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Forum Discussion
Dinner42w_aView
Nov 27, 2025Aspirant
Can LAN interface of RS100 be set to a public IP address?
I have obtained a /29 range of public IP addresses from my ISP. That /29 network resides on the LAN interface of the cable router/modem/whatever you want to call it. At the moment I am using a Zy...
CrimpOn
Nov 27, 2025Guru - Experienced User
p.s. As an experiment, I just now configured an Orbi 750 router to set the LAN subnet to public IP address 12.0.0.0 (255.255.255.0). Took it just fine. Assigned 12.0.0.1 to the router LAN and 12.0.0.x addresses to devices connected to the router. One concern is that the router interface does not accept an IP subnet different from 255.255.255.0 It is possible to restrict the DHCP range on the router. Probably not an issue with this setup since the RS100 only exists to provide the PPPoE user name/password.
It could be that the RS100 does not allow the same configuration options as the Orbi.
oh fudge, did not think about WAN/LAN conflict. The Orbi router refuses to create a LAN subnet that is part of the WAN subnet. If there was a way to delete this post, I'd do it.
NEVER MIND.
- StephenBNov 28, 2025Guru - Experienced User
CrimpOn wrote:
The Orbi router refuses to create a LAN subnet that is part of the WAN subnet.
Obviously that would be a problem for this use case.
But the Orbi has no way to turn off NAT filtering (unlike the RS100). At least that is the case with the 870.
If you aren't doing NAT, then it makes sense for the LAN subnet to be part of the WAN subset. In fact, I can't think of any scenario w/o NAT that you wouldn't want that.
So the RS100 might behave differently.