Questions tagged [openvpn]

An open source virtual private networking application written by James Yoan and published under the General Public License (GPL).

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39 views

Stronger OpenVPN encryption needs higher spec server? [migrated]

I am testing my OpenVPN server (Debian 10, 1 CPU core, 2 GB RAM) I want to use stronger encryption. But I feel network speed is slow with a stronger encryption cipher (SHA512, AES-256). If I change ...
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2answers
70 views

Can app / service provider konw when its user using (selfhost) VPN server?

Let's say I setup openVPN at home, then I go out. I connect my ios with openVPN server at home, then I download Netflix app. then I turn off location and any necessary tracking feature on ios. I ...
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30 views

OpenVPN bridge - using same interface for internet connection

For setting a vpn connection in bridge mode using openvpn, the documentation of OpenVPN for configuring a bridge mentions that the OpenVPN client must have at least two Ethernet interfaces, one ...
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67 views

OpenVPN client suddenly refuses to connect to my self-hosted VPN

It's been working fine for years, but now suddenly I'm getting a strange error. Does anyone know what problem this points to? OpenVPN Connect Version 3.0.2 (598), error logs: [REDACTED IPs] 5/16/2021,...
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1answer
131 views

Can my company track my laptop if I've reinstalled the operating system?

I was given a laptop by my company. I reinstalled everything and now I occasionally open Whatsapp web in the background to reply to messages. Most of the times my laptop is connected to the Company's ...
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1answer
110 views

VPN doubt about “encrypting” an IP address

According to Kaspersky Encryption of your IP address: The primary job of a VPN is to hide your IP address from your ISP and other third parties. This allows you to send and receive information online ...
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2answers
106 views

Using iptables to set up a killswitch for openvpn: DNS requests are blocked but they shouldn't

I bought a subscription to a VPN service and I am using the openvpn 2.5.1 client to connect to it. I am using Ubuntu 20.10. I now want to emulate the "kill switch" feature of most ...
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34 views

OpenVPN certificates vs. SSO with MFA

I am wondering, is using certificates with OpenVPN gives any advantages vs. using SSO with MFA to authenticate to OpenVPN? Are there any disadvantages for combining both?
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46 views

Does an OpenVPN client attemtping to connect a wrong server IP poses a security risk?

I have an OpenVPN server setup at home and the public IP address I get from my Internet Service Provider is dynamic, not fixed. In the configuration file of a VPN client, the IP address of the server ...
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1answer
63 views

Internet privacy, VPNs, etc. Am I anonymous? [duplicate]

I am a member of a forum that recently disabled my account because their system picked up another account from my household. Anyways their terms of rectifying the situation are pretty invasive to my ...
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1answer
46 views

Limiting VPC subnet access for NAT OpenVPN clients

I'm currently testing OpenVPN to give developers limited access to AWS VPC's. Assuming I have 3 VPC's... VPC-A, VPC-B, VPC-C, each of these with private and public subnets. The OpenVPN server will be ...
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30 views

Firewall rule such that I can only acess a website with VPN

I want to create a firewall rule such that I can only access a Website with VPN enabled. But I can't seem to find an option in windows firewall to say if my protocoll is not openvpn I can't access the ...
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1answer
107 views

Mixing VPN Protocols

Is there any benefit to mixing vpn protocols as far as obfuscating your traffic. Would a multiple hop setup like (openvpn(server1) + wireguard(server2)) be better or is (openvpn(server1) + openvpn(...
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0answers
46 views

Openvpn not hiding dns, using tcp

I am using same configuration files for OpenVPN, same operating system (ubuntu 20) on two different laptops, but I notice with Wireshark, then on one of them, the VPN connection goes through UDP, ...
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70 views

Routing a site-to-site VPN through my regular VPN service

currently engaged in live competitive red vs blue team exercises in an enterprise style Windows AD environment. My device runs a modern Debian Linux OS. cscotun0 We typically connect to the lab/domain ...
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42 views

Difference between IKEv1 and IKEv2?

Can someone tell me the difference between IKEv1 and IKEv2 in terms of security functionality? Wherever I refer it was mentioned as IKEv1 has 9 messages while IKEv2 has 4 messages, IKEv2 has less RTT ...
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1answer
117 views

How VPN works internally [closed]

The VPN is used to establish a secure connection (creating a tunnel) to another network over the Internet. It masks our IP address and geographical location and also when the information enters the ...
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1answer
495 views

How does openvpn work for only certain servers?

