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→Build a test environment; a small-scale local area network
net.ipv4.ip_forward = 0
* Check file on /proc:
$ cat /proc/sys/net/ipv4/ip_forward 0<br>
<span style="color:red;">If the value equals to 0, then means the ipv4 forwarding not open </span><br>
iii. Running IP forwarding<br>
If display like the above picture, then means have been successful test. Data from Machine A to Machine C could be forwarding from Machine B.<br>
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=== '''Configure OSPF Routing Protocol''' ===
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