[arin-ppml] ARIN Draft Policy 2011-5: Shared Transition Space

David Farmer farmer at umn.edu
Tue Jul 5 17:22:22 EDT 2011

On 7/5/11 16:13 CDT, Owen DeLong wrote:
> On Jul 5, 2011, at 2:01 PM, William Herrin wrote:
>> 2. Router interface numbering is a potential use case. Filtering of
>> RFC1918 is too widespread to overcome, so using it outside the NAT
>> breaks path MTU detection. That's not inherently true of this new
>> space and nonfiltering could be encouraged in a way that renders it
>> usable in a few years.
> Not really... How would you know which ISP to route the packet
> back to?

Path MTU and ICMP TTL exceeds would be scoured from the router.  If the 
router is number with RFC 1918, many people filter inbound packets 
source from RFC 1918.  This possibly wouldn't be the case for the /10.

David Farmer               Email:farmer at umn.edu
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