I got a *.openvpn from work and I monitored the traffic on wireshark. On my normal vpn every traffic is routed via the vpn (as expected). But with this work vpn only the traffic that uses the work ...
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60 views

Undetectable Proxy or VPN Protocol

Is there a safe way for creating a proxy, tunnel, or VPN that cannot be detected by the datacenter or ISPs? I'm living in an oppressing country, but I've access to a VPS with less regulated access to ...
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189 views

OpenVPN: test security from external point of view

How would I test an OpenVPN environment from external, kind of black box pentest. I have the public server-IP (port 1194, udp, tun). I have found NO online ressources on how to do that, or whether ...
3
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1answer
373 views

OpenVPN Key Size 1024 vs 2048 and Eavesdrop vs Access?

OpenVPN recommends using a 2048 RSA key size for greater security, however, the hardware I'm using is somewhat weak and defaults to using a 1024 RSA key size. I'm trying to determine if it's worth ...
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4answers
5k views

Using OpenVPN on Windows instead of VPN apps: missing certificate

Sorry this might be a noob question, but I subscribed to a VPN provider which ships its own app on Windows. Now I thought I'd prefer to use the OpenVPN client app instead. I create a profile by ...
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104 views

How secure is /dev/stdin in UNIX systems?

Is decrypting secrets with ccrypt and piping the result via stdin to openvpn secure? I've written the following alias to start an openvpn client more easily than before: sudo bash -c 'cd ...
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1answer
72 views

Which methods should I connect a VPN, via that-vpn-app or through an VPN configuration on network manager linux?

I saw there are 2 available methods (that I know of and currently focusing on) to connect to a vpn. The first one is through their application based of that vpn provider. The others is by configuring ...
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4answers
177 views

How to avoid leaking your public IP to installed applications like browsers when using a vpn?

What is the easiest setup to hide your public IP from installed applications and prevent things like WebRTC leaks on a common Linux distro?
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1answer
30 views

Combine router VPN with Client VPN

I would like to combine my router's default VPN with another one I run on my laptop. Here is what I currently have : Here is what I would like to have : Both router (DD-WRT) and laptop use OpenVPN ...
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1answer
63 views

When pushing a DNS resolver to an OpenVPN client, does the resolver see the IP address of the client or the OpenVPn server?

When configuring an OpenVPN server, you have the option of pushing DNS resolvers to the client - like so: push "dhcp-option DNS " If this approach is used and a public DNS resolver is defined, will ...
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1answer
336 views

ecdh-curve and tls cipher do not work together

most of my question are already answered by reading in this forum, but "one last thing" is still open. I am running a OpenVPN server with the following security characters: SERVER (Raspbian Buster)...
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1answer
132 views

Antivirus/DPI Solution with openvpn server

I wish to set up a system that I log into with openVPN on my Raspberry Pi 4. I have already set up an openVPN server with a PKI infrastructure as well as other services that run on the Pi (like pi ...
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1answer
1k views

Block WireGuard clients' access to specific websites

I have installed a WireGuard VPN server on a Raspberry Pi (running Raspbian) using PiVPN and I would like to either block the VPN clients to access specific websites (i.e. block them access https://...
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101 views

Opening OpenVPN to the world

I built my own private network with OpenVPN. I bought a VPS at hosting provider A(closer to home) and another two at hosting provider B(cheaper). Using openvpn I connected the two to the OpenVPN ...
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2answers
150 views

Meterpreter Session over OpenVPN [closed]

Last month I made a pentesting course and now they opened a lab for us to practice before we apply for the certification exam. We connect to the lab over OpenVPN in our Kali Linux machine. I'm trying ...
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1answer
294 views

Does OpenVPN encrypt my traffic between my computer and VPN server?

I set up my own VPN by installing OpenVPN on a Ubuntu server, then I download client.ovpn file from Ubuntu server to my Windows laptop. And then, I import that client.ovpn to OpenVPN GUI app on ...
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1answer
670 views

Which VPN offers more security conceptually, SSL VPN or L2TP/IPSEC?

