Use IPIP to open tunnels and speed up network access

Used to speed up the network.

View the IPIP module:

 modinfo ipip

Start establishing the tunnel:

Note: Here, the public IP of host A is set to 1.1.1.1, and the public IP of host B is set to 2.2.2.2

A host operation:

 ip tunnel add ipip - tunnel mode ipip remote 2.2.2.2 local 1.1.1.1​​​​
ifconfig ipip - tunnel 10.0.1.1 netmask 255.255.255.0​​​

Host B operation:

 ip tunnel add ipip - tunnel mode ipip remote 1.1.1.1 local 2.2.2.2​​​​
ifconfig ipip - tunnel 10.0.1.2 netmask 255.255.255.0​​​

Then you can ping the intranet IP 10.0.1.1 set by host A on host B to see if it works. If it does, it means the connection is successful.

In addition, a method of directly using the network card configuration file (CentOS system) is introduced:

Host A (/etc/sysconfig/network-scripts/ifcfg-ipip-tunnel)

 DEVICE = ipip-tunnel
ONBOOT = yes
TYPE =IPIP
TTL =255
PEER_OUTER_IPADDR =2.2.2.2
PEER_INNER_IPADDR =10.0.1.2
MY_OUTER_IPADDR =1.1.1.1
MY_INNER_IPADDR =10.0.1.1

Host B (/etc/sysconfig/network-scripts/ifcfg-ipip-tunnel)

 DEVICE = ipip-tunnel
ONBOOT = yes
TYPE =IPIP
TTL =255
PEER_OUTER_IPADDR =1.1.1.1
PEER_INNER_IPADDR =10.0.1.1
MY_OUTER_IPADDR =2.2.2.2
MY_INNER_IPADDR =10.0.1.2

Then start the network card

Reprinted from: https://eqblog.com/ipip-tunnel.html