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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