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 : <span class="a14c"> echo 1 > /proc/sys/net/ipv4/ip_forward </span> <span class="a14c"># <span class="postbody">iptables -F</span></span> <span class="a14c"><span class="postbody"># iptables -P INPUT ACCEPT</span></span> <span class="a14c"><span class="postbody"># iptables -P FORWARD ACCEPT</span></span> <span class="a14c"><span class="postbody"># iptables -t nat -A POSTROUTING -o wlp2s0 -j MASQUERADE (wlp2s0为A主机接外网的网卡)</span></span>
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.conf file 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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