[Ns-developers] icmpv4 stack for merging

[Mathieu Lacage]

hi,

Since
http://mailman.isi.edu/pipermail/ns-developers/2008-September/004751.html

I spent a while debugging this icmp stack and running it through quite a
lot of testing. I made a couple of changes here and there, mostly to
avoid generating icmp messages for multicast packets to avoid icmp
storms. So far, the code has been reasonably stable so, this is a
request for merging to craig and raj.

Two patches attached:
  - icmp.patch contains all the changes for the src/node and
src/internet-stack directories. 
  - icmp-application.patch contains the ping application and the example
code.

It would be helpful to review the first patch again. The second patch is
both less risky and less intrusive.

regards,
Mathieu
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