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I've waited a long time for AT&T Fiber to arrive in my neighborhood and it is finally here. Naturally I signed up as soon as I could and scheduled my fiber installation at their next available slot.
The installation went great. The AT&T technician, Richard, was very knowledgeable and was able to install the AT&T Gateway in my server closet on the other side of my house from where the fiber entered my home.
AT&T's default configuration is to leave you with working WIFI and you can connect to and start browsing the internet. This makes sense because most people do not wire their houses with ethernet.
As a software developer tech nerd, I'm not most people. My appetite for punishment lead me to wire my house for ethernet, at least for those devices that benefit from high throughput like my work computer and streaming devices.
Naturally, I have my own router with a custom configuration to handle all of that.
Additionally, this router needs to "live on the edge" as they say to handle some services that I host out of my own homelab.
What this means is I need to "bring my own router" to use with the AT&T Gateway that was installed.
To use your own router with AT&T's BGW320-505 gateway, you simply plug it into one of the yellow 1Gb ethernet ports on the back of the device. The blue 5Gb strongly recommends that you use CAT 7 ethernet, which I honestly thought was a made up category of ethernet but turns out I'm just too old to keep up with technology.
You then use a computer to connect to your AT&T gateway accessing the default address http://192.168.1.254 to see your Gateway settings.
Navigate to the Firewall
page, and then the IP Passthrough
subpage and do the following:
Allocation Mode
to Passthrough
to allow the AT&T Gateway to pass your WAN IP address to your own router.Passthrough Mode
to DHCPS-fixed
so you can specify your router as the client to receive the passed through WAN IP (rather than the first client that connects).Passthrough Fixed MAC Address
enter your router's MAC address which you can find on the back or side sticker physically attached to your router. You can also click the Choose from list
to see the list of connected devices; if it's obvious which device is your router, select it to automatically fill in the Manual Entry
box with your router's MAC address.After that, I restarted both the AT&T Gateway, and my own router and everything worked great!
Until...
When I woke up the next morning, nothing worked. I couldn't connect to the internet, I couldn't connect to the AT&T Gateway, and I couldn't connect to my own router.
I did the usual steps of checking my ipconfig
settings, ping
and tracert
but nothing seemed to work.
Oddly enough, email and a couple other apps would update with notifications as if it sort of worked, but everything was intermittent.
To connect to my AT&T Gateway, I had to explicitly connect to the default WIFI and then everything from that computer worked; I could browse the internet, reach the router etc.
I finally found AT&T's article on how to use your own router and that helped me fix the issue.
The key issue for me was that AT&T's Gateway used the same subnet 192.168.1.0/24
as my own router's subnet.
Even though the ranges didn't overlap, the power struggle was real and cause all sorts of issues.
The key point from AT&T's article was this:
After I read that, resolving the issue was as simple as changing the default subnet for the AT&T Gateway.
Follow these steps to resolve the subnet conflict.
Home Network
tab.Subnets & DHCP
sub page.Device IPv4 Address
to use a different IP address, for example 192.168.3.254
.192.168.3.x
, so enter the value 192.168.3.64
. Notice here, I'm only changing the third octet.192.168.3.253
.I restarted both my AT&T Gateway and my router, just for good measure but I don't actually think it's necessary.
After I made the above change, everything started working.
Since I already had a WIFI Access Point, I wanted to avoid having the AT&T Gateway Access Point WIFI radio's from interfering, so I went ahead and turned them off.
Home Network
tab.Wi-Fi
sub page.Advanced Options
click to see more options displayed.Wi-Fi Operation
to Off
for the 2.4 GHz Wi-Fi Configuration
.5 GHz Wi-Fi Configuration
section, I set Wi-Fi Operation
to Off
.Save...
button.Continu.
button to disable the Wi-Fi radios on the AT&T Gateway.Thanks for reading and I hope you found this article useful if you run into the same issues connecting your own router to an AT&T Gateway.
Special thanks to this YouTube video as well which confirmed what I thought need to be done to use my own router.
If you found value in this post, consider following me on X @davidpuplava for more valuable information about Game Dev, OrchardCore, C#/.NET and other topics.