[arin-ppml] Ending point to point links as a justification for a /30?

[Richard A Steenbergen]

On Thu, Jul 29, 2010 at 04:04:42PM -1000, William Herrin wrote:
> 
> Hi Richard,
> 
> One of us misunderstands the situation. Let's back up and talk about
> how traceroute works, the character of the problem encountered when
> traceroutes are attempted via routers configured with RFC1918
> addresses and how the proposed technology attempts to address the
> problem.

William,

Rest assured I know exactly how traceroute works. :)

Sourcing the ICMP messages from a real loopback IP solves the problem of 
unreachables not making it back to the host due to filtering, but it 
still completely disrupts traceroute as a diagnostic tool. There is a 
lot more to troubleshooting a network than knowing the packet went from 
router A to router B, which is all you'd be left with if you sourced 
your icmps from a loopback.

For more information on how network operators use traceroute to 
troubleshoot real issues, take a look at:

http://www.nanog.org/meetings/nanog47/presentations/Sunday/RAS_Traceroute_N47_Sun.pdf

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)