Localhost packet transmission without going through the network card, without being limited by the firewall
127 packets through the network card transfer, restricted by the firewall!!!!! For MAO
In host localhost resolves to 127.0.0.1, doesn't work here, since parsed into 127, but said that 127 bag without card again, this is not a contradiction,
To look a lot of information, it is CTRL CV, and there is no relevant solutions, design principle, compare the knowledge of the details,
Hope that we can discuss and find the problem key
