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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

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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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[–] rtxn@lemmy.world 31 points 9 months ago* (last edited 9 months ago) (14 children)

Give each device a static address, and set the default gateway to whatever's on the other end of the cable. You might need a crossover cable, but most NICs can work using a straight-through.

E.g. set the laptop's address to 169.254.1.1/16 and default gateway to 169.254.1.2, and the RPi's address to 169.254.1.2/16 and default gateway to 169.254.1.1. They should be able to talk to each other then.

If those addresses seem familiar - Windows uses the 169.254.0.0/16 subnet to automatically assign random addresses if DHCP fails, so that if there are several computers in the subnet, they'll at least have addresses that can talk to each other. It's called APIPA in Windows, and Zeroconf in the Unixverse.

[–] thecrotch@sh.itjust.works 1 points 9 months ago

Setting the default gateway is unnecessary for a network of peers that are already on the subnet. It can only lead to problems as the hosts try to send every request outside their network to 169.254.1.1, which doesn't even exist in this scenario

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