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Search titles only. Search Advanced search…. New posts. Search forums. Log in. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter Andy Start date 7 Jan Tags information technology ipsec site-to-site ipsec tunnel ipsec vpn mikrotik routeros site to site system administrator vpn tunnel.

Andy Administrator. Joined 7 Jan Messages Reaction score 6 Points Joined 15 Mar Messages 2 Reaction score 0 Points 1. I had an IPsec tunnel working in the past but for some reason it doesn't work anymore. Can't really recall if anything has changed except for maybe the firmware version, but both ends now run 6.

I am not able to ping from site1 to site2.

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Any idea why this isn't working? For the meantime, I'd suggest downgrading to your last working ROS version, or switch to long-term update channel.

What's new in 6. TemplarLord New member. Joined 17 Mar Messages 2 Reaction score 0 Points 1. I followed everything and have a working IPsec tunnel. Unfortunately both of my sites have dynamic IP addresses, so the tunnel only works while the site has the same public IP address until it changes.

As I see it, the only issue is that you can't specify a hostname in the sa-dst-address field in IPsec policy.With that out of the way, lets get started. The first step is to create a PPP Profile on the mikrotik. We will use a We also need to add a DNS Server. Next we add an l2tp-server server interface and set the allowed authentication methods, mschap1 and mschap2. We will also set the pre-shared-key secret in the process.

Note that these two rules need to be added to the top of the list, before any other rules in order to allow connections from the WAN interface. The final result should look something like this :.

I have moved this section to its own post, since this part is relevant to other scenarios too. You may read the full post here. I have recently set up this configuration and had a lot of trouble with the details. Your simple explanation looks very good. I do have one question. Am I missing something? Again, thank you for your instructions here! You need to use a different address, one which is not in use, for your ppp profile.

I have used If this happens to be your default gateway already then use something like Hope that clears it up. Works like a charme! Thanks for posting. One comment. I tried a bit more secure credentials cause sha1 and 3DES are not so secure anymore.

MikroTik IKE2 VPN своими руками

If you use it in native IPsec this works. I vaguely recall having the same issue using Windows XP with a Cisco router back in the day, I will try to find some time and test it out in a windows vm and report back my findings.

Mine also works great thanks! PS, I come from a Zyxel and Nokia background, not confident enough to mess around with settings just yet. Actually ignore my question. I already had the correct firewall rules in place. Just moved it above and now works like a charm.

Create an IPsec tunnel between 2 Mikrotik routers and dynamic public IPs

Thanks so much for awesome guide! Post Navigation I. Previous Post: Install Zabbix 4 on Ubuntu Kenny 6th September at - Reply. Johann Fenech 21st September at - Reply. Johann 8th October at - Reply. Stephan 10th December at - Reply.I add routing marks, then add a route for these marks to my interface. A second route makes sure no traffic is routed when the interface is down: Code: Select all.

I am using the specific ports now instead of connection mark. Sindy made a blackhole by using an extra bridge. Then: Code: Select all. Last edited by msatter on Sat Jul 13, am, edited 1 time in total.

Running: RouterOS 6. With IPSec policies things work different. But I can not decide by out interface as that does not differ with policies. Traffic not encrypted marked for IKEv2 has so nothing lost in routing so when detected be indicated as unreachable. The point is that IPsec policies' traffic selectors choose the packets for interception on their way to the interface, so any route which doesn't let them get out via an interface will also prevent them from being intercepted by the policy. And although it normally doesn't make much sense to use a point-to-multipoint interface as a gateway, there are cases where it does, so it is a permitted configuration which is likely to stay.


It catches the packets if the dynamic rule by mode-config is not present. Code: Select all. If I route the packets to a bridge with no ports and no addresses I have a blackhole.

But there is no way for the packets to be encrypted and sent the right way, no? Can you explain in more detail and possibly with example configuration? However, I could not find any way how to provide the icmp feedback administratively prohibited, unreachable etc.

The question is whether it is worth the effort - for me it wasn't, so I didn't test it and thus I may be missing some caveats.

mikrotik ipsec policy

Plus when the VPN connection drops for a while and then re-establishes, silent drops don't break the established TCP sessions whereas icmp feedback packets likely would; this was another reason for me not to pay attention to the possibility to send them. The filter rule is there to be absolute sure noting goes out the Wan that not meant to be and so being a back-stop.

If possible the omitting the NAT to Wan is an option. It will head for the WAN which is transfering anything not specific caught by other routing rules. Outgoing encrypted traffic will fall dead because the receiving IKEv2 server is not there anymore.

