Strange public traceroutes return private RFC1918 addresses
Michael.Dillon at radianz.com
Michael.Dillon at radianz.com
Tue Feb 3 10:47:52 UTC 2004
>Which (as discussed previously) breaks things like Path MTU Discovery,
>traceroute,
If RFC1918 addresses are used only on interfaces with jumbo MTUs
on the order of 9000 bytes then it doesn't break PMTUD in a
1500 byte Ethernet world. And it doesn't break traceroute.
We just lose the DNS hint about the router location.
A more important question is what will happen as we move out
of the 1500 byte Ethernet world into the jumbo gigE world. It's
only a matter of time before end users will be running gigE
networks and want to use jumbo MTUs on their Internet links.
Could we all agree on a hierarchy of jumbo MTU sizes that
with the largest sizes in the core and the smallest sizes at
the edge? The increment in sizes should allow for a layer or
two of encapsulation and peering routers should use the
largest size MTU.
Thoughts?
--Michael Dillon
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