How to know if a network interface is tap, tun, bridge or physical?
As far as I know, there are 4 main types of network interfaces in Linux: tun, tap, bridge and physical.
networking
How to SSH from host to guest using QEMU?
How do I setup ssh from the host to the guest using qemu? I am able to use port redirection when I boot the VM without any special parameters, as follows:
VirtualBox: two network interfaces (NAT and host-only ones) in a Debian guest on Ubuntu
I created a Debian VM on VirtualBox with two interfaces: a NAT one (for accessing internet) and a host-only one. However, I do not know how to make both interfaces work at the same time. If I the define the host-only as the adapter 1, I can access my VM from the host but not the internet; if I define the NAT one as adapter 1, I can access the internet but cannot reach my guest Debian.
Why are the first 1024 ports restricted to the root user only?
This is more idle curiosity than anything else. A friend of mine asked me ‘which port range is it that only root can use under Linux?’ I told him 0-1024 were restricted. Then he asked my why it was so and… I was at a loss. No idea whatsoever.
Does mount always require root privileges?
I was under the impression that any sort of call to mount requires root privileges. But recently I was told “You should instead create appropriate entries in /etc/fstab so that the filesystems can be mounted by unprivileged users”… which is counter to my experience using mount. Anytime I have used mount I have needed to … Read more
How to bring up a wi-fi interface from a command line?
I can’t figure out how to properly bring up the wi-fi card on my laptop. When I turn it on and issue
BOOTPROTO=none | static | dhcp and /etc/resolv.conf
What does it mean when it says BOOTPROTO=none in the /etc/sysconfig/network-scripts/ifcfg-eth0 file.
Connecting to IP 0.0.0.0 succeeds. How? Why?
We are serving a port on localhost and want to check in another process if the port is available. Due to a bug in our code, it is actually trying to connect to the IP 0.0.0.0:<port>, and for some reason it succeeds — as strace proves:
Find out network traffic per IP
We have one central server which functions as an internet gateway. This server is connected to the internet, and using iptables we forward traffic and share the internet connection among all computers in the network. This works just fine.
How can I make changes to the network routing metric permanently
I’m able change my network routing metrics with ifmetric, for example ifmetric enp0s3 1.