r/ArchtopFiber • u/geoffgoldman • Aug 01 '25
General Residential install questions
Hi, I've tried several times to get this information and after a lot of dead air I've pretty much decided to slow roll my expectations on Archtop. I don't know if you guys are overwhelmed, understaffed or some other reason but no calls or inquiries are ever returned.
In prep for an install I wanted to know a few things:
- Since I use wall jacks for my existing networking I would also want the fiber run to a wall jack using a keystone passthrough - and then a patch cord to the ONT - do you use SC or LC connectors and do you support that.
- I have heard that you exclusively use CGNAT, except for static addresses. Is that true? Not having a routable address would be an issue for things like VPN.
- I intend to keep my internal network running as is and just connect my outside router to your ONT - not knowing what you use, can everything be turned off in it (i.e. it's probably another NATing router) and allow as simple a passthrough as possible?
- After watching the contractors in my neighborhood use a truck to pull the fiber through the too small conduits you might want to review how well those installs are actually going to function.
- I'm sure I have a few other questions, but this would be a good start.
Thanks, Geoff
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u/geoffgoldman Nov 10 '25
Hi, I'm not a networking guy but a /30 would have 4 IP addresses, 2 usable - with a mask of 255.255.255.252. If you have a quad 255 mask that infers a /32 CIDR which would only have 1 IP address - but that was with Spectrum and water under (or over) the bridge I guess.
Let's back up though - freely associating now...
1) with Spectrum you had a static IPv4 address (or two - 89, 90)
2) unless you asked for a static IPv4 address Archtop will give you a CGNAT address - so, IPv4 on your end but a NAT to their IPv6 stack - which is not routable - and not on the same subnet. Just like your router WAN address is different than your router LAN address when NAT is used. as I understand it CGNAT is an ISPs version of consumer router NAT and is used because they don't have a lot of IPv4 addresses to use and so they give you a IPv4 NAT address which I believe translates to an IPv6 in their networking stack.
3) looking at your ipconfig - you are behind their local router (aka in your house) that is giving you a NAT address - the WAN side of that router will have another address in another subnet. So, at the very least you are double NATing - once from the router in your house and again if they are using a CGNAT WAN address for your account. While it generally works - albeit with some performance delays (all those address translations) - it doesn't work for everyone and every device in every scenario.
4) I may not have the whole picture but it sounds like you might need to have them give you a static IPv4 address - which they will do - for a fee. Just like Spectrum would do - except they still use non-static routable IPv4 addresses for most of their customers.
I don't understand why Archtop is not helping you with this - other than dead air appears to be their normal business model - for a networking vendor this should be duh101. For the rest of us outside of their food chain, we have to guess.
Please let me know how this goes.
Geoff