On (06/26/18 21:02), Ka-Cheong Poon wrote: > > In this case, RFC 6724 prefers link local address as source.
the keyword is "prefers". > While using non-link local address (say ULA) is not forbidden, > doing this can easily cause inter-operability issues (does the > app really know that the non-link local source and the link > local destination addresses are really on the same link?). I > think it is prudent to disallow this in RDS unless there is a > very clear and important reason to do so. I remember the issues that triggered 6724. The "interop" issue is that when you send from Link-local to global, and need forwarding, it may not work. but I dont think an RDS application today expects to deal with the case that "oh I got back and error when I tried to send to address X on rds socket rs1, let me go and check what I am bound to, and maybe create another socket, and bind it to link-local" You're not doing this for IPv4 and RDS today (you dont have to do this for UDP, afaik) This is especially true if "X" is a hostname that got resovled using DNS > BTW, if it is really > needed, it can be added in future. shrug. You are introducing a new error return. --Sowmini
