this post was submitted on 03 Jan 2024
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11
Issues forwarding traffic through a wireguard connection (self.selfhosted)
submitted 10 months ago* (last edited 10 months ago) by sxt to c/selfhosted
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I am attempting to follow this https://www.procustodibus.com/blog/2022/09/wireguard-port-forward-from-internet to forward traffic from a few ports on a public oracle vps to other ports on my local server through a wireguard connection. Currently I am doing this using rinetd, but I was looking for a more normal way of forwarding traffic. (Also looking to forward UDP traffic at some point.)

After stopping rinetd, adding these rules to the public server's wg config

# packet forwarding
PreUp = sysctl -w net.ipv4.ip_forward=1

# port forwarding
PreUp = iptables -t nat -A PREROUTING -i ens3 -p tcp --dport 443 -j DNAT --to-destination 10.144.65.2:8443
PostDown = iptables -t nat -D PREROUTING -i ens3 -p tcp --dport 443 -j DNAT --to-destination 10.144.65.2:8443

# packet masquerading
PreUp = iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE
PostDown = iptables -t nat -D POSTROUTING -o wg0 -j MASQUERADE

and restarting the wg connection, I'm seeing traffic on the ens3 port but none entering wg0 via tcpdump. I feel like I probably have conflicting iptables rules saved https://pastebin.com/0eNwhNKM but I don't really know enough about whats going on there to fix it. I feel like its probably the wireguard-*-rule ones (created by pivpn possibly?) but I'm not sure.

Edit way later: Ended up just using rinetd for the udp connections. Ubuntu doesn't include the latest version here https://github.com/samhocevar/rinetd which is able to do UDP connections. The docker container RxBrad suggested uses that version within the docker container to make the redirections so it will be roughly equivalent.

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