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ssh into raspberry without a router (lemmy.ml)

submitted 9 months ago by WbrJr@lemmy.ml to c/selfhosted@lemmy.world

39 comments fedilink hide all child comments

Hi! I hope this is the right community to ask.

Next week I will be on the road for 5 Days for work. I have quite some spare time, so I thought I would dig up my raspberry project again and hopefully finish it.

I need it with me, because it controls some hardware, so a VPN to home does not work. So only option I could think of, is to connect the pi directly to my laptop via an ethernet cable. As far as I understood from some research is that I would need to install and run an DHCP server on my laptop, which they did not recommend. Alternatively they suggested to just take a router and plug both devices in there. I don't really have a spare router, so that's not an option either.

To be hones it confuses me a little, that there does not seem to be a standard for connecting to a device directly over a single cable and login with a user account.

Any recommendations how I can work on the pi like with ssh?

Thanks a lot!

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[–] poVoq@slrpnk.net 2 points 9 months ago* (last edited 9 months ago) (3 children)

I remember from back in the day that you need a ~~"twisted pair”~~ edit: ”cross-over” cable though, or do modern ethernet ports automatically adapt to that now?

[–] apprehensively_human@lemmy.ca 4 points 9 months ago (1 children)

You're thinking of crossover cables, though I'm not sure if those are still necessary.

[–] rtxn@lemmy.world 4 points 9 months ago (1 children)

Most modern NICs can auto-negotiate the Rx/Tx circuits on either kind of cable, but I'm not sure about RPi.

[–] fuckwit_mcbumcrumble@lemmy.world 3 points 9 months ago (1 children)

Only one device needs to be able to negotiate it.

Just about everything made in the last 20 years is capable of doing this.

[–] IsoKiero@sopuli.xyz 2 points 9 months ago (1 children)

If I remember correctly, 1000Base-T standard has a requirement that device has to negotiate pinout on the fly. No matter which pin is connected to which. Obvioiusly just randomly wiring a cable up has other problems, like signal-to-noise, but in theory it should work even if you make a cable that's as unstandard as you can make it.

[–] jkrtn@lemmy.ml 1 points 9 months ago

That's amazing. I would love to see the algorithm for that. Hopefully I'll find a nice explainer if I search around.

[–] BearOfaTime@lemm.ee 4 points 9 months ago (1 children)

Twisted pair refers to the twisting of the wires in the cable to reduce crosstalk.

Crossover cables enable permit connecting two non-sensing ports together.

[–] poVoq@slrpnk.net 3 points 9 months ago* (last edited 9 months ago) (1 children)

Right 🤦‍♂️ It has been a while. I corrected it in the original post now.

[–] BearOfaTime@lemm.ee 0 points 9 months ago

I hear ya. I know all this stuff, but dammit if it isn't hard to access sometimes! Haha

[–] kuneho@lemmy.world 2 points 9 months ago

I think it doesn't matter nowadays. Network interfaces are smart enough to twist them internally, or at least, this is what I experienced. I have no idea when did I had to use specifically a crosswire cable, all of my ethernet cables are patch cables for a while now.

So, it shouldn't be a problem.