Below I’ll describe how to achieve this in Debian based and Red Hat based distros seperately.

Using Debian based distros (Ubuntu, Mint etc.), setting multiple IP addresses on a single network interface is simple.

What we will do is to edit the /etc/network/interfaces file.
If you are using DHCP, then your file should look similar to this,

auto eth0
iface eth0 inet dhcp

auto eth0:0
iface eth0:0 inet dhcp
iface eth0:0 inet6 dhcp

Here, the eth0:0 is how we get the secondary IP address on the eth0 device.

If you’re using a static IP address instead of DHCP, then your interfaces file should be like,

auto eth0
iface eth0 inet static
address 10.20.30.40
netmask 255.255.255.0
network 10.20.30.0
broadcast 10.20.30.255
gateway 10.20.30.1
dns-nameservers 8.8.8.8

iface eth0 inet6 static
address 2f00:7300:100::10
netmask 64

auto eth0:0
iface eth0:0 inet static
address 10.20.30.41
netmask 255.255.255.0

iface eth0:0 inet6 static
address 2f00:7300:100::11
netmask 64

You can add as many as you want, such as eth0:1, eth0:2 …

Sometimes when adding multiple IPv6 addresses on Debian systems, it is possible that you get an error. The current workaround for that is to enable and disable the device a couple of times. You can find the solution to that problem here.

In Red Hat based distros (CentOS, Fedora etc.), the interfaces are edited through the directory /etc/sysconfig/network-scritps. Here we have multiple files, each pointing for a device. For instance, to have 2 additional IP’s on a single ethernet device (totaling 3 addresses) we should have 3 files as follows,

/etc/sysconfig/network-scripts/ifcfg-eth0
/etc/sysconfig/network-scripts/ifcfg-eth0:1
/etc/sysconfig/network-scripts/ifcfg-eth0:2

The main device file would be just a standard one, we don’t have to change anything with it.
On the other hand, the ifcfg-eth0:1 file should be similar to this,

NAME=""
BOOTPROTO=static
MACADDR=""
IPV6INIT=no
DEVICE=eth0:1
NETMASK=255.255.255.0
MTU=""
BROADCAST=10.20.30.255
ONPARENT=yes
IPADDR=10.20.30.41
NETWORK=10.20.30.0
IPV6INIT=yes
IPV6ADDR=2f00:7300:100::11
IPV6_DEFAULTGW=2f00:7300:100::1
ONBOOT=yes

This would suffice. Don’t forget to restart your network services after adding the lines (or files) to with your appropriate settings.

For Debian : $ /etc/init.d/networking stop && /etc/init.d/networking start
For Red Hat : $ service network restart

For additional IPv6 addresses you should need to add IPV6ADDR_SECONDARIES=”” line to /etc/sysconfig/network-scripts/ifcfg-eth0 file

IPV6INIT=yes
IPV6ADDR=2f00:7300:1::2/64
IPV6ADDR_SECONDARIES="2f00:7300:1::3/64 2f00:7300:1::4/64 2f00:7300:1::fff4/64 2f00:7300:1::fff5/64"

The post Bind Multiple IP Addresses on a Single Network Card IPv4 & IPv6 appeared first on VeriTeknik.

The Preparation Steps

1. Request your IPv6 Addresses from your RIR or LIR
2. Add IPv6 Route to your AS number in LIR Portal
3. Get your IPv6 VLAN IP from your Upstream Provider
4. Configure your router

Configuring Cisco Routers for IPv6

Before you start applying IPv6 on your routers make sure that you backup your current configuration.

First of all, make a table of your arguments such as your IP addresses, AS numbers etc like below, we put some values for you to easily analyze the configuration:

Enable IPv6 & IPv6 CEF on your Cisco router:

ipv6 unicast-routing
ipv6 cef
!

Set your IPv6 address to the interface facing telco:

Don’t delete your IPv4 configuration or other necessary codes, just add

interface GigabitEthernet0/0
description $ETH-WAN$
ipv6 address 2A01:358:4500:2::2/64
ipv6 enable
ipv6 virtual-reassembly
..
..
!

Switch to BGP configuration by typing “router bgp 65535”

add:

router bgp 65535
.
.
neighbor 2A01:358:4500:2::1 remote-as 1000
!

type exit and type address-family ipv6 to enter IPv6 configuration

to announce your prefixes type:

address-family ipv6
neighbor 2A01:358:4500:2::1 activate
distance bgp 200 200 200
network 2B00:7300::/32
network 2B00:7300:100::/48
redistribute connected
redistribute static
no synchronization
exit-address-family
!

Type exit one more and you need to add routes for your IPv6 addresses,

ipv6 route 2B00:7300::/32 Null0 254

This is the basic IPv6 configuration for Cisco routers, now you should be able to communicate with IPv6 enabled hosts. To test your configuration you may assign IPv6 to one of your VLANs, an example given below:

interface GigabitEthernet0/1.201
description LOCAL
encapsulation dot1Q 201
.
.
ipv6 address 2B00:7300:100::1/48
!

The post Cisco Router IPv6 Configuration appeared first on VeriTeknik.

Run this command as root:

echo “alias net-pf-10 off” >> /etc/modprobe.conf echo “alias ipv6 off” >> /etc/modprobe.conf

You need to restart your server after this command.

The post Disabling IPv6 in Linux appeared first on VeriTeknik.