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[Discuss] Changing Comcast Modem to Bridged
- Subject: [Discuss] Changing Comcast Modem to Bridged
- From: jbk at kjkelra.com (jbk)
- Date: Sun, 30 Dec 2018 10:39:06 -0500
A couple years ago we changed to comcast as our ISP and incorporated their modem into our network topology providing the dhcp, NAT and wireless functions. Prior to this we had a DSL modem and WRT54G running tomato. The modem provided dhcp so it was the gateway address. I now want to put the Comcast modem in bridge mode and have my wireless router running dd-wrt provide the dhcp and NAT for the wireless and wired LAN. According to the research I've done there are only two ip address options for setting up the modem in bridge mode. 10.0.0.1 or 192.168.100.1. My current network subnet mask is 255.0.0.0 for the dozen or so devices that have static IP's. I do not provide any services outside the local LAN but within I have a backup server that serves a number of devices. As I understand it the modem IP in bridged mode wants to be on a different subnet that the internal LAN which would lead me to believe that the 192 prefixed IP address would be the choice, this is question #1 Once I've setup the modem with the correct IP then will the router now become the gateway? I have the Cisco DPC3941T modem, has anyone on here set up the bridge themselves, I see the option in the management GUI, or per my web searching this change can only be done correctly by the right Comcast personel remotely? Well that's the gist of it, did I leave out anything? -- Jim Kelly-Rand jbk at kjkelra.com
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