The VPN provider should block these cross overs, it is leaking traffic. Statefull filtering will stop that but if you want you can see the content if you accept it. But maybe the following is an answer to your posts too? What happens with a packet if it is not intercepted by an IPsec policy is determined before the match to IPsec policy's traffic selector is attempted. There is no L3 packet processing layer after the IPsec policy matching which could take any action if no policy matches the packet.

All routing and all evaluation of routing-markconnection-mark etc. Vice versa, if the packet is not routed towards any interface because it matches a blackhole, prohibit or unreachable route, it can never be matched by any IPsec policy nor even src-nated.It creates an encrypted tunnel between the two peers and moves data over the tunnel that matches IPSEC policies. Policies are the settings that define the interesting traffic that will get pushed over the tunnel.

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If packet traffic isn't covered by a policy it isn't interesting, and gets routed like any other traffic would be. If packet traffic does match what's in a policy, the router defines those packets as interesting, and sends them over the tunnel, rather than routing them. IPSEC isn't based on routing, it's based on policy. In fact in the diagram below when tracerouting from one LAN subnet to another through two branch routers and multiple Internet routers only one hop is seen.

Below is the physical topology diagram of what we're working with, and it shows the logical connection that the IPSEC tunnel will create between subnets. We have two routers, in Seattle and Boise, both connected to the Internet somehow with their own static IP addresses.

These routers could be at two offices owned by one company, or just two locations that need to be connected together. We need computers or servers at one location to be able to contact devices at the other, and it has to be done securely. The peer will point to the opposite router's public IP address, with Seattle pointing to Boise and Boise pointing to Seattle.

It's very important to add comments to your peer and policy entries, so you know which points to which. The encryption algorithm and secret must match, otherwise the IPSEC tunnel will never initiate properly.

In production networks a much more robust secret key should be used. This is one time when network administrators often generate long random strings and use them for the secret, because it's not something a human will have to enter again by memory. Secret keys should be changed on a regular basis, perhaps every 6 or 12 months, or more often depending on your regulatory needs.

Do not enable NAT traversal, it's pretty hit-or-miss. These are what tells the router was traffic is "interesting" and should be sent over the tunnel instead of routed normally. If you look at the policies side-by-side you'll notice that the IP address entries on both routers are reversed - each router points to the other.

It really helps to open up the same dialog boxes in two Winbox windows, looking at them side-by-side, checking that the SRC address on one router is the DST address on the other. We'll create these NAT rules on each router, and move them up above any others. If no interesting traffic is being pushed over the tunnel most routers tear the tunnel down and don't bring it back up until the policies are triggered again with interesting traffic.

This can create a tiny bit of latency when traffic first starts, a moment is needed to build the tunnel. RouterOS features like Netwatch and scheduled ping scripts can create traffic that keeps the tunnels up, but you shouldn't see an appreciable difference, especially if you're moving data frequently from one subnet to another. In the Remote Peers tab it also indicates that the Seattle router is an established remote peer:. Notice that I specified the source address in the traceroute above.

This is so that the packets sent for the traceroute will appear to originate inside the IPSEC policy's SRC network, and be headed to a DST network that matches the policy as well - interesting traffic.Together they provide means for authentication of hosts and automatic management of security associations SA.

Most of the time IKE daemon is doing nothing. There are two possible situations when it is activated:.

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There is some traffic caught by a policy rule which needs to become encrypted or authenticated, but the policy doesn't have any SAs. IKE daemon responds to remote connection. In both cases, peers establish connection and execute 2 phases:.

Note: There are two lifetime values - soft and hard.

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When SA reaches it's soft lifetime treshold, the IKE daemon receives a notice and starts another phase 2 exchange to replace this SA with fresh one. If SA reaches hard lifetime, it is discarded. Warning: Phase 1 is not re-keyed if DPD is disabled when lifetime expires, only phase 2 is re-keyed. To force phase 1 re-key, enable DPD. Warning: PSK authentication was known to be vulnerable against Offline attacks in "aggressive" mode, however recent discoveries indicate that offline attack is possible also in case of "main" and "ike2" exchange modes.

