256 esp-md5-hmac

  tunnel mode

  !

  Crypto ipsec IPSEC profile

  transformation-SEC game

  !

  !

  interface tunnels2

  IP 172.16.1.1 255.255.255.252

  tunnel source 200.1.1.1

  tunnel destination 200.1.1.2

  Ipsec IPSEC protection tunnel profile

  !

  SECURITYKEY address 200.1.1.2 isakmp encryption key

  !

  crypto ISAKMP policy 1

  BA aes 256

  md5 hash

  preshared authentication

  Group 2

  ASA:

  public static 200.1.1.2 (indoor, outdoor) 10.1.1.1 netmask 255.255.255.255

  Router 2:

  interface Tunnel121

  address 172.16.1.2 IP 255.255.255.252

  IP nat inside

  IP virtual-reassembly

  tunnel source 10.1.1.1

  tunnel destination 200.1.1.1

  Ipsec IPSEC protection tunnel profile

  !

  Crypto ipsec transform-set SEC esp - aes 256 esp-md5-hmac

  tunnel mode

  !

  Crypto ipsec IPSEC profile

  transformation-SEC game

  !

  SECURITYKEY address 200.1.1.1 isakmp encryption key

  !

  crypto ISAKMP policy 2

  BA aes 256

  md5 hash

  preshared authentication

  Group 2

  There is no access-lists on the SAA except to allow a whole ICMP

  I am very grateful for any guidance you can provide in advance guys.

  Hello

  MTU, and the overhead was in this case.

  You changed encapsulating ipv4 instead of LIKING - which have less overhead (no GRE inside). This is why it started working.

  If you want to continue using GRE you decrease the MTU as described.

  ---

  Michal

• IPv6 on IPv4 VTI ipsec traffic

  Hello

  I have a VTI ipsec on ipv4 I use for LAN traffic between sites.

  Something like:

  interface Tunnel0

  IP 172.16.1.1 255.255.255.0

  tunnel source 80.80.80.1

  tunnel destination 90.90.90.1

  ipv4 IPsec tunnel mode

  protection of IPsec profile vti_profile tunnel

  Now I want to tunnel IPv6 on those as well.

  I tried the simple addition of an IPv6 on Tunnel0 address, but that did not work.

  I can create a tunnel on the IPv4 link like this:

  Tunnel1 interface

  source of Tunnel0 tunnel

  tunnel destination 172.16.1.2

  ipv6ip tunnel mode

  enable IPv6

  3000::1/112 IPv6 address

  But I was wondering if there was another solution?

  See you soon,.

  Sylvain

  Sylvain,

  I don't think you can carry IPv6 on IPv4 ASIT.

  I believe that you have received a message that's not supported - negotiated proposals are explicitly for IPv4:

  local  ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0)
  remote ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0)
  

  There is a tunnel mode ipsec, ipv6, BUT it is ipv6 via IPv6 only.

  I think that your best choice is to run o IPsec instead of ASIT GRE if you want IPv6 tunnel at the same time.

  (Please note that I have not kept up-to-date with all the improvements of VTI recently, maybe things have changed)

  Marcin