This article gives you a comprehensive understanding of Java object serialization and deserialization>>> 
1. Is the current routing table complete
cat /etc/iproute2/rt_ tables
2. Whether the corresponding IP configuration is correct
ip ro add default via 192.168.0.1 dev eth0
Note: the current eth0 must have 192.168.0.0/24 IP
3. Whether the physical connection of the current network card is normal
ethtool eth0
Exception handling:
1。 Empty iptables
2。 Restart the machine
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