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by comboy
2024 days ago
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Which is then a problem when you try to explain them that yes, you are sure the issue is with their service and not your setup. But what's your reason to be going such lengths instead of just plugging UDM into their router? Unless it was done for the fun of it which is fine and understandable. |
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While you can do this and things will generally work, AT&T restricts all of their residential gateways from operating in a true passthrough/bridge mode to another router. So you end with double NAT and all the joys that entails (such as [1]). There are also a number of other issues that have been associated with operating in their faux-passthrough mode, including
- Issues with IPv6 prefix delegation
- Sporadic latency spikes (an issue in general, that you inherit since the gateway is still "doing" everything it normally would, since it won't actually act as a ure passthrough/bridge)
- A firmware update capped throughput at 50Mbps (later fixed in another firmware update)[2]
- Firmware updates tend to silently re-enable the built-in wifi radios
So while it'll generally work, it ends up problematic. You inherit all of the performance issues associated with just using the gateway as your all in one modem/router/firewall/AP/gateway, plus the addition of double NAT, plus the sharp edges of their poorly implemented faux-passthrough modes, plus the ever-present concern that you're one firmware update away from a non-working network despite having used their official passthrough configuration.
Hence why gateway bypasses are so popular[3][4][5][6]. Even if they're a bit involved to set up, once you get it working things just... work. With little if any upkeep (potentially a few minutes after a power outage, depending on the bypass method you implement).
[1] https://www.windowscentral.com/fix-xbox-one-double-nat
[2] https://www.dslreports.com/forum/r32172124-AT-T-Fiber-5268AC...
[3] https://github.com/MonkWho/pfatt
[4] https://github.com/bypassrg/att
[5] https://github.com/mrozentsvayg/vyos.att
[6] https://github.com/Hou-dev/simple-eap-proxy