SOLVED - How configure? ISP-router, DNS-based adblocking, guest network

Installing and Using OpenWrt
1

Situation
ISP-router/modem (IP: 192.168.2.254)
o not possible to set in bridge mode
o not possible to change DNS-servers serverd by DHCP
o can turn off DHCP

openwrt (on Netgear WNDR3800)
o OpenWrt 18.06.1 r7258-5eb055306f

Requirements
o DNS-based adblocking (now usering pihole on raspberry pi)
o wireless guest network separated without access to equipment on LAN
o raspberry pi (as server) reachable from the internet

Question
o how shoud I configure openwrt?

2

Solution: Double NAT (not recommended)

1 Like
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Other requirement is also that my raspberry pi, must be reachable from the internet (as server), so double NAT is not an option?

4

double nat just means you have to create the port forwarding on the isp-router and openwrt. usually they dont change often, so no problem.
take care what services you are exposing to the internet thou.

just disable wifi on the isp-router and setup everything on the wrt, should work fine.

1 Like
5

Thanks, I'll try

6

Thanks!! everything works great. The wifi network on my ISP router seams to be a guest network automatically, because all devices attachted to my openwrt router are not visible (and to the ISP-router only TV's are connected).

I place my raspberry in the DMZ of the ISP router (port forwarding does not work correctly on my ISP router). In Openwrt I forward only one needed port to my PI.

7

And all network broadcast services will break :wink:

8

@dizzy, sorry but is that good or bad? I have now a DHCP-server in each subnet, can I expect any problems?

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