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In reply to: Andrew Holden: "Re: [Boost-users] [Boost.Asio] Udp::Socket-&gt;send_to"
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mccorywork_at_[hidden]

Ryan McConnehey wrote:

Nikolai N Fetissov wrote: 

Hi,

Ryan McConnehey wrote:

In using the Boost.Asio library, the Udp::Socket->send_to() function
throws an error if the endpoint is unreachable.  I thought in udp
datagrams its a send and forget mentality.  The send_to function would
send the message even if the endpoint was unreachable.  Is there a
setting I need to use for this to work?

This probably means you don't have a route to the target host,
so your kernel returns with error from local TCP stack without
actually putting packet on the wire.

I thought udp didn't need a route to the target host.  As long as there is a connection to a hub the socket > would send the data out.  Don't a route to the target host mean tcp?

No, UDP/IP still needs the route.  It doesn't verify the destination is actually available or attempt any form of two-way communication, but it does need to determine which router will get the packet closer to its destination.
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