Cisco asa site to site vpn hairpinning

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Cisco asa site to site vpn hairpinning

This kind of traffic pattern is called hairpinning or u-turn traffic. In the first hairpin example I explained how traffic from remote VPN users was dropped when you are not using split horizon, this time we will look at another scenario. Above we have a webserver using IP address This allows users on the Internet to access our webserver. We can do this by configuring hairpinning on our ASA. Take a look below:. H1 is on the same subnet as the webserver but is trying to reach the webserver using IP address With the default configuration of our ASA, traffic will be routed to the outside and will never end up at the webserver.

This allows a host on the outside to reach the webserver:. The first thing we have to do is to tell our ASA to permit traffic that enters and exits the same interface:. Explained As Simple As Possible.

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Full Access to our Lessons. More Lessons Added Every Week! Why need for access to web server using the public ip Which special scenario we will use like this? Could you please explain further? Hi Rene! Great Lesson. Just wanted to point out a typo that may need to be fixed. Please see below:. Just to add, one reason why we need hairpining is that there are some applications in the DC which need to create control channels on the public IP in order to communicate hence they need inside to inside NAT.I have spoke to the customers and they have added my new office internal range into the tunnel so that is allowed.

I've included the networks in the tunnel and also put some routes in to hit the customer MPLS routers in Site A but still no joy. I ended up having to get a Cisco specialist in from one of our suppliers who is helping us with a PABX project as I just couldn't figure it out. We spent about 3 hrs working through it, the routes etc were all fine, tunnel was all fine, didn't do anything with maps. We don't want to NAT so didnt put it in, but we then tried putting a static nat for everything local to everything in a tunnel group, static original original, and that did the trick!

Man that was a confusing and stressful few days but got there in the end. FIrst time I've had to call an external contractor in to help me but being a one man IT band in a company of staff, I needed the help on this one.

Whelton Network Solutions is an IT service provider. Assuming htat the routes exist from B and are reachable from there. Coming back, Site C, D and E will need to know that Site A is reachable via site B and so those locations will need to have their routing tables modified in order to know site A exists and doesn't leave via a default route, presumably to the internet.

Site A will need need to have the routes to those networks added to it's routing table and VPN's created to the remote sites, likewise the same would need to be done at the remote sites. This I don't have. The Site A ASA went in at short notice a few months back to replace a failed remote access solution so we put in in quickly to provide a new means for staff to get remote access and it works great for this.

After this we then migrated a couple of our other site to site VPNs from our legacy firewall which is due for replacement to this ASA.

But because of that I don't have any routes, these are all handled on my firewall. Do I also need to put routes in on Site B or just leave them in the tunnel.

Microsoft Azure To Cisco ASA Site to Site VPN

I think as well some of the IP ranges are public IPs I asked the customers to add our new Site B range to there tunnels so hopefully they have done that as I cant modify those. I want them to be reachable from site B via Site A. Also then have the reverse as the second rule. Just those 3 in that order. Think I might have to try and get a contractor in quick with some ASA experience as I only have 5 days before we move offices now yey for management dropping me in it.

Routing is reasonably basic is you consider each hop as an inidividual thing, before looking at the bigger picture. Think of directions you'd gice someone in the street. Down there, left at the bus stop, right at the shop, keep going straight until you see a big sign sayign whatever, then left, so on and so forth OK, from there, what does that hop do with it? Forwards it? And what does that do with it? You may just find you have to put a more specific route in on a few boxes quick win! In the first instance draw it out, and that way you know what is going where.

Don't forget the return paths need to be check as well. Routes, Maps, NAT, in that order. From each location ping each way to prove connectivity. But seems it needed explicated telling to not do it, but yeah seems OK now. To continue this discussion, please ask a new question. Get answers from your peers along with millions of IT pros who visit Spiceworks.

cisco asa site to site vpn hairpinning

Hopefully someone can help me here as I'm getting stressed out with it. Any ideas what I can do to fix this? Best Answer.Normally on the LAN we use private addresses so without tunneling, the two LANs would be unable to communicate with each other. R1 is in network The goal is to ensure that R1 and R2 can communicate with each other through the IPsec tunnel.

Phase 1 of IPsec is used to establish a secure channel between the two peers that will be used for further data transmission. This is what happens in phase We configured the IKEv1 policy and activated it on the interface but we still have to specify the remote peer and a pre-shared key.

This is done with a tunnel-group:. The pre-shared key is configured as an attribute for the remote peer. Once the secure tunnel from phase 1 has been established, we will start phase 2. In this phase the two firewalls will negotiate about the IPsec security parameters that will be used to protect the traffic within the tunnel. In short, this is what happens in phase First we configure an access-list that defines what traffic we are going to encrypt.

This will be the traffic between The IPsec peers will negotiate about the encryption and authentication algorithms and this is done using a transform-set.

Once we configured the transform set we need to configure a crypto map which has all the phase 2 parameters:. Explained As Simple As Possible. Full Access to our Lessons. More Lessons Added Every Week! It should be configured to translate all traffic from the The first lifetime ikev1 policy is for phase 1 and the lifetime in the crypto map is for phase 2.

