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OpenWrt 21.02.0-rc1 - 首个发行候选版 - 2021 年 4 月 26 日

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 OpenWrt 21.02.0-rc1, r16046-59980f7aaf

OpenWrt是一个为嵌入式设备设计的一款Linux操作系统,它可以用于替换庞大数量的无线路由器 以及非网络设备的原厂固件。查看硬件支持表格获取更多 关于硬件支持的信息。如果你想知道更多关于OpenWrt项目的细节,可以查看 关于OpenWrt的页面

在大部分情况下,使用系统升级工具可以将 OpenWrt 19.07 顺利的升级到 OpenWrt 21.02 并保留 配置文件,但我们还是建议您在升级之前备份一下您的配置。(参见下方的“升级”章节)

你可以在此下载到 OpenWrt 固件:

OpenWrt社区在此非常自豪地发布 OpenWrt 21.02 系列的首个发行候选版。这个版本相对于之前的 OpenWrt 19.07 做出了超过 5800 次修改,并已经持续开发了一年半。

我们在 19.07 版本中引入了 WPA3 支持,但其并没有预装到出厂镜像中。

现在在 21.02 版本中,我们默认预装了这些 WPA3 所需的软件包。

TLS support is now provided by default in OpenWrt images including the trusted CA certificates from Mozilla. It means that wget and opkg now support fetching resources over HTTPS out-of-the-box. The opkg download server is accessed through HTTPS by default. OpenWrt switched from mbed TLS to wolfSSL as the default SSL library, mbed TLS and OpenSSL are still available and can be installed manually.

DSA stands for Distributed Switch Architecture and is the Linux standard to deal with configurable Ethernet switches.

OpenWrt 21.02 comes with initial support for DSA, which replaces the swconfig system that OpenWrt was using up until now. Not all targets have been ported: some devices still use swconfig while some devices already switched to DSA.

This is a significant change to how switch ports and VLANs are managed. As such, sysupgrade will not be able to convert existing swconfig configuration to DSA configuration (see “Upgrading” below).

以下设备在 OpenWrt 21.02 中会使用 DSA 管理的交换机:

Due to new features being introduced and the general size increase of the Linux kernel, devices now need at least 8 MB of flash and 64 MB of RAM to run a default build of OpenWrt. More flash space is recommended for extensibility, see 8/64 warning

It is still possible to build custom OpenWrt images (e.g. using the ImageBuilder) that may fit devices with 4 MB of flash or 32 MB of RAM. However, the level of functionality will be reduced and there is no guarantee to stability. See OpenWrt on 4/32 devices for more details and guidance.

A new realtek target has been added, which is often found in managed switches. As a result, it is now possible to run OpenWrt on devices with a significant number of Ethernet ports. See supported devices for realtek.

In addition, new bcm4908 and rockchip targets have been added.

Support for many new boards was added to the existing targets.

The ar71xx target was deprecated in OpenWrt 19.07 and has been gradually replaced by ath79, see ar71xx-ath79 migration.

With OpenWrt 21.02, the ar71xx has now been removed and users must use ath79 instead. If you are still running with the ar71xx target, it is recommended to reinstall OpenWrt 21.02 from scratch. Users already on the ath79 target can use sysupgrade to upgrade to OpenWrt 21.02.

Other targets were also removed: cns3xxx, rb532 and samsung.

Network exposed user space applications are linked as position-independent executable (PIE) to allow full Address Space Layout Randomization (ASLR) support. This makes it harder for attackers to exploit OpenWrt. See Hardening build options for more details.

Multiple Linux kernel compile options, needed for Linux Containers (LXC) and procd-ujail are activated by default for most targets. This allows to use LXC and ujail with the normal release builds.

It is possible to compile OpenWrt with SELinux support. This is currently not activated by default.

Core components have the following versions in 21.02.0-rc1:

  • Updated toolchain:
    • musl libc 1.1.24
    • glibc 2.33
    • gcc 8.4.0
    • binutils 2.35.1
  • Updated Linux kernel
    • 5.4.111 for all targets
  • Network:
    • hostapd 2020-06-08, dnsmasq 2.84, dropbear 2020.81
    • cfg80211/mac80211 from kernel 5.10.16
    • wireguard backport from upstream Linux kernel
  • System userland:
    • busybox 1.33.0

In addition to the listed applications, many others were also updated.

Sysupgrade can be used to upgrade a device from 19.07 to 21.02, and configuration will be preserved in most cases.

:!: 不支持从 18.06 升级到 21.02

:!: There is no migration path for targets that switched from swconfig to DSA. In that case, sysupgrade will refuse to proceed with an appropriate error message:
Image version mismatch. image 1.1 device 1.0 Please wipe config during upgrade (force required) or reinstall. Config cannot be migrated from swconfig to DSA Image check failed

:!: The default root file system partition size changed for targets/devices relying on booting from mass storage (HDD, USB flash, SD card, etc.), so MBR will change and any additional partition will be deleted when sysupgrading.

  • DSA support is new and might not be complete or fully working
  • LuCI 管理界面暂时不支持 DSA
  • LuCI writes unnecessary IPv6 RA options to /etc/config/dhcp if the user edits interface's DHCP settings. This could prevent client IPv6 connectivity.
    • Update luci-mod-network to git-21.110.65613 or later to fix this problem



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  • Last modified: 2021/06/01 08:12
  • by jiangming1399