[lwip-users] TCP SYN to UDP port

[Esa Hill]

Hello,

 

When nmap scan is executed against our device (LwIP 1.4.1), it responds with RST for SYN even when the socket/port is listening only UDP “connections”.

 

Is this correct behavior (does some RFC say something about this?) or should it just drop silently the SYN packet as it does for unused ports?

This came up in one certification process (they see it as a problem).

 

Br,

Esa Hill