[-] qjkxbmwvz@startrek.website 133 points 4 weeks ago

This gets posted regularly on Lemmy, and while the economic take is tone-deaf at best, there's a real issue with generating more power than you can use. You can't just dump grid power


it needs to go somewhere. The grid needs to consume as much as it generates at all times or else bad things happen.

There are of course solutions, but that doesn't mean it's not an engineering challenge to implement.

Figuring out what to do with kilowatts is easy, but figuring out what to do with megawatts, at the drop of a hat, is substantially harder.

4

Hi,

I am considering upgrading my router (RB750Gr3). I am eyeing the CRS309-1G-8S+IN in the hopes that the fast ISP in town eventually expand to my street (10G fiber).

My question is about L3HW offloading, and how it plays with PBR. Currently, I have a number of rules (/routing/rule), some based on source IP and some on VLAN. The purpose is to route certain traffic through VPNs (WireGuard, but I run on a separate computer, not on the router itself). Example: VLAN10 routes all traffic through main routing table, VLAN20 routes local traffic through router but sends external traffic through VPN-1, and VLAN30 sends everything through VPN-2. I use a number of different VPNs, so it's not just a binary "main route or VPN."

I am unclear how this plays with L3HW offloading. This page ( https://help.mikrotik.com/docs/spaces/ROS/pages/62390319/L3+Hardware+Offloading#L3HardwareOffloading-Inter-VLANRoutingwithUpstreamPortBehindFirewall/NAT ) mentions pbr-cap/usage/lpm-bank but I am unclear if that's referring to what I'd be using. That page also says that only the main routing table is HW offloaded in the context of VRF, so I wasn't sure if that also applied to PBR.

The question then, is, does L3HW offloading 1) Just Work for PBR /routing/rule, 2) only work via Fasttrack (perhaps requiring some redirect-to-cpu switch rules), or 3) ain't gonna work?

To preempt a few questions: I know Fasttrack is a last resort. I am a single household, I don't have concerns about TCAM exhaustion. I am considering a CRS instead of a "true" router due to cost and reduced energy footprint. I also know that I don't "need" 10G; if it is ever offered on my street it'll be via an ISP with a "best effort" policy, i.e., they don't have throttled tiers, so 10G is their only offering (cheaper than we're paying now for asymmetric cable).

Thanks!

4

What I want: I want to be able to route specific clients through different interfaces (WireGuard tunnels), and I want this behavior to persist upon disconnect/reconnect. Clients can change which tunnel, with several VLANs being able to use the tunnels (so a client A on VLAN 124 and client B on VLAN 789 can both use VPN tunnel X or Y at their discretion).

What I have: IPv4 works fine (routing rule src address -> routing table). IPv6 works, but is not persistent, as clients change their IPv6 address. (I have a dinky script where I enter IPv4 address and country, and it will grab a VPN peer from a json file, set it up, and add the IPv4+current IPv6 address to the routing rules. This works well currently; I use Mullvad.)

Any recommendations? Ideas: use IPv6 mangle based on MAC address, but I have been having trouble getting this to work (extremely slow). Another idea is to have a script run and grab the IPv6 address of client (either by hostname or by DHCP lease+MAC info), but I'm not sure if it's possible to trigger a script upon IPv6 neighbor discovery.

Any help appreciated!

[-] qjkxbmwvz@startrek.website 113 points 9 months ago

go2rtc, a camera streaming tool that's useful for security cameras, at least has some humor in their choice


port 1984, of course.

[-] qjkxbmwvz@startrek.website 155 points 11 months ago

Physics is like sex: sure, it may give some practical results, but that's not why we do it.


Richard P. Feynman

I think the same is true for a lot of folks and self hosting. Sure, having data in our own hands is great, and yes avoiding vendor lock-in is nice. But at the end of the day, it's nice to have computers seem "fun" again.

At least, that's my perspective.

[-] qjkxbmwvz@startrek.website 112 points 1 year ago

It's kinda a weird take? Like if I'm in a discussion about some scary things AfD are doing and a left-of-center German joins the conversation, I'd like to think I'd have the ability to...you know...hear what they have to say about things.

There are a bunch of Americans who asked for this; there are a bunch who stood by and did nothing to stop it; and there are a bunch who tried to stop it, did not, and are devastated.

I guess at the end of the day it's just a meme.

[-] qjkxbmwvz@startrek.website 104 points 1 year ago

Someone described respectful ways of interacting with children similarly


you can bring yourself down to their level, or you can bring them up to yours. Both are respectful, and there's no "talking down" to anyone.

