Tailcat – Like netcat, but over Tailscale’s data plane (github.com)
513 points by nderjung 11 hours ago
bradfitz 9 hours ago
One fun use case: a coworker just whipped up this Minecraft mod using tailcat as its transport: https://github.com/tailscale/tailcat-for-minecraft
(just a cute demo, not intended for release or ongoing maintenance)
awakeasleep 8 hours ago
It would be amazing to have something like this for bedrock so people with consoles without online subscriptions could join a self hosted bedrock mc server
unleaded 7 hours ago
nullsanity 7 hours ago
They can! They just need a real computer, the real Minecraft game (Java), and then they can! it's so easy when you don't play the shitty mobile clone.
tucnak 7 hours ago
megamorf 10 hours ago
So this is somewhat similar to Iroh?
genpfault 10 hours ago
Arqu 9 hours ago
https://github.com/n0-computer/pigeons offers the same but with SSH. I use it in my homelab extensivelly for access, tunneling smb, postgres and some other minor bits.
mikepurvis 10 hours ago
I enjoy that they supply a nix install/environment, similar to the main tailscale/tailscale repo. Is nix widespread or the standard dev environment at tailscale, or is it like a 10% option and most people just use Docker or whatever?
bradfitz 9 hours ago
It's not our standard dev environment but some of us use Nix. We don't really use Docker much, though. Mostly just "go test" etc.
innocent_name 7 hours ago
How do you guys deal with nix & go cache? i hate when nix cold starts builds, tests without go cache.
ronef 7 hours ago
Loving this. Honestly I keep encouraging folks to just TRY native Nix for dev environments. So easy to set up and get value on day 1 that you'd be shocked. Also models/LLMs have made lightyear strides in the last few months to help with everything around it. We've been building up Nix based skill systems into our Flox skill and it's been super meaningful both on adoption and when we need to scale it up. (disclaimer I do Flox.dev which is Nix based and we do cool Nix stuff)
aerzen 9 hours ago
I'd guess that there is an insignificant minority of people who strongly prefer nix over anything else.
And it might be because it is easy to provide and maintain compared to a .deb package.
swozey 9 hours ago
When I was writing rust stuff a few years ago it seemed like nix was the hip cool thing all the up and coming rustaceans (mostly unemployed students trying to land faang jobs) were using. If you're not familiar with the rust community it's very different from other programming communities I've been in (python/go/ruby/etc). Almost felt like you'd be kicked out of their lunch table if you weren't using it, but I've only see it that ubiquitous there.
A lot of them, instead of learning the usual linuxii you'll be using in containers at work dive headfirst into nix.
cure_42 5 hours ago
Always makes me chuckle when there's this uncountably large group of people, and someone meets a handful of them and then decides they can make broad, sweeping statements about the entire group, despite having not met 99.99...% of them XD
pbohun 9 hours ago
This is so cool! I mean, we really wouldn't need it if we had 100% ipv6 (no cgnat), but this is the next best thing. I think people underestimate the innovation that could happen if we had trivial p2p.
spockz 8 hours ago
How much Tailscale is this still if the transport is based on wireguard, the control plane is something new with the keys based on the wireguard keys? Genuinely confused.
zrail 7 hours ago
I dug into it a bit because I had the same question. The network layer here is wrapping around the Tailscale daemon's magicsock, which is the thing that does all the DERPing and NAT hole punching. Tailcat builds sort of a fake control plane that does a one way key exchange over DERP (the Meow message type) between client and server, then both sides do the normal CallMeMaybe dance to connect.
aseipp 9 hours ago
Just yesterday I was complaining that I wanted to SSH back to my homenet while at the office, on my office (not home) tailnet. I wrote something based on Iroh to do this, but it's one shot (ie not particularly generalized). Might be able to throw it away or redesign it with some inspiration from this! Thanks.
bradfitz 9 hours ago
There's an example in the README how to do exactly that :)
maisem 8 hours ago
I solved this problem by building/running a custom tailscale client that connects to two tailnets at the same time (https://github.com/maisem/tailmix)
linsomniac 7 hours ago
I was just wondering yesterday if it'd be possible to have a tailscale client, or multiple tailscale clients in their own network namespaces, that could connect to multiple networks.
The slightly tricky part would be managing a local NAT that blends the two networks, and also does MagicDNS to answer on those NATed IPs. If routes conflicted, I guess you'd have to pick one?
Seems very doable though.
maisem 7 hours ago
linsomniac 7 hours ago
codegladiator 9 hours ago
why not try out some existing project already on top of iroh ?
