ICMP Unreachable

[Steve Deering]

At 11:34 AM -0800 1/19/99, Asbjørn Sannes wrote:
> It might not be a big problem for most people, but in the IPv4 used today
> any person can disconnect almost any connection with little or no knowledge
> using ICMP unreachable attacks.
> 
> I was woundering if this was fixed in IPv6, or if the "problem" will
> persist.

This problem is largely due to shortcomings in TCP implementations
which are independent of IPv4 vs. IPv6.  However, since IPv6 requires
implementors to make at least some minor changes to TCP code (to
deal with bigger addresses and changed pseudo-header), it would be
nice if implementors used the occasion to also fix their TCPs' behavior
in response to ICMP error message (in particular, changing them to
treat most ICMP errors as transient rather than fatal).

Steve