• 10 Posts
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Joined 1 year ago
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Cake day: June 19th, 2023

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  • 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.


  • OpenBSD is the most pleasing expérience I’ve had with an OS. It’s fully contained and has all the tools you need without needing to install anything (eg a DNS, HTTP, SMTP servers, a proxy, a good firewall). All config files look alike and use the same keywords for the same things, making it straightforward to configure everything.

    And regarding RAID 1, I’ve never done it myself, but it totally works out of the box (as well as full disk encryption).









  • ELI5

    So it’s saturday afternoon, a very hot one, so you ask your daddy for an ice cream (hosted service). The shop you go in is very bizarre though, as there is one vendor (TCP port) for each flavor (docker service/virtualhost). But it’s tricky because they’re all roaming in the shop, and you don’t know who’s responsible for each flavor. Your dad is also not very comfortable paying these vendors directly because they only accept cash and do not provide any receipt (self-signed certificate/no TLS).

    Hopefully, there is the manager (reverseproxy) ! This girl is right where you expect her: behind the counter (port 80/443), accept credit cards and has a receipt machine (Domain name + associated certificate). She also knows everyone on her team, and who’s responsible for each flavor !

    So you and your dad come to see the nice lady, ask for a strawberry + chocolate ice cream, and pay her directly. Once done, she forwards your request directly to the vendors responsible for each flavor, and give you back your ice cream + receipt. Life is good, and tasty !