I see a bunch here on awesome-iroh page
dfish 9 hours ago
you could try rayfish.xyz, it is compatible with tailscale nowadays so you can run both tailscale and rayfish
archietect 10 hours ago
It looks like a direct competitor for the recently launched bitbang-cli
stillpointlab 5 hours ago
I've spent time finally learning what tailscale is and how it works and I'm impressed. It's a rare thing in the technology world but I'm glad I finally took the time.
I literally just figured out how tsnet fits into the picture (an in-process Go based entire network stack that gets the process to act as a node in the tailnet) and so that helps me understand this (everything in tsnet excepting the control plane). It's very impressive that they can do this in a reliable way.
tptacek 10 hours ago
This is smart. It's Magic Wormhole but for generalized connectivity, not just file transfer.
doomrobo 9 hours ago
Yes, though MW has the important distinction that it uses short human-readable session identifiers. This means MW supports file transfer where the out-of-band channel is just a phone call. This is also why it needs PAKE as opposed to the simpler cryptography used in tailcat
tptacek 8 hours ago
Not a huge lift to stick a PAKE in this protocol, though I'm dubious that it'd be much of a win. The PAKE + nameplate system in Wormhole makes a lot of sense, because you're doing one very specific thing with that system (moving a file from point A to point B). Here you're booting up servers; you're almost always going to have a non-voice channel to set up with.
MajesticHobo2 5 hours ago
ignoramous 8 hours ago
> This is also why it needs PAKE as opposed to the simpler cryptography used in tailcat
May be my idea of simpler cryptography is incorrect, but PAKEs like CPace do seem simpler than public key primitives in Noise.
tptacek 8 hours ago
1970-01-01 9 hours ago
As 'cattail' is not officially taken, I have to assume they are oblivious to having a little fun.
kemotep 7 hours ago
Keeps with the tradition of netcat alternatives like powercat, socat, cryptcat.
petcat 11 hours ago
I did the homemade version of this for years just with SSH forwarding and nginx reverse proxy
nateguchi 10 hours ago
but without nat traversal...
petcat 10 hours ago
Is NAT traversal actually that big of a feature? The category of people that would use a tool like this already knows many ways to do it without NAT getting in the way.
9dev 8 hours ago
frollogaston 8 hours ago
rugma 10 hours ago
Wush was already doing something similar (using tailscale under the hood)
wxw 5 hours ago
I just set up Tailscale as I've been hosting more personal apps off a small Hetzner VM and wanted a really simple personal networking solution. Works great, would recommend.
cpuguy83 11 hours ago
Interesting. I thought about doing this immediately after reading their old blog[1] post on punching through NAT some time ago.
Just a combo of never getting around to it and friends talking me out of it b/c of existing alternatives such as wormhole[2].
humanlity 2 hours ago
That's how I dreamed, Thanks tailscale
gz5 11 hours ago
i like that it removes tailscale proprietary.
if that is goal then why not go 100% open source to eliminate the ts derp control as well and get full sovereignty?
like netbird, openziti, zerotier, etc.
bradfitz 10 hours ago
(Author here)
The DERP server is already open source and tailcat can use any DERP server you run: https://github.com/tailscale/tailscale/tree/main/cmd/derper#...
We just provide some default ones (https://tailcat.dev/derpmap.json) to get started if you're not bandwidth-sensitive. But you don't have to use them.
Update: I added more explicit docs about this to https://github.com/tailscale/tailcat#bring-your-own-derp-rel...
gonzalohm 10 hours ago
Or just use wireguard directly. I get it that it's a pain in the ass to configure it, but there are plenty of open source config generators
bradfitz 10 hours ago
(Author here)
WireGuard doesn't do NAT traversal. That's the main thing this adds. And this also adds a CLI tool + library to do streams over WireGuard w/o installing kernel routings, requiring root, etc.
fodkodrasz 8 hours ago
IPSec may be a pain... but WireGuard is as simple as it gets in my opinion. Yeah, you may need to know basic IP concepts, like MTU...
NAT traversal is a different topic, WG won't help in that, and that can actually be a pain. I guess we should be using IPv6 already, and this tool would be largely redundant already. (not completely, encrypted access to isolated networks is a valid use case)
derkades 7 hours ago
zikduruqe 9 hours ago
> it's a pain in the ass to configure it
Public/private key pairs are hard? It's no more terrible than other projects that require configs.
gonzalohm 8 hours ago
mystifyingpoi 10 hours ago
> pain in the ass to configure it
Idk? I found it pretty easy to configure by blindly following the tutorials and copy-pasting keys. The only footgun is the keepalive setting, which will screw up the tunnel if one end is behind NAT, that tripped me hard, but besides this, no issues at all.
aitchnyu 10 hours ago
Umm, we have a full opensource Tailscale stack now?
