[Tinyos-help] b6lowpan

[Stephen Dawson-Haggerty]

This isn't an acknowledgment.  This is a standard IP mechanism used to
inform the sender of a datagram that no one was listening on the port
a packet was destined to
(http://en.wikipedia.org/wiki/ICMP_Destination_Unreachable).  You can
stop this from happening by writing a small program to listen for
datagrams on the destination port.

On Tue, Mar 24, 2009 at 5:27 AM, swaytha sasi <swaytz at gmail.com> wrote:
> Hello..
>
> Thanks for the reply.I have indeed written a simple program to keep track of
> the message count. While sending UDP data to the basestation, i receive some
> sort of an acknowledgement from the basestation.I notice this in the
> wireshark. Will this affect the performance of the network as in increasing
> latency or packet loss? The following is the output from wireshark.
>
> No.     Time        Source                Destination           Protocol
> Info
>     143 380.875121  2001:470:1f04:56d::64 2001:470:1f04:56d::65 ICMPv6
> Unreachable (Port unreachable)
>
> [Protocols in frame: sll:ipv6:icmpv6:ipv6:udp:data]
>
> Internet Control Message Protocol v6
>     Type: 1 (Unreachable)
>     Code: 4 (Port unreachable)
>     Checksum: 0xfac9 [correct]
>     Internet Protocol Version 6
>         0110 .... = Version: 6
>         .... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
>         .... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
>         Payload length: 10
>         Next header: UDP (0x11)
>         Hop limit: 65
>         Source: 2001:470:1f04:56d::65 (2001:470:1f04:56d::65)
>         Destination: 2001:470:1f04:56d::64 (2001:470:1f04:56d::64)
>     User Datagram Protocol, Src Port: 3001 (3001), Dst Port: hbci (3000)
>         Source port: 3001 (3001)
>         Destination port: hbci (3000)
>         Length: 10
>         Checksum: 0x5585 [correct]
>     Data (2 bytes)
>
> With Thanks,
> Swaytha.
>