BusyBox v1.33.1 (2021-08-31 22:20:08 UTC) built-in shell (ash)
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OpenWrt 21.02.0, r16279-5cc0535800
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root@OpenWrt:~# opkg update
Downloading https://downloads.openwrt.org/releases/21.02.0/targets/ramips/mt76x8/packages/Packages.gz
Failed to send request: Operation not permitted
*** Failed to download the package list from https://downloads.openwrt.org/releases/21.02.0/targets/ramips/mt76x8/packages/Packages.gz
Downloading https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/base/Packages.gz
Failed to send request: Operation not permitted
*** Failed to download the package list from https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/base/Packages.gz
Downloading https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/luci/Packages.gz
Failed to send request: Operation not permitted
*** Failed to download the package list from https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/luci/Packages.gz
Downloading https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/packages/Packages.gz
Failed to send request: Operation not permitted
*** Failed to download the package list from https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/packages/Packages.gz
Downloading https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/routing/Packages.gz
Failed to send request: Operation not permitted
*** Failed to download the package list from https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/routing/Packages.gz
Downloading https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/telephony/Packages.gz
Failed to send request: Operation not permitted
*** Failed to download the package list from https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/telephony/Packages.gz
Collected errors:
* opkg_download: Failed to download https://downloads.openwrt.org/releases/21.02.0/targets/ramips/mt76x8/packages/Packages.gz, wget returned 4.
* opkg_download: Check your network settings and connectivity.
* opkg_download: Failed to download https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/base/Packages.gz, wget returned 4.
* opkg_download: Check your network settings and connectivity.
* opkg_download: Failed to download https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/luci/Packages.gz, wget returned 4.
* opkg_download: Check your network settings and connectivity.
* opkg_download: Failed to download https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/packages/Packages.gz, wget returned 4.
* opkg_download: Check your network settings and connectivity.
* opkg_download: Failed to download https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/routing/Packages.gz, wget returned 4.
* opkg_download: Check your network settings and connectivity.
* opkg_download: Failed to download https://downloads.openwrt.org/releases/21.02.0/packages/mipsel_24kc/telephony/Packages.gz, wget returned 4.
* opkg_download: Check your network settings and connectivity.
I've seen some topics about it, but did not want to revive old threads. I had this issue, but after some thinking it turned out that I just needed to set the device as DHCP client, as otherwise it overlapped with another device, so it was only able to use IPv6, but there was an IPv4 conflict. Now The main router assigned non-occupied IPv4 address and updates are working again.