> As an example, imagine that you are a moderator on a forum and you suspect that a new face is actually a sockpuppet of a user you banned the day prior. You check the IP logs, and despite using different Mullvad servers, both accounts resolve to the overlapping float ranges 0.4334 - 0.4428 and 0.4358 - 0.4423. This gives you a >99% chance that they are the same person.
This sounds like how I'd design a VPN if I were an intelligence agency.
It's a game of cat and mouse. The service keeps banning IP ranges, the user keeps reconnecting to different servers and regions. The server can't know exactly who's who, just that a bunch of users are using mullvad, while the user just need to find one server on one IP range that works.
Seems like a good deal to me. I don't care if they know I use mullvad, I care they don't know I'm me, and that's not something mullvad will easily disclose.
It seems surprising that people would expect a VPN to be comparable to Tor.
It does seem ridiculous once you spell it out like that, and then you have to realize that it’s plausible to de-anonymize even Tor users by controlling exit nodes.
The purpose of a VPN does not include anonymizing users with respect to the sites they visit,so it shouldn't be too surprising that Mullvad doesn't enforce unique exit IPs. Users who want anonymity should use networks like Tor.
> Surprisingly, the exit IP you are given is not randomized each time you connect to the server, but deterministically picked based on your WireGuard key, which rotates every 1 to 30 days (unless you use a third-party client, in which case it never rotates).
I'm a little confused on this... what is stopping third parties from doing key rotations like the main app clients if it is detailed in the repo how to do it?
Third party clients include e.g. the WireGuard driver in the Linux kernel. It's definitely not the network driver's job to mitigate an attack against one specific commercial service.
Given that Mullvad is basically a bulletproof VPN host[1], it would be great if site operators could rely on this property to enact bans. Given that the solution is simple (add a pseudorandom seed), Mullvad will likely push out a fix within a couple days.
surprising that the mapping may be stable enough to become a user-level signal. and rotating away from deterministic assignment seems like a cheap way to avoid creating an extra fingerprint
>Surprisingly, the exit IP you are given is not randomized each time you connect to the server, but deterministically picked based on your WireGuard key
What's the point of this? This seems more complicated to implement than mapping exit ips at the server level, so surely they must be doing this for a good reason?
I'd guess that this is to ensure one abusive user doesn't get every other user blocked from a large service (say, Google) for botting over the VPN and constantly rotating IPs.
It's a practical measure, but definitely has a privacy cost though.
It's possible that contributes, but to be honest most VPN users are split "privacy seeking" and "abusive". Though I grant you paid users are probably slightly more circumspect than users of Tor, etc.
It seems more likely this is just about load-balancing use against their available nodes.
It's a lot easier to implement because it's more stateless, and it's a better user experience.
If you get a new exit IP each time you connect, you need something like a NAT table to look up "key 0xabc exits ip 1.2.3.4", and that grows to be the size of the number of users you have active, so fairly large.
With a static mapping derived from the key, you don't need a table like that.
It's also better UX since it means reconnecting your VPN software (say you switch wifi hotspots) doesn't give you a different IP address, so things like SSH sessions can resume, which wouldn't be possible if it were a different public IP each time.
My guess is deterministic assignment makes load distribution and debugging easier. But for a privacy product, that convenience probably needs to be reconsidered
I imagine there are a bunch of things on the internet that break if you start trying to connect to them from varying IP addresses. Things like the various CAPTCHA schemes and rate limiting etc, IP reputation etc.
> I imagine there are a bunch of things on the internet that break if you start trying to connect to them from varying IP addresses. Things like the various CAPTCHA schemes and rate limiting etc, IP reputation etc.
Given how much of the world is stuck behind CGNAT now, I would expect any major sites to handle it.
Mullvad is a tiny world-famous ISP in Sweden that has zero KYC and explicit zero-log policy, specifically designed that way to enable mild abuses, that also accept PayPal, credit cards, and today I learned, cash in an anonymous envelope for payments. That doesn't scream US three-letter organization at all.
VPNs are not snake oil. They transfer the trust of your internet activity from a place of low-trust, your ISP, to a place of high-trust, ideally a trustworthy VPN like Mullvad, IVPN, or Proton. Among other benefits. If you don't like your ISP creating a profile of you and selling it to target ads to you, you should use a VPN.
