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Tutor

Jun 06, 2020

Solved

GS752TPv2 and DHCP

Hello all,

I hope somebody could help me with my problem. I recently got a GS752TPv2 and I am trying to make it work properly with my DHCP. Here is my installation right now for testing:

Internet <-> Router with DHCP <-> GS752TPv2 <-> my compyter

Addresses given by my DHCP are 192.168.1.x

If I plug direclty my computer to my router, I get a valid IP address (192.168.1.5 for example) and I can access to Internet. When I plug my GS752TPv2 to my router, it seems the switch doesn't recognize the DHCP and starts with IP 192.168.0.239. Of course, if I plug my computer in the switch, I don't get any IP address because the switch is not a DHCP server and it doesn't access to my router... I tried several configuration on the switch to make it find my router but without success (DCHP mode, static mode, reset, factory reset). I also updated it to last firmware (6.0.4.6) but nothing changed.

Did I miss something?
Thanks in advance,

Regards,

Benjamin

Tripo
Jun 08, 2020
I am replying to myself because Netgear's technical support found the solution. Without really understanding why, it seems my router was creating a loop. I deactivated STP and now everything works perfectly so if somebody also has an issue getting an IP using DHCP, try deactivating STP!

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schumaku
Guru - Experienced User
Jun 06, 2020
By default, these switches are L2 devices spanning a transparent LAN. If neither the switch itself nor a connected computer does get a IP address assigned, the first guess is that the network connection from the router to the switch isn't up, or (unlikely as you stated the same issue happens following a switch factory reset) there are multiple VLANs configured for the management, and for the ports used for the link to the router and the computer.
- Tripo
  Tutor
  Jun 06, 2020
  That's exactly my problem, the switch should be transparent and gets an IP from my DHCP but it doesn't, even after the factory reset. I am using nominal configuration (no VLAN, nothing set up) and it doesn't work. I really don't understand. Is there a way for me to run a diagnostic on the switch? I just bought so I don't think the problem comes from the switch itself but (if I'm really unlucky) it might...
  - schumaku
    Guru - Experienced User
    Jun 06, 2020
    Link LEDs on both ends of the connection router<-> switch are OK?
    
    You can always connect the switch Web UI by temporary re-configuring the computer to the 192.168.0.0/24 subnet (e.g. 192.168.0.123/24 255.255.255.0 subnet, default gateway any other address in that same subnet (and tick the connection config check which does exist on some overly smart OS) on applying the config. Now open the Web UI on http://192.168.0.239/ .... so you can check e.g. the port status on the router connection.