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I have 3 routers, let's call them A, B, C. I need to configure mesh VPNs (i.e. A-B, B-C, A-C) between them. Can I use the same IP as endpoint (local or remote) IP on the same router?

For example we now have 3 VPN connections:

  • A 192.168.1.1 - B 192.168.1.2
  • B 192.168.1.2 - C 192.168.1.3
  • A 192.168.1.1 - C 192.168.1.3

Will this cause problems? What if there are also OSPF on 3 routers? What if there are multiple concurrent VPN connections (different type) between the same routers using the same endpoint IPs?

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  • What router model and software version?
    – Ron Maupin ♦
    Commented Apr 9, 2017 at 6:16
  • @RonMaupin I'm using RouterOS CHR 6.38.5; however I want to know the general case too.
    – Jamesits
    Commented Apr 9, 2017 at 7:09
  • Some router software can do this, but some cannot. For example, Cisco has DMVPN that creates a dynamic any-to-any VPN. In your case, unfortunately, MikroTik does not offer optional, paid support, so questions about it are off-topic here.
    – Ron Maupin ♦
    Commented Apr 9, 2017 at 17:20
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can provide and accept your own answer.
    – Ron Maupin ♦
    Commented Feb 19, 2018 at 3:05

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You can use the same IP as source in multiple VPN as the destination is different and there is no issue if you use the same interface as another type VPN source. This is the general case, there is no logical reason to deny that

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