On 14-mei-2007, at 8:27, Ebalard, Arnaud wrote:
Why is everyone so in love with silently dropping?
This only makes troubleshooting harder.
So you use RH0 in your networks ?
What does that have to do with the question of whether dropping
should be silent or not?
But, apparently not:
#sh ipv6 traffic
IPv6 statistics:
Rcvd: 4113572 total, 49481 local destination
0 source-routed
Just by curiosity : How much ? How
do you filter it ? Where ? What brands of routers are you using ?
Hopefully, the vendors of my OSes will make sure hosts will stop
forwarding RH0 packets and I guess I'll tell my Cisco "no ipv6 source-
route".
- BSD will _forward_ IPv6 source routed packets even when IPv6
forwarding is disabled
That's no more the case : Look at http://www.natisbad.org/
That page only has links, it tells me nothing.
- apparently, there is no check whether the same addresses appear
multiple time in many implementations
Actually, AFAIK, there is no implementation that provides that
"feature". Anyway, with a O(n^2) complexity in the number of
addresses (for a basic implementation), this probably explain why it
is not widely implemented.
There is no complexity. It's a simple check: when taking the next
address from the list, see if either that address or the local
address appear anywhere else in the list.
But at this point, I don't see how it makes sense to fix this feature
rather than turning it off, as apparently nobody uses it, and the
chances of it still being in the next version of the IPv6 spec aren't
good.
Iljitsch
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