I am currently designing a linux driver for a pure IPv6 driver. Is there any way to make the kernel module only support IPv6 and can only be assigned IPv6 address? What is the commands in linux to set the address?
Thanks
Adding IP:
Using ip command:
$sudo /sbin/ip -6 addr add 2001:0db8:0:f101::1/64 dev eth0
Using ifconfig command:
$sudo /sbin/ifconfig eth0 inet6 add 2001:0db8:0:f101::1/64
Deleting IP:
Using ip
$sudo /sbin/ip -6 addr del 2001:0db8:0:f101::1/64 dev eth0
Using ifconfig
$sudo /sbin/ifconfig eth0 inet6 del 2001:0db8:0:f101::1/64
Related
I want to do an ioctl equivalent for following iproute2 command:
Following commands have no brctl equivalent, hence unable to find ioctl equivalent:
ip link set eth0 master Bridge
bridge vlan del vid 1 dev eth0
bridge vlan add vid 101 dev Ethernet0
I need to issue ioctl as netlink is not supported.
ip link set eth0 master Bridge -> is equivalent to brctl addif <bridge_name>
i got equivalent ioctl from strace.
How can I check the GUI network setting is set DHCP or Static with command line? for the active and connected interface in Ubuntu 18.04
I want one line command like grep give me static/dhcp or true/false
Can use ip command to check interface you're interested in.
E.g. to check the interface eth0:
if ip -6 addr show eth0 | grep -q dynamic; then
echo "Uses DHCP addressing"
else
echo "Uses static addressing"
fi
-6 option is for checking IPv6 interface. You can use -4 for IPv4.
nmcli -f ipv4.method con show
If the output is auto, then it is DHCP.
If the output is manual, then it is static.
or
cat /etc/network/interfaces
DHCP enabled
auto eth0
iface eth0 inet dhcp
I have eth0 (Dhcp running). I want to create bridge over eth0 without losing N/w on eth0.
I have tried following
brctl addbr br0
brctl addif br0 eth1
Is it possible to create Bridge (br0 here) without losing n/w on interface (eth0)
You can create a route with iptables :
su -
iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE
iptables --append FORWARD --in-interface eth1 -j ACCEPT
echo 1 > /proc/sys/net/ipv4/ip_forward
How to Setup Linux Bridge
The standard configuration should consist of:
Create the bridge interface.
root#ubuntu-1:~ # brctl addbr br0
Add existing interfaces to the bridge.
root#ubuntu-1:~ # brctl addif br0 eth0
root#ubuntu-1:~ # brctl addif br0 eth1
Zero IP the interfaces.
root#ubuntu-1:~ # ifconfig eth0 0.0.0.0
root#ubuntu-1:~ # ifconfig eth1 0.0.0.0
Put up the bridge.
root#ubuntu-1:~ # ifconfig br0 up
Optionally you can configure the virtual interface br0 to take part in your network. To behaves like one interface (i.e a normal network card).
root#ubuntu-1:~ # ifconfig br0 192.168.0.1 netmask 255.255.255.0 up
To learn visit How to Setup bridge network for KVM
I've been looking into LXC containers and I was wondering as to whether or not it is possible to use an LXC container like an ordinary VPS?
What I mean is;
How do I assign an external IP address to an LXC container?
How do I ssh into an LXC container directly?
I'm quite new to LXC containers so please let me know if there are any other differences I should be aware of.
lxc-create -t download -n cn_name
lxc-start -n cn_name -d
lxc-attach -n cn_name
then in container cn_name install openssh server so you can use ssh then reboot it or restart ssh service.
To make any container "services" available to the world configure port forwarding from the host to the container.
For instance if you had a web server in a container, to forward port 80 from the host ip 192.168.1.1 to a container with ip 10.0.3.1 you can use the iptables rule below.
iptables -t nat -I PREROUTING -i eth0 -p TCP -d 191.168.1.1/32 --dport 80 -j DNAT --to-destination 10.0.3.1:80
now the web server on port 80 of the container will be available via port 80 of the host OS.
It sounds like what you want is to bridge the host NIC to the container. In that case, the first thing you need to do is create a bridge. Do this by first ensuring bridge-utils is installed on the system, then open /etc/networking/interfaces for editing and change this:
auto eth0
iface eth0 inet dhcp
to this:
auto br0
iface br0 inet dhcp
bridge-interfaces eth0
bridge-ports eth0
up ifconfig eth0 up
iface eth0 inet manual
If your NIC is not named eth0, you should replace eth0 with whatever your NIC is named (mine is named enp5s0). Once you've made the change, you can start the bridge by issuing the command
sudo ifup br0
Assuming all went well, you should maintain internet access and even your ssh session should stay online during the process. I recommend you have physical access to the host because messing up the above steps could block the host from internet access. You can verify your setup is correct by running ifconfig and checking that br0 has an assigned IP address while eth0 does not.
Once that's all set up, open up /etc/lxc/default.conf and change
lxc.network.link = lxcbr0
to
lxc.network.link = br0
And that's it. Any containers that you launch will automatically bridge to eth0 and will effectively exist on the same LAN as the host. At this point, you can install ssh if it's not already and ssh into the container using its newly assigned IP address.
"Converting eth0 to br0 and getting all your LXC or LXD onto your LAN"
How can I check in a shell script, whether the system is connected to WiFi-1 and if not connected, connect to WiFi-2? I tried using wpa_supplicant and interfaces configurations, but not working as expected. I followed this tutorial
If there is any other way of doing this, please let me know.
/etc/network/interfaces file
auto eth0
iface eth0 inet6 manual
pre-up ip link set dev eth0 up || true
wpa-iface eth0
wpa-driver wired
wpa-conf /etc/wpa_supplicant/wpa_supplicant_wired.conf
pre-down /etc/netplug/netplug eth0 out >/dev/null 2>&1 || true
post-down ip link set dev eth0 down || true
auto wlan0
iface wlan0 inet manual
pre-up ip link set dev wlan0 up || true
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
wpa-driver wext
pre-down /etc/netplug/netplug wlan0 out >/dev/null 2>&1 || true
post-down ip link set dev wlan0 down || true
# open is specific (IPv6 only) so I just stop dhcp via netplug
iface open inet manual
up /etc/netplug/netplug wlan0 out >/dev/null 2>&1 || true
iface default inet manual
up /etc/netplug/netplug wlan0 in >/dev/null 2>&1 || true
down /etc/netplug/netplug wlan0 out >/dev/null 2>&1 || true
I think you may have already found the solution by now. Anyway as a workaround to do this you can install Network manager (supports all debian distributions including ubuntu/raspbian/etc)
sudo apt-get install network-manager
And then add required network configuration to /etc/NetworkManager/system-connections folder.
Sample configuration for a wifi network connection as follows:
[connection]
id=milanWiFi
uuid=56439211-1067-4334-b199-b73ceed32d83
type=802-11-wireless
[802-11-wireless]
ssid=milanWiFi
mode=infrastructure
mac-address=84:3A:4B:9B:CF:66
security=802-11-wireless-security
[802-11-wireless-security]
key-mgmt=wpa-psk
auth-alg=open
psk=milan123
[ipv4]
method=auto
[ipv6]
method=auto
Here, id is an unique name for your connection and you can obtain uuid by calling,
uuidgen command in the console.
For you to get the available wifi connections, you can use
sudo iw dev wlan0 scan
and there you can see the relevant details about the connections. What you have to do is to grab the details out of it and create the configuration file.