[Mono-list] UDP and ICMP

[Giuseppe Greco]

... and of course, the application should be run
as root.

j3d.

> Hello All.
>
> I am using using mono to send udp packets between two hosts.  At some
> point, one host may go offline.  If I watch the network (using ethereal)
> I see the UDP packet go from A->B, and host B responds with a ICMP
> destination unreachable packet.  However, I don't see how I can get
> access to that packet in my application.
>
> I was hoping that SendTo or ReceiveFrom could throw exceptions, but I
> don't believe that is how they work.
>
> I also tried to make a separate socket to listen for the ICMP packets,
> but under Linux and Mono 0.30, I get an exception when I try to create
> the socket to listen for ICMP messages:
>
> Unhandled Exception: System.Net.Sockets.SocketException: Access denied
> in (unmanaged) /usr/local/lib/libmono.so.0(mono_raise_exception+0x1f)
> [0x4009176f]
> in (unmanaged) /usr/local/lib/libmono.so.0 [0x400b1d7d]
> in <0x00054> System.Net.Sockets.Socket:.ctor
> (System.Net.Sockets.AddressFamily,System.Net.Sockets.SocketType,System.Net.Sockets.ProtocolType)
> in <0x000d3> Gnucla.UdpEdgeListener:.ctor (int)
> in <0x001b0> Gnucla.EchoTest:Main (string[])
>
> Can anyone suggest a method that host A can see that host B is no longer
> listening without doing it at the application layer?  I just want the
> ICMP packet to have an effect.
>
> Thanks.
> POB
> --
> boykin@pobox.com    http://pobox.com/~boykin    jabber:
> johnynek@jabber.org
> fingerprint=D250 4AD9 4544 B7D2 A17C  911D D608 D387 6718 D75F
> fix copyright:
> http://cyberlaw.stanford.edu/lessig/blog/archives/EAFAQ.html
>


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Giuseppe Greco

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