[ale] AT&T fiber and IPv6?

[James Sumners (ALE)]

Let’s assume I’ve only ever picked up fiber cable and never actually installed or managed a network with it. From your diagram, I am picking up that the ONT is the device where the fiber terminates in my house, and the ER-4 is an Ubiquiti Edge Router.  

I am likely to be getting an Ubiquiti UDM Pro to replace my pfSense box (given that I no longer need to care about tracking total bytes across the WAN interface). This gateway device has SFP+ ports. Would those factor into your diagram in any way?  

How does using the AT&T gateway device as an authenticator only device change the IPv6 reliability?

On February 13, 2022 at 09:43:29, Derek Atkins (derek at ihtfp.com(mailto:derek at ihtfp.com)) wrote:

> Just a small correction -- while AT&T does require their box to be online
> for 802.1x authentication, you can absolutely design a network where the
> AT&T box is not in the data path! Indeed, I've done that here. Basically
> my network looks like:
>  
> --fiber-- [ONT] ---- [ ER-4 ] --- LAN
> |
> [AT&T Box]
>  
> Using EAP Proxy and some firewall rules allows this to work and -- viola
> -- AT&T box is no longer involved in your day-to-day data usage.
>  
> -derek
>  
> On Sun, February 13, 2022 9:23 am, James Sumners \(ALE\) via Ale wrote:
> > Sounding a lot like I’ll be hoping Comcast actually tries to compete now
> > that AT&T has brought actual broadband to my area. 😔
> >  
> >  
> > On February 12, 2022 at 19:17:58, Bryan L. Gay (ale at bryangay.com) wrote:
> >  
> > I had both Comcast and AT&T Fiber for years in Kennesaw. I was never able
> > to get IPv6 delegation working reliably on AT&T, even after they stopped
> > doing 6rd. I have Comcast now at the new place, 1.2Gbps downlink, and have
> > never had an issue with Comcast's IPv6. AT&T just never seemed to get
> > their act together. While having 1Gbps symmetric over IPv4 was great, and
> > it was less expensive, I'm happily on Comcast, now. AT&T requires you use
> > their gateway, which introduces other recurring problems. On Comcast, I
> > own my own DOCSIS dumb modem.
> >  
> > On Fri, Feb 11, 2022, 17:06 James Sumners (ALE) via Ale <ale at ale.org>
> > wrote:
> >  
> >  
> > Earlier today AT&T attached some fiber to the pole directly across the
> > street from my driveway. I’m sure it will take them another month or two
> > to activate the line, but I want to go ahead and solicit some knowledge
> > from you folks.
> >  
> > Currently, I’m on Comcast (plain residential). I despise the business, but
> > their network people are top notch and have rolled out a nice stable IPv6
> > network. They assign my WAN interface a `/128` and allow network
> > assignments via a `/64` or `/60` prefix delegation over DHCPv6. The `/60`
> > allows me to create multiple VLANs in my house for things like IoT devices
> > separate from my primary devices.
> >  
> > Does anyone have experience with AT&T’s IPv6 implementation? Would
> > switching to them be mostly transparent in this regard? Are there any
> > “gotchas” that I should be aware of?
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>  
>  
> --
> Derek Atkins 617-623-3745
> derek at ihtfp.com www.ihtfp.com
> Computer and Internet Security Consultant
>  

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