Selfhosted

46304 readers

607 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.
No spam posting.
Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.
Don't duplicate the full text of your blog or github here. Just post the link for folks to click.
Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).
No trolling.

Resources:

selfh.st Newsletter and index of selfhosted software and apps
awesome-selfhosted software
awesome-sysadmin resources
Self-Hosted Podcast from Jupiter Broadcasting

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 2 years ago

MODERATORS

HybridSarcasm@lemmy.world

HybridSarcasm@lemmy.hybridsarcasm.xyz

Basic networking/subnetting question. (lemmy.dbzer0.com)

submitted 2 weeks ago by marauding_gibberish142@lemmy.dbzer0.com to c/selfhosted@lemmy.world

65 comments fedilink hide all child comments

Sorry for being such a noob. My networking is not very strong, thought I'd ask the fine folks here.

Let's say I have a Linux box working as a router and a dumb switch (I.e. L2 only). I have 2 PCs that I would like to keep separated and not let them talk to each other.

Can I plug these two PCs into the switch, configure their interfaces with IPs from different subnets, and configure the relevant sub-interfaces and ACLs (to prevent inter-subnet communication through the router) on the Linux router?

What I'm asking is; do I really need VLANs? I do need to segregate networks but I do not trust the operating systems running on these switches which can do L3 routing.

If you have a better solution than what I described which can scale with the number of computers, please let me know. Unfortunately, networking below L3 is still fuzzy in my head.

Thanks!

you are viewing a single comment's thread
view the rest of the comments

[–] marauding_gibberish142@lemmy.dbzer0.com 3 points 2 weeks ago* (last edited 2 weeks ago)

Thank you for the comment.

My threat model in brief is considering an attack on my internal networking infrastructure. Yes, I know that the argument of "if they're in your network you have other problems to worry about" is valid, and I'm working on it.

I'm educating myself about Lynis, AuditD and OpenVAS, and I tend to use OpenSCAP when I can to harden the OS I use. I've recently started using OpenBSD and will use auditing tools on it too. I still need to figure out how to audit and possibly harden the Qubes OS base but that will come later.

Yes, I do realise that the dumb switch has an OS. And you raise a good point. I'm starting to feel uneasy with my existing netgear dumb switches too. Thank you for raising this, I think a whitebox router build might be the only way.

I'd like to mention that I would use VLANs if I could use them on hardware and software I feel comfortable with. But I cannot. Whitebox build it is, I suppose.

Thanks again for the comment and I'd like to hear any suggestions you have.