CentOS dual network card internal and external network configuration route network card alias detailed explanation

Dual network card configuration: Add a network card in the virtual machine settings in host-only mode, and after restarting, set it in /etc/udev/rules.d/70-persistent-net.rule Generate a new MAC address, copy the network card eth0 to eth1, be careful to remove the UUID and modify the correct MAC address, modify the configuration file:

BOOTPROTO={static|none|dhcp|bootp}: To use a static address, use static or none; dhcp means using a DHCP server to obtain the address;

IPADDR=: IP address NETMASK=: Subnet mask GATEWAY=: Set the default gateway; two network cards can only set one gateway. The gateway is the gateway in the virtual machine-network editor. If you need to access the Internet, you also need Add DNS1=gateway on the external network eth0. Restart the network card service and you can access the Internet normally.

Network Configuration:

Network configuration file:/etc/sysconfig/network

Network interface configuration file: ifcfg-ethx

/etc/sysconfig/network-scripts/ifcfg-ethx

DEVICE=: The associated device name must be consistent with the second half of the file name "ethx";

BOOTPROTO={static|none|dhcp|bootp}: Boot protocol; to use a static address, use static or none; dhcp means using a DHCP server to obtain the address;

IPADDR=: IP address

NETMASK=：Subnet mask

GATEWAY=：Set the default gateway;

ONBOOT=: Whether to automatically activate this network interface when booting;

HWADDR=: Hardware address, must be consistent with the address in the hardware; can be omitted;

The modification will not take effect immediately, but will take effect if you restart the network service or host;

Add route:

Routing:/etc/sysconfig/network-scripts/route-ethX

Add format one: route-eth1

DEST via NEXTHOP

192.168.10.0 via 10.0.0.254

Add format two:

ADDRESS0=Network address

NETMASK0=Mask

GATEWAY0=Gateway

Add routing command route:

Routing: route add: Add [-host: host route, -net: network route, default: default]

route add -net|-host DEST【iP】 gw NEXTHOP【Gateway】

route add default gw NEXTHOP

del：Delete [-host, -net]

route del -net 10.0.0.0/8

route del -net 0.0.0.0

route del default

[The changes made will become invalid after restarting the network service or host;]

View:route -n: Display related information such as each host or port in numerical form

DNS serverThere is only one way to specify: /etc/resolv.conf

nameserver DNS_IP_1

nameserver DNS_IP_2

Specify local resolution: /etc/hosts: host IP host name host alias [172.16.0.1www.magedu.com www]

Iproute2 command [ifconfig old]

link: Network interface attributes, addr: protocol address, route: routing

link show [ip -slink show eth0] is equivalent to ifconfig eth0

set【ip link set DEV {up|down}】Start the network card

addr add【ip addr add ADDRESSdev DEV】Add IP to the network card device DEV

del【ip addr del ADDRESSdev DEV】delete protocol address

show【ip addr show dev DEV to PREFIX【Specify prefix】】

flush【ip addr flush dev DEV【eth0】 to PREFIX】Clear protocol address

Network card configuration alias:

Network devices can be aliased: ethX:X, eth0:0, eth0:1, ...

Configuration method: ifconfig ethX:X IP/NETMASK [Subnet Mask]

/etc/sysconfig/network-scripts/ifcfg-ethX:X

DEVICE=ethX:X [Non-primary addresses cannot be obtained dynamically using DHCP];

ip eth1, add an address 192.168.100.1

ip addr add 192.168.100.1/24 dev eth1 labeleth1:0 [There is an alias ipconfig displayed, check ip addr show]

ifconfigeth0:0 192.168.50.1 netmask 255.255.255.255 broadcast 192.168.50.1 [Alias ​​complete configuration]

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