Re: [boost] Udp Socket

3 Feb 2014

      It's hard to be helpful without more information.  Assuming that you are
getting a boost::system::system_error thrown in direct response to the
send_to() call, I would:

1.  Examine your route table to see if there is a problem there.
2.  Try using traceroute to your desired address.
3.  Try using Wireshark to get more insight.

On Mon, Feb 3, 2014 at 12:51 PM, •°o.O sαмι O.o°• wrote:
...
Thanks to both Baker and Trey,
 I am not using any asyn.connect or connect method in my program just
using  "send_to" method
" socket.send_to(boost::asio::buffer(send_buf), receiver_endpoint);"
My requirement is to send data to multiple specified addresses and one of
them might be not available at that time so program should keep sending
data to other available addresses  but it terminates after throwing
exception "host unreachable". Broadcast cannot be used.
On Mon, Feb 3, 2014 at 10:12 PM, Joseph Van Riper <
fleeb.fantastique@gmail.com> wrote:
...
On Mon, Feb 3, 2014 at 11:41 AM, Shane Baker  wrote:
...
I cannot comment on your program termination error.
Regarding UDP being a connectionless protocol, errors may still be
returned
if the destination host is not reachable.  These errors are returned
via
ICMP.   You can see this with Wireshark or a similar tool.
As Baker points out, UDP still runs over IP, which is a routing protocol.
 If you send packets over UDP, it usually needs to reach a specific
destination.
If you have no destination in mind, you may broadcast your packets
instead,
for any receiving interface to receive.  To do this, you'd need to set
the
'broadcast' option.  If you do that, you probably also want to set the
do_not_route option as well, to limit how far such messages would
broadcast
(although, practically speaking, most routers will likely prevent your
broadcast packets anyway).
- Trey
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