https://github.com/ethereum/consensus-specs/pull/3360 effectively
extends the valid lifetime of an attestation/aggregate to 2 epochs -
this means that an aggregate that was published at the beginning of a
slot now is valid per the gossip rules up to 2 epochs later.
Then net effect of the above change is that peers are allowed to
republish old aggregates and attestations and libp2p will not stop the
spread with the settings we recommend - instead the messages will have
to be stopped with the "attestation cover rule" or similar, even though
they have been observed already.
Significant amounts of this kind of spam have been observed on the
aggregate channel in particular leading to a 5x increase in aggregate
traffic as some clients republish these old messages in spite of the
"attestation cover rule" which should have stopped them - this simple
change will provide an additional layer of protection against such bugs.
A couple gossip validation rules are only specced out for single
un-aggregated attestations, but are also checked by implementations
for aggregates. This adds a copy of the missing gossip validation rules
to the aggregated attestation docs.
Update gossip validation rules to use the highest `finalized_checkpoint`
across _all_ branches (`store.finalized_checkpoint`), instead of the one
on the currently selected branch (`state.finalized_checkpoint`) when
deciding whether to ignore a block / blob because they are already
finalized.
* Moved configuration into network preset instead of constants.
Now that `MAX_CHUNK_SIZE` and `GOSSIP_MAX_SIZE` are in configuration, we no longer need separate constants to represent them in the spec when they change in Bellatrix.
I've changed the usage, and put the values into the presets, but I'm not sure if I've updated the descriptions in the best way...
This is following on from the work in #3375 where a number of constants got moved into configuration, so we no longer need these constants to be separately represented, they can simply be updated in presets.
* Update presets/minimal/bellatrix.yaml
Co-authored-by: Hsiao-Wei Wang <hsiaowei.eth@gmail.com>
* Update presets/mainnet/bellatrix.yaml
Co-authored-by: Hsiao-Wei Wang <hsiaowei.eth@gmail.com>
* Moved preset items into the correct section and updated TOC.
It looked like the items listed in configuration about the max size and chunk size were no longer needed since we're updating preset values now and the preset changes seem to only be listed in the changes at the top.
* review feedback
* hopefully correct this time! Moved the 2 fields from configs into presets completely as suggested.
* WIP - changing back to being in config and updating the phase 0 value... I think this should be close but want to see what's outstanding.
* fix intellij's formatting of table.
* more fixes
---------
Co-authored-by: Hsiao-Wei Wang <hsiaowei.eth@gmail.com>
