Hi Eugene, The reason dust HTLCs count for the 483 HTLC limit is because of `update_fee`. If you don't count them and exceed the 483 HTLC limit, you can't lower the fee anymore because some HTLCs that were previously dust won't be dust anymore and you may end up with more than 483 HTLC outputs in your commitment, which opens the door to other kinds of attacks.
This is the first issue that comes to mind, but there may be other drawbacks if we dig into this enough with an attacker's mindset. Bastien Le ven. 23 avr. 2021 à 17:58, Eugene Siegel <elzei...@gmail.com> a écrit : > I propose a simple mitigation to increase the capital requirement of > channel-jamming attacks. This would prevent an unsophisticated attacker > with low capital from jamming a target channel. It seems to me that this > is a *free* mitigation without any downsides (besides code-writing), so I'd > like to hear other opinions. > > In a commitment transaction, we trim dust HTLC outputs. I believe that > the reason for the 483 HTLC limit each side has in the spec is to prevent > commitment tx's from growing unreasonably large, and to ensure they are > still valid tx's that can be included in a block. If we don't include dust > HTLCs in this calculation, since they are not on the commitment tx, we > still allow 483 (x2) non-dust HTLCs to be included on the commitment tx. > There could be a configurable limit on the number of outstanding dust > HTLCs, but the point is that it doesn't affect the non-dust throughput of > the channel. This raises the capital requirement of channel-jamming so > that each HTLC must be non-dust, rather than spamming 1 sat payments. > > Interested in others' thoughts. > > Eugene (Crypt-iQ) > _______________________________________________ > Lightning-dev mailing list > Lightning-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev >
_______________________________________________ Lightning-dev mailing list Lightning-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