raggi 9 hours ago
always have! our darwin and windows clients are closed source, but they wrap the oss implementation in github.com/tailscale/tailscale and you can see and even use all the same hooks yourself.
the control plane is closed source, but headscale is an open source alternative that we embrace and encourage people to use if it meets their needs/desires
codruterdei 10 hours ago
A bit off topic: it’s just insane how I used to watch this guy’s http2 in Go yt video 10 years ago, and he’s still very relevant to this day! Cheers Brad!
bradfitz 10 hours ago
Still working on Go's http2 10 years later :)
Recently: https://github.com/golang/go/commit/128a36cf0367c46daff2528d...
https://github.com/golang/go/commit/3c0665e551be23e62167f625...
cpuguy83 10 hours ago
Also created memcached, livejournal... Brad has a long list of impressive work.
ethagnawl 7 hours ago
Oh, wow. I had no idea. I've gotten a ton of use out of memcached over the years. Thanks for all your efforts, Brad!
quaintdev 10 hours ago
I wish his perkeep project was mature and stable.
bradfitz 10 hours ago
ipdashc 9 hours ago
Looks dope, though I'm surprised, is Tailscale fine with their DERP servers being used by non-customers like this? (Yes, it's a Tailscale project, but doesn't require login.) I vaguely assumed there was an auth step before you could use one as a relay. They mention a rate limit, but still
bradfitz 8 hours ago
Yes, it's been our CEO Avery's position for ~6.5 years now that we should run DERP servers on the internet for the public good. (rate-limited)
But these are a separate fleet (https://tailcat.dev/derpmap.json) separate from our usual ones, and not using "tailscale.com" in DNS or SNI anywhere.
ipdashc 5 hours ago
Fair enough. Thank you!
smw 9 hours ago
Repo suggests that they're running their own (rate-limited) DERP servers.
edit:
Which are probably tailscale's, as it's under tailscale/ github org?
ekarulf 7 hours ago
I use mosh over WebSockets to have a long lived connection to my home network.
I bet I could simplify out the WebSocket-to-UDP proxy by leaning into tailcat's dataplane and just speak straight UDP.
water-drummer 9 hours ago
Woah this is cool!
I've been making a mesh vpn like radmin vpn or hamachi that does not need a central authority server and most importantly, can run on all major OS thanks to wireguard-go.
MrDrMcCoy 10 hours ago
Looks like a Wireguard stunnel replacement, which is very useful!
mrsssnake 9 hours ago
Tool like this exposes big problem with the current shape of the Internet, I believe.
Everything should be possible with just plain netcat and IP stack. Someone asks about NAT holepunching, encryption, static IDs, permissions, etc., yes this is what Internet lacks and why every P2P app reinvents it over and over again.
MajesticHobo2 5 hours ago
notabug wontfix; that's the end-to-end principle in action. Bring your own all of that.
zackify 5 hours ago
super sick, already setup a derp server.
dns node key for fun on one
and two machines that connect, with systemd to keep tailcat serving ssh running
LoganDark 10 hours ago
What's the risk of malware using this for C&C or otherwise? Hackers love communication channels that are difficult to take down individually.
MajesticHobo2 5 hours ago
They say it's rate-limited, so at least it probably won't scale to large botnets or similar...
forrestthewoods 8 hours ago
I have a really dumb ignorant question.
What is a data plane? What is a control plane? I don’t genuinely understand what these words mean :(
ulimn 7 hours ago
Does this help? This is what I read on the topic a few weeks ago: https://tailscale.com/docs/concepts/control-data-planes
TZubiri 10 hours ago
>"like netcat, but over Tailscale's data plane"
Half of the Software offering nowadays seems to be selling vendor lock-in at no added value and then making a profit.
Sure there's always some negligible added value, and then they reinvent a whole stack for their ecosystem. In the case of tailscale the added value seems to be avoiding going into your router and activating port forwarding? It looks like negative added value to me. Someone that tells you "don't do NAT traversal, just open a port" would be highly valuable, but saying no doesn't seem to be trendy, and is certainly not an easy sell.
bradfitz 10 hours ago
(Author here)
There's no vendor lock-in here and no payment or account required. If Tailscale as a company fails, tailcat keeps working if you run your own DERP server. It's just open source code, not a hosted service.
TZubiri 9 hours ago
It's an official tailscale product no?
Fwiw, I don't think vendor lock-in is a bad thing, but being open source doesn't mean there's no vendor-lock in. If a client builds their system on top of an open source technology, then switching away from that dependency would have a cost, even if that cost is engineering man-hours.
If tailscale does not work out of the box with netcat, and requires a custom additional dependency to work, it raises the question that tailscale will not work out of the box with other tools like tcpdump or stunnel and apache, and I will need to install other custom dependencies like taildump, tailtunned, tailapache.
