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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Openvpn replay attacks
I've noticed a lot of discussion around this topic.
Just to clarify, I'm not experiencing heavy load.
I wouldn’t jump to conclusions about it being a badly configured server since it’s not a frequent ...
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How can there be incoming connections when using a VPN?
I've the following nftable configuration (/etc/nftables.conf) to enforce a "VPN kill switch". Except for ICMP and IGMP, connections are only allowed through tun0. This works well as a "...
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How does TLS-CRYPT-V2 work in OpenVPN?
I am configuring an OpenVPN server and I would like to use TLS-CRYPT-V2. For that, in the documentation, it is said that I have to create a TLS-CRYPT-V2 key for the server and one for each client, ...
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If someone has your VPN password and email address, can they decrypt your VPN traffic?
VPN encrypts your traffic all around. So let's say someone knows your VPN email/password. Would this give them the ability to decrypt all your communications?
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Is this openvpn auth script secure or am I'm just being too naive?
I'd like to setup an openvpn server so that clients either use a certificate to
authenticate or send username & password. In certain situations I don't want to
issue a certificate for clients and ...
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How to block 192.168.0.1 for connected clients?
I installed Raspberry Pi OS on a RPi 3B, then I installed NetworkManager, set the Ethernet connection to "Shared to other computers" and connected an ethernet cable between the RPi and a ...
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Do I need an IP whitelist on top of a VPN?
My company requires me to access resources through a VPN connection -- specifically, an OpenVPN client configured to require a password plus an authenticator token. But the company also restricts ...
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Why do most VPN protocols work on the Transport Layer and not on the Network Layer instead?
In both the TCP/IP model and the OSI model, IPSEC offers encryption on the Network Layer (IP), while other VPN protocols such as OpenVPN offer it on the Transport Layer (TCP).
Due to encapsulation ...
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proxy anonymity level, what is the tehnical difference ? (specific example from hide my name)
By using hidemy name I can check for a proxy if it is up or down, and also check the anonymity level using the app. A sample result looks like this:
IP address Port Country, City Speed ...
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Not able to view a webpage or connect to a service on a VM connected using OpenVPN, only able to perform Nmap scans
I've tried asking this question in hack the box forum, but nothing has worked so far.
When I connect to a vulnerable machine using a tunneled IP using OpenVPN, all I'm able to do to a box is scan it (...
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OpenVPN & China's Great Firewall
The company I work for has an OpenVPN server so we can access its intranet from home.
The problem is that I'm going to move to China and I'll need to connect from there, but I've heard connections ...
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Why does the OpenVPN server need to keep client's private key?
When I installed the openvpn server following these instructions, the work flow was like below
Create ca.crt
Create server.key and cert
Create client.key and cert
As far as I know, when A and B are ...
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Does fragrouter work with OpenVPN?
My goal is to evade IDS/IPS detection and scan the target with nmap. If the scan is detected, the target seems to stop responding for 10s. I think that IP Fragmentation Attack is exactly what I need.
...
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Check for allowed OpenVPN SSL/TLS cipher suites from the client-side
I would like to check cipher suites that the OpenVPN server accepts. I used nmap:
nmap -sU --script ssl-enum-ciphers -p 1194 <IP>
but the results are only:
Host is up (0.0033s latency).
PORT ...
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OpenVPN algorithms configuration to allow only TLS 1.3
For my OpenVPN configuration, I have chosen only 3 symmetric ciphers: AES-256-GCM, AES-128-GCM, and also CHACHA20-POLY1305.
I don't have any fallback algorithm. I support only modern clients.
Is this ...
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Is key renegotiation necessary with a larger cipher in OpenVPN?
OpenVPN allows the use of their 'reneg-sec' option to renegotiate keys for the data channel at a specified interval. This helped protect against exploits like Sweet32 with 64 bit block ciphers a while ...
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How exactly does OpenVPN's tls-auth option apply HMAC to packet messages?
Update: I've been able to work out everything I was asking about packet structure when I was finally able to get Wireshark to work, but there is one last thing I'm confused on which I detail at the ...
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What is the impact of OpenVPN SECLEVEL=0?
OpenVPN throws a "signature digest algorithm too weak" error when I try to connect to a specific VPN.
A common suggestion for a workaround is using the following config:
tls-cipher "...
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Is providing a static TLS key during an OpenVPN handshake useless for commercial providers?
When using OpenVPN, tls-auth and tls-crypt are widely adopted options, allowing a static key to be used in the initial handshake. This helps prevent against DoS attacks, as without the valid key a ...
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How to decrypt an OpenVPN EasyRSA Encrypted Private Key?
I want to copy my OpenVPN configuration from a client configuration file to my pfSense firewall. pfSense requires me to provide certificate and key. This is how they look like in the .ovpn ...
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Best practices for securing SSH access? Is certificate-based VPN server a good solution?
I run a server on a hosting. I want to harden it, but ssh access is giving me a bit of concerns.
I usually access from home most of the times. I have a provider subscription with the usual DHCP setup ...
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VPS for Tor & I2P - which other services can I safely run on same?
I'm toying with the idea of setting-up a Tor node (middle/guard) and an I2P node on the same VPS. I think that should be safe(ish)...
But I'm wondering what other services I could run without it/them ...
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Can we double encrypt VPN traffic with a custom certificate?
I want to forward VPN traffic to an Internal Proxy that uses client certificates to authenticate users. Can we add this second encryption at the VPN Configuration file for example? Or what is the best ...
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What information is sent through companies VPNs?
I'm currently working at home. My employer provides me a VPN access to the company resources: intranet, ssh access to computers, etc. I was wondering what exactly means to use a VPN, and what type of ...
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Which OpenVPN cipher is the more secure?
From a security standpoint, which OpenVPN cipher should I use? I read online that AES-256-GCM is the most secure for OpenVPN but I prefer to have a confirmation.
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Is duplicating an OpenVPN server secure?
I read this tutorial to create an OpenVPN server, it worked perfectly and was configured correctly, using a dedicated server to create the certificates it requires.
Now I want to create a new OpenVPN ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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