[-] qjkxbmwvz@startrek.website 117 points 2 years ago

When I took some astronomy classes in the early 2000s, Jocelyn Bell was absolutely credited. In her own words:

It has been suggested that I should have had a part in the Nobel Prize awarded to Tony Hewish for the discovery of pulsars. There are several comments that I would like to make on this: First, demarcation disputes between supervisor and student are always difficult, probably impossible to resolve. Secondly, it is the supervisor who has the final responsibility for the success or failure of the project. We hear of cases where a supervisor blames his student for a failure, but we know that it is largely the fault of the supervisor. It seems only fair to me that he should benefit from the successes, too. Thirdly, I believe it would demean Nobel Prizes if they were awarded to research students, except in very exceptional cases, and I do not believe this is one of them. Finally, I am not myself upset about it - after all, I am in good company, am I not!

That said, yeah, I think she absolutely should have been awarded the Nobel prize. But while she did not, she has the admiration


rightly so


of many a budding astronomer.

[-] qjkxbmwvz@startrek.website 109 points 2 years ago

Reminds me of that West Wing episode where he "accidentally" makes an offensive gun analogy comment; Harris doesn't really alienate any supporters here, and she appeals to the undecided gun crowd voters. As a bonus, she's "telling it like it is" for folks who are self-described as being "fed up with PC culture."

[-] qjkxbmwvz@startrek.website 96 points 2 years ago

As much as I think a "would you like to have a beer with the candidates?" is a stupid way of measuring things...I wouldn't mind having a beer with these candidates.

[-] qjkxbmwvz@startrek.website 104 points 2 years ago

I like the sentiment, but there are non-peer reviewed papers that are real science. Politics and funding are real things, and there is a bit of gatekeeping here, which isn't really good IMHO.

Also, reproducibility is a sticky subject, especially with immoral experiments (which can still be the product of science, however unsavory), or experiments for which there are only one apparatus in the world (e.g., some particle physics).

[-] qjkxbmwvz@startrek.website 127 points 2 years ago

I just tried that and got the same result. It's from a site that just quotes a snippet of an Onion article 🤦

[-] qjkxbmwvz@startrek.website 117 points 2 years ago

One of the real downsides of ARM is, it seems, the relative lack of standardization. An x64 kernel? It'll run on most anything from the last ten years at least. And as for boot process, it's probably one of two options (and in many cases one computer can boot either legacy or EFI).

ARM, on the other hand...my raspberry pi collection does one thing, my Orange Pi does something else, and God help you if you want to try swapping the Orange kernel for the Raspberry (or vice versa)!

3

Noticed a few days ago that Sutro Tower's red blinking lights are now white. Just asked them on their website form, but wondered if anyone else knows the story with this.

Personally, I miss the red ones!

6
submitted 2 years ago* (last edited 2 years ago) by qjkxbmwvz@startrek.website to c/amateur_radio@lemmy.radio

Howdy!

I got my Technician in early 2000s, and last year finally upgraded to Extra. Looking to set up a very basic shack.

I'm looking for an HF setup, with most of my use probably using digital modes, but would like the ability to use voice.

Current transceiver is on loan from girlfriend's dad, a Ten-Tec Scout 555


50W HF unit with separate modules for each band. One limitation of this is that the modules set the mode, so it's LSB on 40m, making e.g. FT8 not possible (without some hacking of code or perhaps hacking the module).

Antenna is end-fed with an off-the-shelf 49:1. Currently only have 20m half-wave, but have just enough room for a 40m half-wave in the attic, which is the ultimate goal.

For digital modes, it looks like there are sort of 3 classes of radio:

  • "full digital" where the radio has e.g. a USB port and handles audio, transmit, and frequency set.
  • Some computer-control with RS232, but uses computer audio+adapter to transmit.
  • No digital, use adapter to transmit. This is what the current setup uses (and it works great!)

I'm leaning towards a conventional transceiver, e.g., something from ICOM, Kenwood, Yaesu, (or others) rather than an SDR unit. I'd like the ability to go up to 50-100W if possible.

I don't have a hard-and-fast budget; would like to keep it <$1000 if possible; mostly just looking at used transceivers. Something like a Kenwood TS-590 looks pretty amazing and very "plug-and-play" (but pushing up against price). Something like a Yaesu FT-920 looks pretty feature-rich too; and even something more affordable like an ICOM 706 or even a 725 is probably more radio than I need. Or just grab a new 7300 and call it a day!

Anyway...clearly, I don't know exactly what I want, but figured I'd ask folks with more experience if they have any wisdom. Thanks!

[-] qjkxbmwvz@startrek.website 261 points 2 years ago

Similar with Y2K


it was only a nothingburger because it was taken seriously, and funded well. But the narrative is sometimes, "yeah lol it was a dud."

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