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I have a Mikrotik RouterOS v6.36 with my network as follows (I am a newbie to networking in general and have been able to get stuff working half way. I just don't know what to look for.)

  • Router:
    • Ether01: ISP Connection(Internet/WAN)
    • Ether02: SIP Trunk(SIP Trunk - No internet)
    • Ether03: Null
    • Ether04: LAN

I have a PBX server on the LocalLan that needs to connect out via Ether01 to authenticate licenses etc. This works fine with no problem.

I now need to connect Ether02 which is a SIP trunk from our ISP to our PBX server.

I am able to get the Router to mark routes and send them out via Ether02 but I am not able to get that data to respond back through Ether02

Please could somebody give me guidance and let me know what data is required to help troubleshoot this.

  • This might be a routing problem in PBX, so just check if the PBX can send packets to the mikrotik ether2 IP. – Arash Apr 26 '17 at 20:25
  • Hi Arash, I seem to have found the problem. There seemed to be a confusion on my incoming DSTNAT rules between the two Ether ports. – Johan Marais Apr 28 '17 at 18:03
  • Maybe you should delete this question then. – chicks May 5 '17 at 19:24
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I just had to specify my DSTNAT rules for each ethernet port, instead of having using generic incoming rule

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