this post was submitted on 02 Feb 2024
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23
Setting Up a Secure Tunnel Between Two Machines (lemmy.world)
submitted 9 months ago by [email protected] to c/[email protected]
29 comments fedilink hide all child comments
 

I have two machines running docker. A (powerful) and B (tiny vps).

All my services are hosted at home on machine A. All dns records point to A. I want to point them to B and implement split horizon dns in my local network to still directly access A. Ideally A is no longer reachable from outside without going over B.

How can I forward requests on machine B to A over a tunnel like wireguard without loosing the source ip addresses?

I tried to get this working by creating two wireguard containers. I think I only need iptable rules on the WG container A but I am not sure. I am a bit confused about the iptable rules needed to get wireguard to properly forward the request through the tunnel.

What are your solutions for such a setup? Is there a better way to do this? I would also be glad for some keywords/existing solutions.

Additional info:

  • Ideally I would like to not leave docker.
  • Split horizon dns is no problem.
  • I have a static ipv6 and ipv4 on both machines.
  • I also have spare ipv6 subnets that I can use for intermediate routing.
  • I would like to avoid cloudflare.
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[–] [email protected] 2 points 9 months ago

Keeping the source IP intact means you'll have troubles routing back the traffic through host B.

Basically host A won't be able to access the internet without going through B, which could not be what you want.

Here's how it works:

On host A:

  • add a /32 route to host B public IP through your local ISP gateway (eg. 192.168.1.1)
  • setup a wireguard tunnel between A and B
  • host A: 172.17.0.1/30
  • host B: 172.17.0.2/30
  • add a default route to host B wireguard IP

On host B:

  • setup wireguard (same config)
  • add PAT rules to the firewall so to DNAT incoming requests on the ports you need to 172.17.0.1
  • add an SNAT masquerade rule so all outbound request from 172.17.0.1 are NATed with host B public address.

This should do what you need. However, if I may comment it out, I'd say you should give up on carrying the source IP address down to host A. This setup I described is clunky and can fail in many ways. Also I can see no benefits of doing that besides having "pretty logs" on host A. If you really need good logs, I'd suggest setting up a good reverse proxy on host B and forwarding it's logs to a collector on host A.