> I'm looking at the spec for Via: processing. > RFC 3261 clearly shows that a Via: line can > contain DNS names, as well as textual > representations of network addresses. > > How many products actually implement support > for resolving DNS names provided in Via: lines?
Not very many support DNS resolution of a Via entry. However many support the concept of adding the Via's received parameter when it does not match the Via's sent-by address. > This seems... well, it seems unnecessary, > potentially insecure (allowing for easy DDoS > and potentially amplification attacks), and > just a general nuisance. Is this kind of > thing ever actually used for a good purpose? Some people have toyed with the idea of advancing response addresses based upon rfc3263 during failure situations. > Does any product do anything *but* just put > real network addresses in Via: lines in > requests? Yes. _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
