Just had AT&T Fiber installed and it comes with Arris BGW210-700 modem/router gateway which must be used, does not have bridge mode, closest thing being IP Passthrough, or so I have read.
I have found several "guides" online on how to setup the IP Passthrough (https://www.linksys.com/us/support-article?articleNum=293959). I still have questions and would also appreciate any help if I show any misunderstanding in the following:
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put Arris in IP Passthrough mode
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select DHCPS-fixed
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manually enter the MAC address of the Linksys WRT1900ACS (which is currently running openwrt) into the "Manual Entry" box
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connect Arris and Linksys together. LAN port on the Arris, WAN (internet?) port on the Linksys.
Questions:
i) Besides typing the MAC address of the Linksys in the "Manual Entry", do I also need to select the Linksys from the device list? There's no mention of that in the above instructions
ii) I have read in other "guides" that the Arris and the router behind (in this case the WRT1900ACS running openwrt) cannot use the same IP range. Arris gateway is at 192.168.1.254 (so does that mean it uses 192.168.1.X range?) and the WRT1900ACS uses 192.168.1.1 (so does that mean it also uses 192.168.1.X range?). If so, then I need to change the IP range of the WRT1900ACS correct? How?
Thanks!!