193
votes
Why is my ethernet interface called enp0s10 instead of eth0?
Answer on "What does enp0s10 means?" question:
enp0s10:
| | |
v | |
en| | --> ethernet
v |
p0| --> bus number (0)
v
s10 --> slot number (10)
Source: udev-builtin-...
- 2,101
136
votes
Accepted
How can I create a virtual ethernet interface on a machine without a physical adapter?
Setting up a dummy interface
If you want to create network interfaces, but lack a physical NIC to back it, you can use the dummy link type. You can read more about them here: iproute2 Wikipedia page.
...
slm♦
- 346k
107
votes
Accepted
Why is my ethernet interface called enp0s10 instead of eth0?
That's a change in how now udevd assigns names to ethernet devices. Now your devices use the "Predictable Interface Names", which are based on (and quoting the sources):
Names incorporating ...
- 34k
40
votes
Naming convention standard for Ethernet and Wi-Fi interfaces on Linux machines
Network interfaces can be named anything, so no matter what you do, you'll run into situations where (1) there is a "physical" network interface with a name that didn't match your pattern, or (2) ...
- 29k
37
votes
Why is my ethernet interface called enp0s10 instead of eth0?
As mentioned above, enp0s10 refers to ethernet (en), prefix 0 (p0), slot 10 (s10).
The bus number, device number, and function number are pulled from the Bus Device Function (BDF) notation for PCI ...
- 472
36
votes
How can I create a virtual ethernet interface on a machine without a physical adapter?
You can create virtual interfaces using the iproute2 toolkit.
ip link add veth0 type veth peer name veth1
This will create 2 interfaces, veth0 and veth1. Think of them as 2 ends of a pipe. Any ...
- 67.5k
29
votes
Can I connect a Ubuntu Linux laptop to a Windows 10 laptop via ethernet cable
Yes, as I have done this before, but with Ubuntu-based distros connected to Windows Vista. However this should still work with Windows 10. This is called a direct ethernet connection. There are a few ...
- 3,449
28
votes
Naming convention standard for Ethernet and Wi-Fi interfaces on Linux machines
For systemd predictable interface names, the prefixes can be seen in udev-builtin-net_id.c :
* Two character prefixes based on the type of interface:
* en — Ethernet
* ib — InfiniBand
* sl — ...
- 7,858
27
votes
Accepted
ip link and ip addr output meaning
Those are interface's flags. They are documented in the netdevice(7) man-page. Below is the relevant part (reordered alphabetically):
IFF_ALLMULTI Receive all multicast packets.
IFF_AUTOMEDIA ...
- 16.2k
17
votes
How to check programmatically if the Ethernet cable is plugged in?
The 2 methods I've seen used predominately are to use ethtool or to manually parse the contents of /sys.
ethtool
For example if your interface is eth0 you can query it using ethtool and then parse ...
slm♦
- 346k
15
votes
Accepted
Identical MAC address on two different VM, yet I have internet connectivity
This is one of those things that surprises people because it goes against what they've been taught.
2 machines with the same hardware mac address on the same broadcast domain can talk to each other ...
- 67.5k
15
votes
Determine ethernet speed in RHEL 6
Do NOT use mii-tool. It was last updated years ago and does not support anything over fast ethernet.
There are few ways you can determine ethernet speed. The most recommended one is
cat /sys/class/...
- 732
15
votes
Accepted
meaning of "brd" in output of IP commands
brd is short for broadcast.
147.202.85.255 is the broadcast address for whatever interface that line belongs to.
- 271k
15
votes
Accepted
Bridged interfaces and VLAN tags
Yes: you can set the bridge to be VLAN aware.
The bridge will then handle VLAN IDs attached to frames crossing it, including tagging and untagging them according to configuration, and will send a ...
- 25k
14
votes
Accepted
Linux disables ethernet auto-negotiation on plugging-in the cable?
After hours of searching I found the solution in the most obvious place:
NetworkManager seems to somehow have disabled autonegotiation right in the settings for my ethernet port:
The weird part is ...
- 371
14
votes
How to get maximum supported MTU size for interface?
Amazingly, I found that ip reports this information if asked.
ip -d link list
21: enxa44cc8aa52bd: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group ...
- 451
12
votes
Device vs network interface IP addresses
Each network interface will have it's own IP address if IP traffic is to flow through it.
Take for example, your router/modem device that most homes and/or small offices have.
There will a ...
- 31.7k
12
votes
Accepted
How do I configure a network interface bridge from WiFi to Ethernet with Debian?
For configuring a bridge from ethernet to wifi, it is as simple as doing in your /etc/network/interfaces:
auto eth0
allow-hotplug eth0
iface eth0 inet manual
auto wlan0
allow-hotplug wlan0
iface ...
- 53.4k
10
votes
2 IPs on 1 ethernet adapter
There is a Linux-feature which makes your machine reply for every IP address assigned, on every interface, when they share the same IP subnet, regardless of the particular IP-interface assignments. ...
- 1,222
10
votes
Accepted
How can I find active network interface from userland?
Something like this?
ip addr | awk '/state UP/ {print $2}'
enp0s3:
This command was issued as a "regular" (non-root) user on:
uname -a
Linux centos 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 ...
- 8,060
9
votes
difference tun/tap, is the interfaces that handle protocols or the OS?
The essential difference between TUN and TAP is the OSI layer at which they function (That does not include the programming required for each type of device):
TAP (OSI Layer 2) - Name TAP is from to ...
- 209
9
votes
DHCP release and renew over SSH?
The dhclient -r may work, if the DHCP server honours it and clears the lease server side.
The problem is that you did it manually and lost the connection and control of the session.
You had to do ...
- 53.4k
9
votes
Accepted
Internet not working without gpu installed?
Your networking devices are renamed to correspond with their location on the PCI bus. When you removed your GPU, your ethernet device changed from enp2s0 to enp1s0.
In order to reconnect, you have a ...
- 7,694
9
votes
Accepted
The difference between ip link down and physical link absence
There are difference between an interface which is administratively up but disconnected or administratively down.
Disconnected
The interface gets a carrier down status. Its proper handling might ...
- 25k
8
votes
Transfer files between Windows and Linux machines?
Please do not get discouraged by the overwhelming amount of information in setting up of samba. It's pretty simple as discussed here.
If you do not believe, these are the steps I did in my machine ...
- 36.7k
8
votes
How to have two network interfaces wifi and ethernet (as a backup) working together
I would use device bonding, meaning you are creating a new virtual device for which you assign the network settings (e.g. IP address, mask, etc.) and then you enslave both the ethernet and wifi ...
- 8,195
8
votes
Accepted
Remove SOME advertised link modes with ethtool
The thing with autonegotiation is that if you turn it off from one end, the other side can detect the speed but not the duplex mode, which defaults to half. Then you get a duplex mismatch, which is ...
- 116k
8
votes
Naming convention standard for Ethernet and Wi-Fi interfaces on Linux machines
The naming convention is that LAN interfaces are named eth0, eth1, ... and that WLAN interfaces are named wlan0, wlan1, ...
What you see are the so called "predictable names" that systemd introduced. ...
- 8,293
7
votes
Accepted
Bonds vs. Aggregators
Yes, given the following config:
.-----------. .-----------.
| Switch1 | | Switch2 |
'-=-------=-' '-=-------=-'
| | | |
| | | |
.-=----.--=---.---=--...
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