From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: UDP Send gets NETWORK_IS_UNREACHABLE
Date: Tue, 3 Jul 2018 14:16:22 +0200
Organization: Aioe.org NNTP Server
Message-ID: <phfpel$j05$1@gioia.aioe.org>
References: <10ab697c-0f8d-4896-bf4e-44d01f685139@googlegroups.com>
NNTP-Posting-Host: MyFhHs417jM9AgzRpXn7yg.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101
 Thunderbird/52.8.0
Content-Language: en-US
X-Notice: Filtered by postfilter v. 0.8.3
Xref: reader02.eternal-september.org comp.lang.ada:53527
Date: 2018-07-03T14:16:22+02:00
List-Id: <comp.lang.ada>

On 2018-07-03 12:43, Petter Fryklund wrote:

> We have a need to send a broadcast message. In the test environment on Windows everything is fine. But in the productional environment on Linux we receive Socket Error NETWORK_IS_UNREACHABLE. I have searched the net a bit and it seems like we should use so_bindtodev, but that is not available on GNAT. Does anybody have some advice?

You do not need so_bindtodev, that is for sure.

You could do something like this:

    Create_Socket (Socket, Family_Inet, Socket_Datagram);
    Set_Socket_Option
    (  Socket,
       Socket_Level,
       (Reuse_Address, True)
    );
    Set_Socket_Option
    (  Socket,
       Socket_Level,
       (Broadcast, True)
    );
    Set_Socket_Option
    (  Socket,
       Socket_Level,
       (Receive_Timeout, <some reasonable value if responses expected>)
    );
    Address.Addr := Addresses (Get_Host_By_Name (<my host name>), 1);
    Address.Port := <port>;
    Bind_Socket (Socket, Address);
    Address.Addr := Broadcast_Inet_Addr;
    Address.Port := <port>;
    Send_Socket (Socket, <announce>, Last, Address'Access);
    loop -- Gathering responses
       begin
          Receive_Socket (Socket, <response>, Last, <who is there>);
       exception
         when Socket_Error =>
            null;
       end;
    end loop;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de