Hi, Fred,
On 6/25/2013 3:32 PM, Templin, Fred L wrote:
Hi Joe,
The constraint you seem to be missing is that RFC2460 only requires
IPv6 nodes to reassemble as much as 1500 bytes.
Right; sorry for not noticing that further. Had IPv4 on the brain.
...
Granted, my algorithm is asking GRE egress tunnel endpoints to
configure a reassembly buffer size of 1500 *plus* the tunnel
encapsulation overhead, which is more than RFC2460 ensures.
Agreed.
...
Also think about it this way. Why should the tunnel work hard to
pass a packet that is larger than 1500 bytes and also larger than
the minimum link MTU within the tunneled path when the source could
instead adjust the size of the packets it is sending downward?
That's not a good argument. I agree that all that need be satisfied is
the largest reassembled IPv6 packet, but not that we should assume the
source can or will adjust downward - if that were the case, you could
ignore the overhead of GRE and just claim that the MTU is 1280.
Joe
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