Hi,
I’ve been trying to work out my network architecture with the pieces i have today:
- isp box with 10gig dac downlink, 4 ssd bays
- pfsense box with dual 10gig dac card
- switch with 10gig dac uplink and multi gig rj45
- main proxmox host
- other devices (laptops, iot…)
ive ran into a dilemma regarding switching my isp box to bridge mode:
- if i do, i lose wlan and nas capabilities
- if i dont, i have to contend with double nat
i’m sure that eventually i will get an ap (maybe unifi) and a dedicated nas (either home built or something like synology or asustore), but for the moment, i want to keep cost down and gradually add new pieces
i was wondering if double nat is of huge performance and maintenance implications, or if i would be okay running this setup for a few months until i get to add an ap and nas?
thank you
If it’s double NAT where you have control over both boxes, it’s not that big a deal. First of all, it only matters at all if you’re trying to forward ports for remote access to your services, in which case you just need to add two port forwarding rules for each service, instead of one, one in each firewall. Alternatively if the ISP router allows it, see if it has a 1:1 NAT feature, this way it forwards ALL the ports to your private router, where you can then be selective about which ports to allow.
Alternatively, if you’re not trying to host services on your LAN for public access and consumption (Which would be a bad idea at this point in time anyway given your level of knowledge) don’t worry about the NAT or port forwarding at all and just use a mesh VPN like Tailscale (Optionally with the self hosted control application Headscale) and use that to access your services which outside home securely.
Some routers will call the 1:1 NAT feature, “DMZ” (Short for Demilitarised Zone). The idea is that you just act as a pass-through, in this case, “passing through” the external internal to the internal router.
No issues with double NAT. I even had a setup with an internal and external net, and the provision that any network link originating from (not passing through) the outer NAT router would raise an alert on the inner NAT router - which would simply switch the outer NAT router off.
Double NAT with DMZ.
Those SIP ALGs are more trouble than they are worth. If you are using SIP devices, use a different outbound port on each device (eg: 5060, 5061, 5062).
Yes.
If you’re using double NAT, you’re doing something wrong. If you want to do it right, stop using double nat. If that doesn’t matter to you, and you’re comfortable supporting a broken-by-design network, do it.
I’m going to briefly explain why I downvoted… this (I feel) is an unhelpful comment that doesn’t explain anything. You say, “[if] you’re comfortable support a broken-by-design network, do it.”, but you don’t explain why it’s a broken-by-design network.
I’ll say - I agree with you, but the comment doesn’t actually enhance the conversation and comes off as abrasive and unhelpful. If I’m looking for information, I’d rather be given education (Even if it’s just a, “Go here for why you don’t do that!”), not just a, “Don’t do it” with no assistance and help for how to do it right.
If you don’t understand why it’ss broken, I guess that’s on you. If you’re to tbe point op is in terms of their needs, network topology etc and you still don’t understand the fundamentals, what do you expect me to say to resolve that? If you’re OK with supporting your broken, incorrectly configured network, then by all means. If you are not, then expect the answer from those you’re asking for help from to be “fix your shit”. Do not expect anyone to educate you. It’s like arguing with creationists - you picked this dumbass thing to get behind, I’m not on the hook to explain basic logic to you.
