Dear Naoki, > However, in my honest opinion, I am confused a little about target > technology in softwire.
Well, me too. This is why I am trying very hard lately to understand things first. > SA46T and SA46T-AS is just a tunneling technology. > > The other side, in my understanding, DS-Lite and 4rd is combination > technology of tunneling and NAT. For DS-Lite, I agree. However, for 4rd NAT is not necessary. As 4rd draft says: "Although 4rd is designed primarily to support IPv4 deployment to a customer site (such as a residential home network) by an SP, it can equally be applied to an individual host acting as a CE router." So if you have a host, acting as a CE router, supporting 4rd technology, you don't need NAPT44 in it. So in this regard, it is completely the same as SA46T-AS. At least this is how I understand it. > In my understanding, DS-Lite is CGN + Tunneling combination, so CGN + > SA46T combination may possible. I think this combination may say DS-Lite. I wouldn't use DS-Lite in any other context, since it is now an independent Proposed Standard. It is as it is. The tunneling there is clearly specified. > To similar, 4rd make NAT in CPE assumption. I don't understand 4rd is > just tunneling function, or combination with CPE NAT. In the standing > point of SA46T-AS, as you point out, SA46T-AS + CPE NAT combination may > possible. See above. > Both DS-Lite and 4rd is the combination technology for access network. > However, I also have interests to apply SA46T-AS to the server environment. Well, not necessarily, why? It's just a technology, I can't see why you couldn't use it in an enterprise as well? > I think your trade-off analysis is very important. If adding > SA46T/SA46T-AS technology to your analysis table, I think "DS-Lite + > SA46T" and "SA46T-AS + CPE NAT" is appropriate. Well, I don't agree with DS-Lite + SA46T, I would rather make it "SA46T + CGN". However, since your SA46T-AS already is an address sharing solution and it mentions NAT in one of the scenarios (in the draft), I don't think it needs to be combined with anything. So in the end, we have (regarding SA46T): - SA46T (tunneling only) - SA46T+CGN (NAPT44 placed in the core) - SA46T-AS (directly implemented in the host or NAPT44 placed in the CPE) Do you agree? Nejc _______________________________________________ Softwires mailing list Softwires@ietf.org https://www.ietf.org/mailman/listinfo/softwires
