On 19/9/19 18:06, Eric Vyncke (evyncke) wrote: > The authors of https://tools.ietf.org/id/draft-zhu-intarea-gma-03.txt > would like to use IP protocol 114 as it is described as “Any 0-hop > protocol” on the IANA page[1]. Alas, on the IANA page, there is no > reference to this “Any 0-hop protocol”. > > > > Obviously, we all understand that this must be a protocol using hop > limit = 0 (or TTL=0 for the legacy protocol). Just a (mostly side) comment: The hop limit thins is tricky: Some 0-hop (non-routable?) protocols actually use a high (e.g. 255) TTL, such that it can be enforced ("''''security''''-wise") that the parties are actually on the same network segment. Others (was it mld?) employ small hop limit values, such that you can control how far packets can leak out. So the protocol might actually use small or large hop limit, depending on whether you want to make sure that packets cannot be injected, or that packets cannot leak out. Thanks! Cheers, -- Fernando Gont SI6 Networks e-mail: fgont@xxxxxxxxxxxxxxx PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
