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Turning off DHCP on ATT BGW210-700 Modem/Router
I just switched from another ISP with a separate modem and router to ATT Fiber to the combined modem/router unit. I have an Amahi Linux server that worked fine under the previous configuration, which entailed switching off DHCP on my previous router (which I still have) and letting the server manage the DNS. The new ATT setup seemed to be working fine with all my devices connected via wireless, except for the server which was directly connected to the modem/router. However, the server didn't show as a connected device on the modem/router and was unreachable by ping. I switched off DHCP on the modem router via the web app hoping that this would restore access to the HDA server, and promptly lost all internet access. With some fiddling I was able to switch DHCP back on and restore internet access, but I still have this problem of having a nonfunctional Linux server. Can anyone help me? I'm clearly out of my league here.
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baileyt2
Tutor
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4 Messages
5 years ago
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ATTHelp
Community Support
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231.7K Messages
5 years ago
Hi @baileyt2
Thank you for reaching out! Given the complexity of your issue, we recommend reaching out to our ConnecTech team for more advanced troubleshooting options. We hope this helps!
Aminah, AT&T Community Specialist
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ATTHelp
Community Support
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231.7K Messages
5 years ago
Hello again @baileyt2
That's great, we're glad you got it sorted out! Thanks for the update and enjoy the rest of your day!
Aminah, AT&T Community Specialist
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socalspartan
Contributor
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2 Messages
5 years ago
I have the same problem. I had turn the dhcp server back on on ATT bgw210 in order to get internet working. What did you change? I have enabled IP passthrough from the ATT bgw210 onto my netgear nighthawk. Its work but every time I try to turn of dhcp server on ATT bgw210, no internet. Could you tell me what setting you change? Is it on your 3rd party router?
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baileyt2
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4 Messages
5 years ago
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socalspartan
Contributor
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2 Messages
5 years ago
Ah I see. Did this resolved your double NAT problem?
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baileyt2
Tutor
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4 Messages
5 years ago
I’m not sure I understand your question, but my remaining issue is that my DNS does not resolve external hostnames. The strategy that has been suggested to me is to assign non-overlapping DNS IP ranges to both the ATT router and my Linux server (one range each). So, turning DHCP back on for the ATT router, and assigning a range for that, and doing same for a non-overlapping range on the server. That will be easy to do with the admin app for the router, but I’m a Linux neophyte so I’ll have to figure that out for the server. If I do and it works (or not), I will respond with an update. I’m traveling and won’t get to it for a bit.
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Jmhollid24
Contributor
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1 Message
5 years ago
Did you ever resolve your issues? I am having the same issues after converting from Xfinity to AT&T Gigabit with my Google Wi-Fi mesh setup. I went through all the steps and the last one was disabling DHCP on the AT&T router and no internet. How did y’all get back into the router to turn dhcp back on?
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bmlafhameyer
New Member
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1 Message
2 years ago
In reading through these posts, nobody here should be turning their routing off in the AT&T router without a clear understanding of how DHCP servers and IP scopes work on a network. Yikes...
Having two DHCP servers (Routers) on the same network without using managed switches along with VLANS will cause IP conflicts and a huge mess. Use either a DHCP server or the AT&T router to route IP addresses on your network. For those whom have servers behind the router, simply input a LAN scope that matches the static IP on your server, or change your server static address to match the LAN scope in your router. For those of you who have turned DHCP off and Have no internet is because you now have no DHCP routers handing out IPs to your devices. If you turned off DHCP and can't get to your router, statically assign an IP address from the previous range on your PC, then pull a browser open and navigate to the router LAN address. (Example: 10.0.0.1, 172.20.2.1, 192.168.0.1, 172.20.2.254)... Whatever the LAN scope was that you turned off, will still be statically assigned to the router.
EXAMPLE, Device NIC config for static: IP: 172.20.2.50; subnetmask: 255.255.255.0; Default gateway (router): 172.20.2.1....... then navigate to the 172.20.2.1 router address, or whatever the scope was set as for the LAN.
DNS is either LAN side translations or WAN side (Public). If you have a public static block from AT&T, WAN translations will be done by AT&T DNS external server, which the will give you those IPs. LAN translations will be either done by the AT&T router if youre routing there, or an internal DNS server if you have another LAN side router or DHCP server; it'll be done by an internal DNS server.
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