>Should I use a VPN?
Yes, almost certainly. A VPN has many advantages, including:
1. Hiding your traffic from only your Internet Service Provider.
2. Hiding your downloads (such as torrents) from your ISP and anti-piracy organizations.
3. Hiding your IP from third-party websites and services, helping you blend in and preventing IP based tracking.
4. Allowing you to bypass geo-restrictions on certain content.
Making your traffic cross jurisdictional boundaries also adds a level of difficulty for tracking usage.
Local law enforcement can tap a local ISP for their records, but it would take a scale more effort to then tap a non-local service provider for their records. Each additional level of difficulty adds a cost, and at some point those costs aren't worth the potential results.
(assuming that the VPN provider doesn't just roll over due to an email inquiry, or isn't a front for very cooperative law enforcement).
How is private company (VPN) is more trustworthy than an other private company (ISP) and how do you expect them to protect your identity in face of determined state actors that are afer you?
What power is in $2.99/month that it offers so much security?
Why is that at least 40% of sponsorship to YouTube Creators seem to be from VPN industry?
This depends on your treat model. If what you worry about is massive collection of Linux ISOs that you download and distribute over P2P then probably shady VPN ISP is what you need.
> place of low-trust, your ISP, to a place of high-trust, ideally a trustworthy VPN like Mullvad
This is highly subjective statement.
Almost all commercial VPN services farm and sell your data. Just by that, my ISP is definitely high trust point while any commercial VPN is a low trust.
Most VPNs are untrustworthy, but unlike ISPs, you can choose from any VPN provider in the world, not just the two or three that are local to you. And there are VPN providers in the world that have been proven not to retain data by audits + actual court cases where the court determined that the VPN provider did not have the data authorities were seeking. Do your research and choose a court-proven VPN, it's that simple.
You probably won't find direct proof any more than you will find direct proof of any random VPN selling your data, it's just a given that commercial entities are liable to sell financially valuable data, and a list of all traffic, every website you visit and every service you use, tied to a specific identity is certainly financially valuable. Being in the EU doesn't change this; in fact the EU explicitly required that ISPs retain your identifying data with the Data Retention Directive, and though this was struck down after 8 years in court, many individual national governments immediately moved to impose similar requirements. I don't know if Germany was one of them but unless Germany has a specific privacy directive that goes beyond EU law I would see zero reason to place any trust in an ISP. In fact even if there was a law that's still not a reason to trust an ISP, because privacy laws are violated constantly; the most trustworthy source by far is a party acting opposite to the government, who has been investigated by the government and proven not to log the data that the government wants.
I was just talking to a friend who believes that the feds poison privacy communities by spewing nonsense like this. I don't think wg0 is a fed, and my friend didn't have any proof for his claim. My feeling is that it is probably people acting like regular humans. They hear things, they have opinions and they don't provide proof or adhere to community norms. Eternal september or something. Regardless of if it's federal agents disrupting the discussion or human nature, the response should be the same—push back with proof, and demand proof and avoiding logical fallacies.
>Also. This is how they ruined any meaningful talks about privacy
There is so much noise
"Use braive. Don't use braive. Use vpn. Don't use vpn"
Then the debate spreads to all other aspects
password managers, emails and etc
If people using some tool made my job harder id be vocally against it during off hours. But lets be real any powerful group interested in tracking people would just be working with or running vpn companies. Or perhaps providing free vpn. Either way I think its all moot as for tracking you have to question who you do and do not want to be tracked by and for other purposes vpn works just fine
The most generous way of reading that would be the fact that every YouTube pushing for a VPN as an essential tool just to use the internet outside of your house without getting hacked is a big exaggeration or fear mongering but there's good reasons for using a VPN for a lot of reasons and it's not snake oil.
> As an example, imagine that you are a moderator on a forum and you suspect that a new face is actually a sockpuppet of a user you banned the day prior. You check the IP logs, and despite using different Mullvad servers, both accounts resolve to the overlapping float ranges 0.4334 - 0.4428 and 0.4358 - 0.4423. This gives you a >99% chance that they are the same person.
This sounds like how I'd design a VPN if I were an intelligence agency.
It's a game of cat and mouse. The service keeps banning IP ranges, the user keeps reconnecting to different servers and regions. The server can't know exactly who's who, just that a bunch of users are using mullvad, while the user just need to find one server on one IP range that works.
