Hi folks, I would like to ask some advice on how to configure my network. I am using an ISP(Webpass) does not provide public ipv4, hence, my home VPN server is not accessible from many networks(which does not support ipv6).

What I did is using a linux server on Google Cloud as VPN server, and I initiate a VPN connection from my home server to this remote cloud VPN server.

Now if I connect to this VPN server from my laptop, I can SSH and connect to "this particular" home server, which joined the VPN network. For the rest of devices, there is no route to the host, although I tried to add a static route.

My question: is server a way I could use this VPN to establish a channel, so that all my computers in home network can be accessed from the laptop joined the VPN server?

Thank you very much

My topology:
Laptop. ------------ Remote VPN server ---------Home Server -------Home Network VPN
192.168.1.100 ------<-ppp0-------ppp1->--------192.168.1.101--------10.5.1.1/24
--------------------------------------------------10.5.1.2 in home network

anyone has any idea or suggestion? maybe I didn't explain clear enough?

I'm not clear about what your trying to do beyond the fact that you have a laptop and server connected to a common remote VPN server. Are you also trying to share the VPN connection via your laptop? Why don't you set up a router to initiate the VPN connection and put the hosts behind that router? Some more clarification probably necessary here.

What protocol do you use for VPN, IPSec?

I am using xl2tp over IPSec.

End goal trying to access my home network(all machines) via a VPN server sitting on AWS. My problem with ISP is I am not assigned with a public accessible IPv4, so I cannot VPN back to my "router" or "VPN server hosted behind router" directly. I am thinking if it is feasible to VPN into this AWS hosted server, from laptop(say at work), and from a server at home. Then I would have a ppp0 and ppp1 interface on the VPN server. Maybe I could add some "bridge" or "static route", so that I could bring my home network accessible?

hope above explanation is clear

Set up packet forwarding on the cloud-based VPN server, then you should be able to route traffic between the two networks.

https://tecadmin.net/enable-ip-forwarding-linux/

Thanks!! I think I already have this setting on the VPN server. However, when I try to access a desktop in my home network other than server(which login the VPN server), I got no route to host error.
Laptop : assigned 192.168.1.2 by VPN server
Home server: assigned 192.168.1.3 by VPN server, 10.5.1.2 on home network
Home desktop: 10.5.1.3

I could ssh into the home server from laptop with 192.168.1.3 IP, but not able to ping or SSH 10.5.1.3. I added a static route of network 10.5.1.0/24 via ppp1 interface, but seems it is not helping. Do I need to add anything to the home server network configuration?

So your home server is acting as a router. Does that have IP forwarding enabled?

Does VPN server tell Laptop how to route 10.5.1.1/24 network's traffic? You might need add a static route on Laptop to indicate how to route 10.5.1.1/24 traffic.

after adding 10.5.1.0/24 as static route on vpn server, i could use server's ip(local to home) 10.5.1.2 to connect. However, other IPs (10.5.1.3) is not accessible.
Many said it is b/c p2p tunnel does not understand network(only point ip), so feels like i need to make a tunnel on top of the p2p tunnel.

If possible, it is better to move 192.168.1.100 p2p between Home Server and Home Network VPN.