Posts tagged networking
ip a command will conveniently show the addresses assigned to your network interfaces, but oftentimes this is not what the internet sees your machine as. So how to find your public IP address from...
I have a setup with two Raspberry PIs, a CM3 module with only a USB connection to the outside, and the Pi4 with a lot of connectors. I set up things such that CM3 functions as USB Gadget, and once...
I'd like to debug NetworkManager by stepping through it using GDB. I assume I'll have to compile NetworkManager from source to get debug symbols since file /usr/bin/NetworkManager indicates that th...
I am testing some DHCP stuff, and I want to manually end a lease so I don't have to wait hours for them to expire. How can I do this with OpenWrt?
How do I make my computer request a new IP from DHCP? I am using Arch with NetworkManager.
I have an Arch Linux machine connected to a LAN by ethernet. The router runs OpenWRT. DHCP assigns IPs to this machine like 192.168.1.* - quite typical. I want the IP to always be 192.168.1.10. I...
I run Windows games with Wine, and use bwrap to sandbox them. I've noticed that passing --unshare-net to disable the network breaks many, many games (they fail to start with no obvious error messag...
****Since upgrading to Ubuntu 22.04 recently, immediately after a reboot I have WiFi to an internet hotspot as I did prior to upgrading. After suspend then resume, the network is no longer working...
I was told that an IPv6 link-local address — typically starting with fe80:: — is derived from the interface's MAC address. Here are some instruction on how to do the conversion. But the conversion...
This blog post describes a privilege escalation, exploiting tar's --checkpoint-action option. The privilege escalation is used to solve a TryHackMe challenge. The root user calls tar via cron whi...
I'm playing with NAT, and have a script now that, at startup of my little Linux machine, creates some DNAT rules, which take one incoming special port, and forward that to another interface with a ...
My device is Thinkpad E40 with openSUSE Leap 15.4. I've use this device under this OS weeks ago and didn't happen this problem. After normally running, wlan0 device not show in nmcli and my wirele...
I have a RPi in the car that I need to act as a mobile AP. I need it to provide a consistent, unchanging ESSID (in AP mode) using the onboard wlan0 for all devices that stay in my car. Dashcams, t...
I got 2 small computers running Linux. One acts as ethernet gadget, connected via USB to the other, the host. I set up a bridge, like so: ip link add name br0 type bridge ip link set dev br0 up...
I have a RaspberyPi module, with USB connected to another module computer (as USB host) running Linux. The RasPi is configured as USB ethernet gadget. Once I boot the RasPi, and enter dmesg on th...
