Author: Nick Chalk Date: To: hampshire Subject: Re: [Hampshire] Are UDP responses allowed from a different source
port?
Chris Sykes <chris@???> wrote: > I believe that if you call connect() on a UDP
> socket, then you will only receive datagrams
> from the IP/port that you have "connected" to so
> it could be that is what your monitoring program
> is doing.
Thanks Chris.
connect(2) says:
If the socket sockfd is of type SOCK_DGRAM
then addr is the address to which datagrams are
sent by default, and the only address from
which datagrams are received.
I haven't yet worked out if the struct sockaddr
contains the port number as well. If it does, then
it sounds like this is the cause of the problem -
the Linux box is opening a socket that will only
accept responses from the address and port that it
sent the datagram to.
I'll see if I can find an option to turn this
behaviour off.
> An strace (or the source if you have it) should
> be able to confirm this.
It's just ldirectord, so the Perl source is
available. Sounds like I need to find out what
ldirectord and Perl are doing with the socket.
Nick.
--
Nick Chalk ................. once a Radio Designer
Confidence is failing to understand the problem.