When compared to other solutions that integrate without additional effort, installing vendor-specific dependency forks/clones means that there is an additional vendor lock-in.
parasyte 7 hours ago
MattCruikshank 10 hours ago
...this is a github repo. Pointing to an open source project. That is not forced to use any vendor-specific systems to function.
TZubiri 9 hours ago
It's a pattern that occurs in commercial software yes, but Open Source has its own version of building mirror ecosystems. Collaborating to bleeding edge issues on robust infrastructure is very hard, so junior engineers that want to collaborate in open source (often for reputation building) can do so in these mirror ecosystems, it's an added bonus if they believe that they are contributing to the bleeding edge instead of rebuilding an enantiomer tech stack.
MattCruikshank 2 hours ago
mystifyingpoi 10 hours ago
> In the case of tailscale the added value seems to be avoiding going into your router and activating port forwarding?
Well, ignoring the tone... kinda yeah? I mean, if port forwarding works for you, and you have public IPv4, and you have no CGNAT, and you need a connection only between 2 hosts, then port forwarding is actually a half-decent idea. However, it's not what Tailscale excels at.
TZubiri 9 hours ago
> if port forwarding works for you
> port forwarding is actually a half-decent idea
You make it sound like both options are equally valid, and as if port-forwarding were some esoteric technology. It's not, one is good, the other is bad.
5 years ago I had a similarly bland position, live and let live, I'd go to a client that was using a Ddns (zapto.org) for production loads serving thousands of customers. 5 Years later, I see them constantly facing SSL issues, and network issues, and even if they weren't it's still the wrong way to do things.
We have to stand for something, get an IP address, get a domain. If you don't have either of those, raise funds, get a budget, speak to people, you can't tech your way out of some things, I know we are hackers, but sometimes the solution is not hacking. Yes we should develop the power to do things even without approval from institutions and without collaboration from the central NIC, or the domain holder, etc... But we should refrain from using that power and actually integrate with domain holders, actually get IPv4/IPv6 blocks.
There's many reasons why you would use a ddns or similar tech, lack of budget, lack of main domain holder approval, lack of NIC approval, lack of ISP approval. In all cases, you are way better off by actually going the other way instead of using a ddns.
1- no budget: Get a budget, a domain is like 15$/yr. a 1024 IPv4 block leased from a NIC is like 600-2500$/year, so the cost of a Host or ISP is 0.6$ to 2.5$, maybe they charge you a margin and you end up paying 5$ to 50$/yr? If this is an issue, maybe your project should die, how much is your time worth? Fund your projects accordingly, or let them die. If this is someone elses project, they cannot afford you.
2- ISP: Call your ISP, if they can't help you access your router, or port forward or whatever, hang up, call again. If your solution is to use a ddns instead of picking up the phone, you have overtrained your hard tech skills and need to work on your soft skills. Speak to a human, you won't get very far if you never speak to humans. This is not a niche thing, we call it port-forwarding but it's how TCP and IP work in general, this is the stuff of the internet, if you can't do something as basic as that, you are never gonna make it, sorry.
3- Domain holder: If you work for a client, and they have a domain, but you don't know who holds it, or where the passwords are. Don't jump to a ddns or buying another domain, integrate, investigate, do an inventory. At the very least buy another domain, a ddns is just cheap to the point of being unprofessional, see 1.
There's a 4th excuse that I'll handle as well:
4- I'm just testing, this is just a throwaway project: Even if it is, you are still underfunding your bets if you don't even have a domain and standalone non-firewalled IP, even if reusing an existing domain and host, we are talking about like 5$ per month. Imagine a professional of any class that cannot afford a tool worth 5$, even a plumber has a toolkit with a screwdriver in it.
Even if you share a link to your project to a friend, if it says hsabhsabdsa.tailscale.net or bjsdbsajdbsa.vercel.app , you are already neutering your project. You can skip this 'phase', it's not necessary for a project to go through all phases, especially if a vendor is trying to convinve you that you should go through this phase, skip it, tell them no, build it right even for your day 1 demo, it's better than having a pre-day 1 demo that has low quality and does things wrong.
LarsKrimi 6 hours ago
Neat idea in its core but its still tailscale underneath
The only thing that convinces me that tailscale isn't a CIA op is how badly it works for real uses
clavicle1009 7 hours ago
Netbird is the more mature version of this: fully open-source, self-sufficient, works like a charm, supports reverse proxying out-of-the-box, and much more. No reason to ever return to the Tail family.
runtime_terror 7 hours ago
idoescompooters 3 hours ago
Except the public relays are paywalled...