ietf
[Top] [All Lists]

Re: Is Fragmentation at IP layer even needed ?

2016-02-09 14:48:15
On Tue, Feb 9, 2016 at 3:27 PM, Joe Touch <touch(_at_)isi(_dot_)edu> wrote:


On 2/8/2016 4:47 PM, Phillip Hallam-Baker wrote:
...
Problem is that most of us have ethernet hubs rather than true IP
switches. If we had real IP everywhere we could deprecate MAC
addresses.

Except that we derive self-assigned IPv6 addresses from MAC addresses.

If we didn't need them to be MAC addresses we could go to EUI-64 and
have 16 shiny new bits to play with.


On Tue, Feb 9, 2016 at 3:24 PM, Joe Touch <touch(_at_)isi(_dot_)edu> wrote:


On 2/8/2016 2:44 PM, Joel M. Halpern wrote:
I would note that tunnel mechanisms either need a very good path "size"
reporting mechanism or a way to fragment.

If you don't have a way to fragment, you end up with a hard limit on the
amount of tunneling and tunnel overhead. Otherwise, at some point, you
end up with a "size" of zero.

By definition a tunnel has two ends. There is no reason why
fragmentation in a tunnel should make use of IP fragmentation as
opposed to an in-tunnel fragmentation scheme.