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I am working with a TP-WR1043ND OpenWRT router which allows port mirroring, as described in the dedicated wikipage. I'm mirroring the WAN port (#0) to LAN port #4. There is no cable in the LAN port #4.

Now, since this device only has 4 LAN ports availble and I need more, I am using a switch (!) to extend the number of LAN ports. The switch connects to LAN port #3 and has 4xLAN ports itself.

I want to recieve the mirrored traffic that goes to LAN port #4 at a specific IP or a specific port, at the switch (!). The device that recieves the mirrored traffic can only be connected to the switch's LAN ports.

Is it somehow possible to accomplish this?

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  • For your configuration it is probably not possible. This should be possible if your switch supports VLAN and router supports vlan mirroring. Then you could, for example, mirror traffic to VLAN 5, confgure your port #4 as untagged VLAN 5, port #3 as normal + tagged VLAN 5. Finally, on the swtich you should set the specific port as untagged VLAN 5.
    – Andrey Sapegin
    Feb 20, 2015 at 21:59
  • @Andrey: I am not sure if the router does not support vlans for port mirroring. Though it does have vlans, which where necessary for this port mirroring feature I think. And I could use an old WRT54GL router with dd-wrt which supports vlans, as the switch. / completely other idea: Is it possible to use a single LAN cable for internet access AND transmitting the mirrored traffic, if the cable is attached to my mirror port #4 ?
    – user3200534
    Feb 20, 2015 at 23:03

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Answer for single cable to port #4:

If it is supported, all you need is to mirror traffic to VLAN 5 and configure your port #4 as normal + tagged VLAN 5 (5 is just for example). Also, on the switch you should set the specific port as untagged VLAN 5. Your router should support VLAN mirroring, not simply port mirroring.

If it does not, you could make it vice versa:

1) mirror WAN port to port #4.
2) configure port #4 as normal + tagged VLAN 5.
3) configure all ports EXCEPT #4 (and of course, WAN) on the router as VLAN 5 untagged.
3) configure all ports on the switch EXCEPT the specific one as VLAN 5 untagged.

Then only the specific port on the switch will get mirrored traffic, all other ports on router and switch will be in VLAN 5.

Finally, you need to configure routing for the VLAN 5 network on your router.

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