Please explain. We have firewall where I have created site to site VPN. First time I have created crypto policy with group 2 and then changed to below. I modified the network in your example with a few more nodes on each site.

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The network diagram is attached. The IPSec tunnel is up. Ping from end node 1 to end node 2 is working. When checked with ASA logs, the tunnel is set up and the ping is getting delivered to the web server, but the web server is not responding to the pi. Ask a question or join the discussion by visiting our Community Forum.

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cisco asa site to site vpn hairpinning

No Questions Asked! Continue reading in our forum. Hi Rene, I modified the network in your example with a few more nodes on each site. When checked with ASA logs, the tunnel is set up and the ping is getting delivered to the web server, but the web server is not responding to the pi We use cookies to give you the best personal experience on our website.

By using our website, you agree to our use of cookies Read more.Hairpinning U-turn Traffic : Hairpinning is a term to describe traffic that is routed out of the same interface from which it entered. Crypto ikev1 policy 1 authentication pre-share encryption aes hash sha group 5 lifetime Crypto ipsec ikev1 transform-set Cisco esp-aes esp-sha-hmac.

NAT outside,outside source static Branch1-networks Branch1-networks destination static Branch2-networks Branch2-networks route-lookup. Hairpining with Cisco IOS. What a nice how-to, Randy. I really appreciate it. It looks like this is exactly what I needed for one of the implementations I work on. Shoudn't these ACL be otherway around? Please correct me if i am wrong.

Cisco ASA VPN Hairpinning

Buy or Renew. Find A Community. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. Labels: VPN. Concepts : Hairpinning U-turn Traffic : Hairpinning is a term to describe traffic that is routed out of the same interface from which it entered. Requirements: Cisco ASA firewall running 8. Tags: asa Cisco ipsec hairpining crypto.

Hi Randy, What a nice how-to, Randy. Thank you! Best regards, Jaro. It will be as follows as you rightly pointed:. Latest Contents. ISE 2. Created by ChristopherJohnson on AM.This is the second time have had to write this article purely because the Azure UI has changed! These were typically used with routers, because routers use Virtual Tunnel Interfaces to terminate VPN tunnels, that way traffic can be routed down various different tunnels based on a destination, which can be looked up in a routing table.

You may already have Resource Groups and Virtual Networks setup, if so you can skip the first few steps. Note : This will take a while, go and put the kettle on!

Make sure all running tasks and deployments are complete before continuing. You can do the next two steps together, but I prefer to do then separately, or it will error if the first one does not complete! Now you need to create a Local Security Gateway. To represent your Cisco ASA. I read somewhere that the ASA had to be at 9.

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Our VPN is going to use a pre-shared-key, you created in Azure above. Which in this case is the Azure Gateway. The thing that ties it all together is the crypto map. This is because, you can only have one crypto map applied to an interface, but you can have many crypto map numbers, i. And each VPN tunnel has its own number. There are a couple of extra commands you will need, these are sysops commands. These are recommendations from Azure.

The first one drops the maximum segment size to Also your ASA needs to be setup to allow pings, try pinging 8. If yours says something else, or nothing at all then phase 1 has not established. You need to Troubleshoot phase 1 of the VPN tunnel.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up.

This is due to the way the service is sold - it's billed per gateway. The end result being all traffic that hits Site 3 has come via Site 2. I understand this is known as hairpinning but I'm struggling to find a great deal of information on how this is setup.

So, firstly, can anyone confirm that what I'm trying to achieve is possible and, secondly, can anyone point me in the direction of an example of such a configuration? Take a look to this page. It provides a good example of what you want to take. As described at the end of the Background Information part, the interesting command is same-security-traffic so that you can allow site1 to exchange data with site3 There is another example here a bit more clear may be.

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cisco asa site to site vpn hairpinning

Active 10 years, 1 month ago. Viewed 1k times. Many Thanks. Nordberg Nordberg 94 1 1 silver badge 7 7 bronze badges. Active Oldest Votes. Thank You!!!! Very useful information. Will give it a shot and see how I get on Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast a conversation on diversity and representation.

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Featured on Meta. Feedback post: New moderator reinstatement and appeal process revisions. The new moderator agreement is now live for moderators to accept across the….Over the past few months, I have received a few requests regarding hairpin scenarios and the ASA.

In this article, the firewall is running version 8. To find the 8. As I stated in the article about the 8. I very rarely find that making a configuration unnecessarily complex is beneficial.

These, and other complex configurations, are really good exercises to understand how ASAs function and process traffic flows. For anyone that does find a beneficial use case for hairpinning, I recommend carefully labbing the initial configuration as well as future modifications. I can get traffic to from the 8. To dig into this, it may be necessary to look through some of the configuration.

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The Packet University. Skip to content. Cisco ASA 8. With over 15 years of experience in the technology industry, Paul has helped many organizations build, maintain and secure their networks and systems. This entry was posted in How-To and tagged asa. Bookmark the permalink. November 9, at PM. One is running 8. Follow PacketU Search for:.

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