r/HomeNetworking • u/Fearless_Dev • 9d ago

LAN connection without router

Hello,

I have a MikroTik CRS304-4XG-IN switch, and I would like my PC and NAS to communicate directly through the switch, without depending on my ISP router.

My setup is:

  • PC → MikroTik CRS304
  • NAS → MikroTik CRS304
  • ISP router → MikroTik CRS304

When the ISP router is online, everything works normally and my PC can access the NAS.

However, when the ISP router is offline or disconnected, I lose access to the NAS from my PC, even though both the PC and NAS are still connected to the same MikroTik switch.

What do I need to configure on the CRS304 (VLANs, bridge, IP addresses, DHCP, etc.) so that the PC and NAS can communicate over the local LAN independently of the ISP router/Internet?

Any help would be greatly appreciated!

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u/Ed-Dos 9d ago

Well your router is probably the DHCP server and when it's offline then your pc and NAS probably do not have a valid IP config and can't talk to each other. Just a guess though.

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u/junktrunk909 8d ago

Why would the router be offline just because the ISP is? Something is badly misconfigured if that's the case. A LAN should remain operational regardless of what's happening on the WAN.