[lwip-users] Re: Issue with udp_input() and source ports

[Jakob Stoklund Olesen]

Brian Lam <address@hidden> writes:

> My current workaround is to create one unconnected pcb just for
> receiving on all ports and another connected one for sending.

Hi Brian,

As Simon says, you should normally use sendto() instead of connect()
when sending UDP. Calling connect() on a UDP socket means that you can
only communicate with the connected host, even though UDP is
connectionless. This can make sense when talking to a known DNS server
for instance.

/jakob