Dear god,
Met a very strange problem,
1, LWIP in LAN network router can communicate
2, LWIP equipment directly connected with PC can communicate
3, LWIP hanging above the public can't communicate,

In the public state: LWIP protocol stack equipment ready PC port mapping also do port mapping,
Compared to machine (running different software) can communication,

And LWIP can't ping, prompt the TIMEOUT,
And compare the machine can ping,

To help explain the situation analysis,

CodePudding user response:

Actually received reply invited, actually I also don't know much about, didn't get any LWIP, whether to do NAT private network through such processing to just go?

I have to study to just go,,,

CodePudding user response:

Thank you very much for reply,

LAN can pass, is a public network can pass?

If PC can send data to the LWIP equipment side, whether LWIP can take the initiative to send data to the PC

CodePudding user response:

See if your MAC address legal, illegal, there's no way into the public public will place your card as a virtual network card to deal with, do not forward your data

CodePudding user response:

Routing problem, you must be the port mapping to the LWIP equipment

CodePudding user response:

Our company just do the limitation of the hardware MAC address, only to register the MAC address of network card in the system to get to the Internet, not to register the MAC address of network card in the system can't get to the Internet,