General recommendation is to avoid using PSK authentication method. IKE can optionally provide a Perfect Forward Secrecy PFSwhich is a property of key exchanges, that, in turn, means for IKE that compromising the long term phase 1 key will not allow to easily gain access to all IPsec data that is protected by SAs established through this phase 1.

mikrotik ipsec policy

It means an additional keying material is generated for each phase 2. Generation of keying material is computationally very expensive. Exempli gratia, the use of modp group can take several seconds even on very fast computer. It usually takes place once per phase 1 exchange, which happens only once between any host pair and then is kept for long time.

PFS adds this expensive operation also to each phase 2 exchange. Diffie-Hellman DH key exchange protocol allows two parties without any initial shared secret to create one securely.

More on standards can be found here. The same way packets with UDP destination port that are to be delivered locally are not processed in incoming policy check. Warning: Ipsec is very sensitive to time changes. If both ends of the IpSec tunnel are not synchronizing time equally for example, different NTP servers not updating time with the same timestamptunnels will break and will have to be established again.VPN V irtual P rivate N etwork is a technology that provides a secure and encrypted tunnel across a public network.

Site to Site VPN technique establishes a secure tunnel between two routers across public network and local networks of these routers can send and receive data through this VPN tunnel.

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IPsec is a network protocol suite that authenticates and encrypts the packets of data send over a network. In this network, Office1 Router is connected to internet through ether1 interface having IP address In your real network this IP address will be replaced with your public IP address.

Similarly, Office2 Router is connected to internet through ether1 interface having IP address In your real network this IP address will also be replaced with public IP address. We will configure site to site IPsec VPN Tunnel between these two routers so that local network of these routers can communicate to each other through this VPN tunnel across public network.

IP information that I am using for this network configuration are given below. Change this information according to your network requirements. Complete configuration can be divided into four parts. Now we will do similar steps in Office 2 RouterOS.

Now we are going to start IPsec Peer configuration. In IPsec Peer configuration, we will specify peer address, port and pre-shred-key. IPsec Peer configuration in Office 1Router has been completed. IPsec Peer configuration in our both Office Routers has been completed. It is important that proposed authentication and encryption algorithms must match on both routers.

Mikrotik L2TP / IPsec VPN Server Step by Step configuration with Fasttrack enabled!

In this example, we will use predefined default proposal. You will find default proposed authentication algorithms and encryption algorithms in Proposals tab.

In this part we will only configure IPsec Policy on both routers. IPsec Policy configuration in Office 1 Router has been completed. At this point IPsec tunnel will be created between two office routers but local networks cannot communicate with each other. This is because both routers have NAT rules that is changing source address after packet is encrypted.

Remote router receives encrypted packet but is unable to decrypt it because source address do not match address specified in policy configuration. We will now configure NAT Bypass rule in our both Office Routers otherwise local network will not be able to communicate with each other. To check your configuration, do a ping request from any local network machine to other local network machine.

If everything is OK, your ping request will be success.By Adrian Moreno January 26, The first thing to take into account is that LAN addresses must be different between Site 1 and Site 2.

In our example, Site 1 uses LAN You can replace these networks with the ones in your infrastructure. Another thing to consider is if your routers are behind a NAT. In this case you will have to make sure to forward port UDP to the Mikrotik router. In order to configure the IPsec tunnel, we have to setup the proposal, the peer, and the policy. We are going to provide the commands to configure Site 1, so once you finish with the guide, start over reverting the source and destination LAN addresses to configure Site 2.

Leave the address as it is as we will update it later from a script.

MikroTik Site-to-Site IPsec Tunnel

The IPsec portion is now configured in Site 1. It is important that this rule is placed in the first position. In this guide we are using the No-IP. You are free to use whatever dynamic DNS service you want. Once you have created an account and a host for Site 1, go ahead and the following script to update the No-IP host and the IPsec policy in the event of an IP change.

You can run the script manually and check the logs to verify whether the No-IP host and the IPsec policy are updated successfully. Now we need to create an scheduler to run the script every time period. We considered that a 10 minute interval is quite balanced, but you can adjust it to your particular needs. Do not worry about the IP that this host is resolving to, it will be updated in Site 2 when we repeat the steps on Site 2. You can run the script manually and check the logs to verify that the IPsec peer and policy are updated successfully.

We are now done with the configuration on Site 1, so it is time to move to Site 2 and go through it again configuring the IPs in the reverse order.

mikrotik ipsec policy

If you feel so inclined, please let us know how it went and leave some feedback if you find it useful. Template by Bootstrapious. Ported to Hugo by DevCows. The network layout is as follows: The first thing to take into account is that LAN addresses must be different between Site 1 and Site 2. Copyright c -DevCows; all rights reserved.

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