Seems like a good deal to me. I don't care if they know I use mullvad, I care they don't know I'm me, and that's not something mullvad will easily disclose.
It seems surprising that people would expect a VPN to be comparable to Tor.
It does seem ridiculous once you spell it out like that, and then you have to realize that it’s plausible to de-anonymize even Tor users by controlling exit nodes.
The purpose of a VPN does not include anonymizing users with respect to the sites they visit,so it shouldn't be too surprising that Mullvad doesn't enforce unique exit IPs. Users who want anonymity should use networks like Tor.
> Surprisingly, the exit IP you are given is not randomized each time you connect to the server, but deterministically picked based on your WireGuard key, which rotates every 1 to 30 days (unless you use a third-party client, in which case it never rotates).
I'm a little confused on this... what is stopping third parties from doing key rotations like the main app clients if it is detailed in the repo how to do it?
Third party clients include e.g. the WireGuard driver in the Linux kernel. It's definitely not the network driver's job to mitigate an attack against one specific commercial service.
Given that Mullvad is basically a bulletproof VPN host[1], it would be great if site operators could rely on this property to enact bans. Given that the solution is simple (add a pseudorandom seed), Mullvad will likely push out a fix within a couple days.
1. It's the preferred VPN of TeamPCP.
surprising that the mapping may be stable enough to become a user-level signal. and rotating away from deterministic assignment seems like a cheap way to avoid creating an extra fingerprint
>Surprisingly, the exit IP you are given is not randomized each time you connect to the server, but deterministically picked based on your WireGuard key
What's the point of this? This seems more complicated to implement than mapping exit ips at the server level, so surely they must be doing this for a good reason?
I'd guess that this is to ensure one abusive user doesn't get every other user blocked from a large service (say, Google) for botting over the VPN and constantly rotating IPs.
It's a practical measure, but definitely has a privacy cost though.
It's possible that contributes, but to be honest most VPN users are split "privacy seeking" and "abusive". Though I grant you paid users are probably slightly more circumspect than users of Tor, etc.
It seems more likely this is just about load-balancing use against their available nodes.
It's a lot easier to implement because it's more stateless, and it's a better user experience.
If you get a new exit IP each time you connect, you need something like a NAT table to look up "key 0xabc exits ip 1.2.3.4", and that grows to be the size of the number of users you have active, so fairly large.
With a static mapping derived from the key, you don't need a table like that.
It's also better UX since it means reconnecting your VPN software (say you switch wifi hotspots) doesn't give you a different IP address, so things like SSH sessions can resume, which wouldn't be possible if it were a different public IP each time.
My guess is deterministic assignment makes load distribution and debugging easier. But for a privacy product, that convenience probably needs to be reconsidered
I imagine there are a bunch of things on the internet that break if you start trying to connect to them from varying IP addresses. Things like the various CAPTCHA schemes and rate limiting etc, IP reputation etc.
> I imagine there are a bunch of things on the internet that break if you start trying to connect to them from varying IP addresses. Things like the various CAPTCHA schemes and rate limiting etc, IP reputation etc.
Given how much of the world is stuck behind CGNAT now, I would expect any major sites to handle it.
VPNs are snake oil. Exit IPs are a public information.
Mullvad is a tiny world-famous ISP in Sweden that has zero KYC and explicit zero-log policy, specifically designed that way to enable mild abuses, that also accept PayPal, credit cards, and today I learned, cash in an anonymous envelope for payments. That doesn't scream US three-letter organization at all.
VPNs are not snake oil. They transfer the trust of your internet activity from a place of low-trust, your ISP, to a place of high-trust, ideally a trustworthy VPN like Mullvad, IVPN, or Proton. Among other benefits. If you don't like your ISP creating a profile of you and selling it to target ads to you, you should use a VPN.
>Should I use a VPN?
Yes, almost certainly. A VPN has many advantages, including:
1. Hiding your traffic from only your Internet Service Provider.
2. Hiding your downloads (such as torrents) from your ISP and anti-piracy organizations.
3. Hiding your IP from third-party websites and services, helping you blend in and preventing IP based tracking.
4. Allowing you to bypass geo-restrictions on certain content.
(https://www.privacyguides.org/en/basics/vpn-overview/)
Making your traffic cross jurisdictional boundaries also adds a level of difficulty for tracking usage.
