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Ipsecuritas could not start racoon7/31/2023 It also has its drawbacks, namely, it may not work if one of the peers is behind NAT, but at least it removes the limitation to a single connection of the same type on the RouterOS side (you can have several GRE over IPsec tunnels, but only one tunnel with a virtual interface on the remote peer). The setup you ask about now, which is based on use of GRE instead of a virtual interface as an entry point of the IPsec SA itself, is definitely an alternative, but it's a different approach, so it deserves a separate topic. But it will not be in just hours from now. As soon as I find enough time for that, I'll post the complete IPsec setup which should work against the FreeBSD one set the way you've posted originally. In parallel, I was remotely debugging an almost identical setup where the FreeBSD is substituted by Google Cloud Platform, but the debugging has come to a dead end as what perfectly works for me, on the same CPU architecture (圆4/CHR) and RouterOS release (6.45.9) like the OP of that topic uses, doesn't work for the OP.Īs in the meantime you have provided all the other settings necessary, the only thing which is not elementary is to compose the exception policies for the Mikrotik end. what are the limitations of that workaround.what is the essential incompatibility between the apparently only possible setup on the FreeBSD (with a virtual interface) and the definitely only possible setup on the RouterOS (with policy-based packet selection),.In my previous post, I've tried to explain This would significantly contribute to the promotion of Mikrotik products as this problem makes it difficult to use them in conjunction with existing OS such as Linux and FreeBSD. Let's assume that encryption methods and key information exchange policies have been achieved.Ĭould you or Mikrotik specialists provide the basic interface, routing, and ipsec sa policy settings so that the FreeBSD-Mikrotik ipsec tunnel works? Perhaps needed to change some settings on the FreeBSD side to match Mikrotik. Which Mikrotik settings should correspond to this scheme. Spdadd W.X.Y.Z/32 A.B.C.D/32 ipencap -P in ipsec esp/tunnel/W.X.Y.Z-A.B.C.D/require Spdadd A.B.C.D/32 W.X.Y.Z/32 ipencap -P out ipsec esp/tunnel/A.B.C.D-W.X.Y.Z/require Physical address inet A.B.C.D -> W.X.Y.Zĭestination Gateway Flags Refs Use Netif Expire Thanks for the information, let's assume the FreeBSD side settings will be in accordance with the schema. It only makes sense to dive into the details of how to set the encryption and integrity protection algorithms and peer authentication methods once you resolve this key aspect. This way, packets to 0.0.0.0-127.255.255.255 are matched by the first policy, packets to 192.0.0.0-255.255.255.255 by the second one, and only packets to 128.0.0.0-191.255.255.255 make it to the last policy which sends them down the SA.īy extending this approach, you can narrow the address range which makes it to the last policy to the destinatinon subnet you want to be sent to the FreeBSD peer while the traffic selector used to negotiate the SA will be "any to any". So first, check whether FreeBSD can support also the traffic selection method, and if yes, go that way. A workaround is possible, which consists in defining a list of exceptions from "any to any" and assigning "action=none" to these exceptions, but it can be used only for a single remote peer. The "virtual interface" approach uses an "any to any" traffic selector, so you cannot use a traffic selector on Mikrotik side and virtual interface on the remote side just like that. The traffic selector of the SA is not only used locally but also negotiated between the peers. That RFC also requires that received packets matching any IPsec traffic selection criteria that were not received via a corresponding IPsec SA must be dropped. ), source and destination addresses, and source and destination ports where applicable. The settings on the link you gave describe a setup which uses a virtual interface as an entry point to the IPsec processing of the packet, whereas RouterOS currently only supports the method specified in the IPsec RFC, which is selection of traffic for sending via the IPsec SA using matching on IP protocol (udp, tcp.
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