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I've been working on this for the past 6 hours and have made no progress.

The setup looks like this:

|Internet|---|Router1|---|Router2|---|LAN1|
                  |
                  |
                  L---|Router3|---LAN2

Problem: I want to restrict Router3 from seeing the other LAN while maintaining Internet access. Restrictions: Router 1 and 3 are on the 3rd floor. Router2 is on the first floor. Willing to completely reconfigure for an elegant solution.

Things I've Tried:

  • Different combinations of subnets
  • Plugging Router1 into the LAN port of Router3 (total connectivity loss behind Router3)
  • Inserted the following to Router2's /etc/storage/post_iptables_script.sh:

iptables -I FORWARD -m mac --mac-source 00:00:00:00:00:00 -j DROP (Where 00:00:00:00:00:00 is Router3's MAC address)

Router Information:

Router1:
Model: DGL-4300
IP: 10.1.1.11
Subnet: 255.255.255.0

Router2:
Model: RT-N56U
IP: 10.1.1.1
Subnet: 255.255.255.0

Router3:
Model: DGL-4300
WAN IP: 10.1.1.200
WAN Subnet: 255.255.255.0
LAN IP: 192.168.0.1
LAN Subnet: 255.255.255.0
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