Aside from possible implementation bugs, which VPN concept aims to offer more protection by design? SSL VPN (implementation example - OpenVPN) L2TP/IPSEC (implementation example - Strong Swan) After ...
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1answer
110 views

Can't tell If The OpenVPN Server I Setup Is Encrypted using Wireshark?

This might sound dumb, but I set up an OpenVPN server on a Synology NAS. When I connect via the client at home to the server, everything works for. I know you can read packets in Wireshark. If I ...
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1answer
923 views

How to generate an OpenVPN 4096 or 8192 bit static key?

How to create an OpenVPN static / pre-shared key with key size 4096 or 8192 bit? openvpn --genkey Creates 2048 bit strong keys only. Static key. Not CA.
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1answer
444 views

How can I hide my mac address when using a public wifi? [duplicate]

As a new student of cyber security, I have started to see in real-time how an individual can actually scan and view the mac addresses on a public wifi connection. How can I hide my mac address when ...
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1answer
604 views

Wireguard vs. OpenVPN [closed]

Which is better in what scenario? What cons and pros do they have? (optional question) Which is more secure? (optional question) Best use case of each one? Isn't WireGuard based on OpenVPN?
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1answer
618 views

Tunnel Openvpn traffic through ssh?

I know similar question have been asked but none of them are explained thoroughly. I have setup a VPS and setup openvpn using https://github.com/Nyr/openvpn-install on tcp and port 443(I have access ...
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1answer
88 views

If I use a VPN, can an enterprise proxy insert itself in the middle?

I'm using the guest Wi-Fi at a large corporation, and connecting to a commercial VPN provider via the OpenVPN client. I do not know one way or another if a proxy is used on the guest wi-fi, but I ...
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1answer
485 views

For security purposes, can I use vpn with ufw to allow traffic only from the vpn on ubuntu?

Is this possible? If not through ufw then some other software or iptables? How should I set up the ip tables? Assuming my public ip is known (and I don't want to change it), would it provide complete ...
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1answer
3k views

how to force openvpn client to use TLS instead of SSL connection [duplicate]

i'm trying to use openvpn client to connect TLS VPN server here is my .ovpn file client tls-client dev tun proto tcp remote example.com 443 resolv-retry infinite auth-user-pass persist-key ...
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1answer
194 views

Is it safe to use RPC with sensitive data through an encrypted VPN connection instead of SSL/TLS?

I have an application where there I'm planning the following setup: user <-----------------> layer 1 server <------------------> backend server internet (https) ...
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1answer
514 views

What's the drawback of enabling auth-nocache in OpenVPN?

Using a "default" configuration, OpenVPN clients show the following warning when connecting to a VPN server in red, attention-seeking letters: WARNING: this configuration may cache passwords in ...
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2answers
3k views

What are the risks of installing a CA on the same machine as OpenVPN server?

Digital Ocean states in one of it's tutorial about OpenVPN server : While it’s technically possible to use your OpenVPN server or your local machine as your CA, this is not recommended as it ...
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1answer
410 views

Meterpreter and OpenVPN

During a meterpreter session, is it possible to deliver a payload that creates a connection request to a local OpenVPN connection? For example: I have a payload. Whenever that payload runs on the ...
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1answer
1k views

Are ARP attacks possible on OpenVPN and Wireguard connections?

I am curious if it is possible for users connected to a VPN to perform ARP spoofing / poisoning attacks against other users on the same subnet of an OpenVPN or Wireguard server. Does OpenVPN & ...
2
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0answers
99 views

Loosing internet connection while connected to specific VPN server?

I have noticed a strange behaviour earlier today on my VPN on a specific server. When I run a trace route command while connected to VPN (on a specific countries server) my internet will not work for ...
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1answer
161 views

Is my VPN leaking or is this normal?

Hi when I am not connected to my VPN and do a route print I get one 0.0.0.0 entry in the Network Destination column. It has a gateway of 192..... When I connect to my VPN and do a route print I get ...
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0answers
658 views

Filter/Block OpenVPN clients' access to a specific website

As stated in the title I would like to restrict VPN clients' access to specific websites. More specifically, I push the route for 5 websites to the clients via the server config. However, I would ...

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