TIL rp_filter
https://www.howtouselinux.com/post/how-rp_filter-works-on-linux
不过我似乎只用得上那些机器的 ipv6 所以就先不管了
https://www.howtouselinux.com/post/how-rp_filter-works-on-linux
不过我似乎只用得上那些机器的 ipv6 所以就先不管了
howtouselinux
How rp_filter works on Linux? - howtouselinux
Rp_filter is short for reverse path filtering on Linux. We can use this to filter packets on Linux. Here are 5 common questions about rp_filter. What is reverse path filtering? Reverse path filtering is a mechanism adopted by the Linux kernel, as well as…
TIL knock-out
https://blog.cloudflare.com/how-verizon-and-a-bgp-optimizer-knocked-large-parts-of-the-internet-offline-today/
https://blog.cloudflare.com/how-verizon-and-a-bgp-optimizer-knocked-large-parts-of-the-internet-offline-today/
Cloudflare Blog
How Verizon and a BGP Optimizer Knocked Large Parts of the Internet Offline Today
Today at 10:30UTC, the Internet had a small heart attack. A small company in Northern Pennsylvania became a preferred path of many Internet routes through Verizon (AS701), a major Internet transit provider.
TIL
https://www.sdss.org/black-hole-mapper-release-20/
大概的亮点是他们真的按照观测的时间来修正这个图了，所以应该不会出现因为光传播速度恒定而在图上的两个坐标实际上差了几万年的情况
https://www.sdss.org/black-hole-mapper-release-20/
大概的亮点是他们真的按照观测的时间来修正这个图了，所以应该不会出现因为光传播速度恒定而在图上的两个坐标实际上差了几万年的情况
SDSS - Mapping the Universe
Mapping Monsters: SDSS-V Data Release 20 Unveils All-Sky Views of Supermassive Black Holes - SDSS
The Black Hole Mapper reaches a milestone with its first southern hemisphere optical observations, coordinated eROSITA X-ray identification, and multi-epoch tracking of accreting black holes across the universe.
TIL core, extra
```
core contains packages for:
booting Arch Linux
connecting to the Internet
building packages
management and repair of supported file systems
the system setup process (e.g. openssh)
as well as dependencies of the above (not necessarily makedepends) and the base meta package.
```
```
extra contains all packages that do not fit in core. This repository is jointly maintained by the Package Maintainers and Arch Developers. Examples: Xorg, window managers, web browsers, media players, tools for working with languages such as Python and Ruby, and a lot more.
```
```
core contains packages for:
booting Arch Linux
connecting to the Internet
building packages
management and repair of supported file systems
the system setup process (e.g. openssh)
as well as dependencies of the above (not necessarily makedepends) and the base meta package.
```
```
extra contains all packages that do not fit in core. This repository is jointly maintained by the Package Maintainers and Arch Developers. Examples: Xorg, window managers, web browsers, media players, tools for working with languages such as Python and Ruby, and a lot more.
```