How to connect two Ubuntu hosts to the Internet using one network cable

How to connect two Ubuntu hosts to the Internet using one network cable

Host A: ubuntu16.04

Host B: ubuntu16.04

Use the iwconfig command to view all network cards on the host. As shown above, the network cards on the author’s A host (laptop) are:
wlp2s0: This is a wireless network card.
enp1s0: Wired network card, the network card connected to host B.
The rest has nothing to do with us, no need to care.

Edit files

# vim /etc/network/interfaces

Configure a static IP address for interface enp1s0, as shown below

(The content below #===================== is newly added)
Restart interface enp1s0 (Note: Restarting may cause errors, so ignore it for now. This will only affect the result of step 5. If you need to handle it immediately, please go to step 6)

# ifdonw enp1s0 # ifup enp1s0 # ifconfig

Command to check whether the enp1s0 ip configuration is successful (the successful effect is as shown below)

Similarly modify/etc/network/interfaces
on host B this file. Modified to

(Note: There is an additional dns-nameservers item in the configuration of host B)
Restart B's interface, the same as A, no more details.
So far, executing the command ping 192.168.50.1 on host B can ping normally, indicating that the above work is correct.

This step is so that host B can access the external network through host A.
Execute in sequence on host A

# ip_forward :  echo 1 > /proc/sys/net/ipv4/ip_forward  # iptables -F # iptables -P INPUT ACCEPT # iptables -P FORWARD ACCEPT # iptables -t nat -A POSTROUTING -o wlp2s0 -j MASQUERADE （wlp2s0为A主机接外网的网卡）

At this point, host B can access the external network, and ping www.baidu.com on host B can ping normally.

Errors may occur during the process of restarting the interface

Error: /etc/resolv.conf isn't a symlink

Workaround for this error:
1), copy the/etc/resolv.conffile to the directory:/run/resolvconf/and download
2), delete/etc/resolv.conf
3), establish a soft connection:ln -s ../run/resolvconf/resolv.conf /etc/resolv.conf

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