Question
How to access a web server running on the same server as OPENVPN
- Posted on September 24, 2020
- VPN
Asked by andrewellis
Hi I am accessing the internet from home through an openvpn server running on a digital ocean droplet. I also set up a web server on the same droplet.
Now if I try and ssh to the IP address or access the IP address through the VPN the various commands/accesses just hang.
If I turn off the VPN I can access everything just fine.
I appreciate this is probably something to do with routing on the droplet site. I’d be grateful if someone could give me a pointer as to what I need to do to enable access through the vpn and from another machine without the vpn. Thanks Andrew
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Hi,
I think your issue may be related to firewall’s NAT settings on VPN server side. I changed my VPN configuration to simulate yours. Now it looks like in the diagram below.
Internet
|
|
------------------ ------------------
| DO Droplet 1 | 10.8.0.0/24 | Home Office |
| (CentOS 8) |_________VPN_______ | ISP's router |
| Internet gateway | \----| Internet gateway |
| VPN Server | \ ------------------
| Front-end Server | \____ |
------------------ | |LAN 192.168.0.0/24
| | |------------
|VPC | | |
|10.106.0.0/20 ------------- |
| | PC 1 | |
----------------- | VPN Client/ | |
| DO Droplet 2 | | VPN Gateway | |
| (Ubuntu 20.4) | | (CentOS 7) | |
| VPN Access | ------------- |
----------------- |
------------- |
| PC 2 | |
| VPN Access |--
| (Windows 10)|
-------------
I can ssh Droplet 1 and get a website served by its from my home office network. VPN channel is up, of course, and I use droplet’s public IP address.
I have installed and configured nftables on Droplet 1. My NAT settings for the traffic outgoing from VPN network to the Internet looks like that:
set masq_interfaces_vpn {
type ifname
elements = { "tun0" }
}
set masq_ips_vpn {
type ipv4_addr
flags interval
elements = { 10.8.0.0/24 }
}
chain outgoing {
type nat hook postrouting priority 120; policy accept;
iifname @masq_interfaces_vpn oifname != @masq_interfaces_vpn masquerade
ip saddr @masq_ips_vpn masquerade
}
I hope it will get you closer to solving your issue. I probably could help you more if I knew more details of your configuration.
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