Local law enforcement can tap a local ISP for their records, but it would take a scale more effort to then tap a non-local service provider for their records. Each additional level of difficulty adds a cost, and at some point those costs aren't worth the potential results.
(assuming that the VPN provider doesn't just roll over due to an email inquiry, or isn't a front for very cooperative law enforcement).
How is private company (VPN) is more trustworthy than an other private company (ISP) and how do you expect them to protect your identity in face of determined state actors that are afer you?
What power is in $2.99/month that it offers so much security?
Why is that at least 40% of sponsorship to YouTube Creators seem to be from VPN industry?
What is that they know and we don't know?
Unfortunately, the largest and most well-marketed VPNs are, in fact, less trustworthy than your average ISP.
This depends on your treat model. If what you worry about is massive collection of Linux ISOs that you download and distribute over P2P then probably shady VPN ISP is what you need.
Exactly. Most ISP are subject to local laws at least; where a lot of these ISP are overseas in shady jurisdictions.
> place of low-trust, your ISP, to a place of high-trust, ideally a trustworthy VPN like Mullvad
This is highly subjective statement.
Almost all commercial VPN services farm and sell your data. Just by that, my ISP is definitely high trust point while any commercial VPN is a low trust.
Your ISP farms and sells your data too.
Most VPNs are untrustworthy, but unlike ISPs, you can choose from any VPN provider in the world, not just the two or three that are local to you. And there are VPN providers in the world that have been proven not to retain data by audits + actual court cases where the court determined that the VPN provider did not have the data authorities were seeking. Do your research and choose a court-proven VPN, it's that simple.
Deutsche Telekom in Germany/EU farms and sells my data? Any sources?
You probably won't find direct proof any more than you will find direct proof of any random VPN selling your data, it's just a given that commercial entities are liable to sell financially valuable data, and a list of all traffic, every website you visit and every service you use, tied to a specific identity is certainly financially valuable. Being in the EU doesn't change this; in fact the EU explicitly required that ISPs retain your identifying data with the Data Retention Directive, and though this was struck down after 8 years in court, many individual national governments immediately moved to impose similar requirements. I don't know if Germany was one of them but unless Germany has a specific privacy directive that goes beyond EU law I would see zero reason to place any trust in an ISP. In fact even if there was a law that's still not a reason to trust an ISP, because privacy laws are violated constantly; the most trustworthy source by far is a party acting opposite to the government, who has been investigated by the government and proven not to log the data that the government wants.
Most ISPs have invested big bucks in Deep Packet Inspection
That just helps them classify the type of traffic. They're not breaking the encryption to see the actual content.
I can easily pay for a VPN service with crypto anonymously. I can also use a VPN run by a company outside my country of residence and jurisdiction.
Neither of those is possible with my ISP.
prepaid 5g sim cards and 5g modem.
Yes and 5G provider knows your exact location while VPNs can be easily chained.
Now try saying that wearing some Russian or Chinese shoes.
I was just talking to a friend who believes that the feds poison privacy communities by spewing nonsense like this. I don't think wg0 is a fed, and my friend didn't have any proof for his claim. My feeling is that it is probably people acting like regular humans. They hear things, they have opinions and they don't provide proof or adhere to community norms. Eternal september or something. Regardless of if it's federal agents disrupting the discussion or human nature, the response should be the same—push back with proof, and demand proof and avoiding logical fallacies.
>Also. This is how they ruined any meaningful talks about privacy
There is so much noise
"Use braive. Don't use braive. Use vpn. Don't use vpn"
Then the debate spreads to all other aspects password managers, emails and etc
If people using some tool made my job harder id be vocally against it during off hours. But lets be real any powerful group interested in tracking people would just be working with or running vpn companies. Or perhaps providing free vpn. Either way I think its all moot as for tracking you have to question who you do and do not want to be tracked by and for other purposes vpn works just fine
> VPNs are snake oil
The most generous way of reading that would be the fact that every YouTube pushing for a VPN as an essential tool just to use the internet outside of your house without getting hacked is a big exaggeration or fear mongering but there's good reasons for using a VPN for a lot of reasons and it's not snake oil.
> Exit IPs are a public information.
Yes, obviously.
> VPNs are snake oil
Huh?