On Fri, Sep 08, 2017 at 09:03:31AM +0000, David Laight wrote: > Can anyone think how to create multiple outgoing connections > from the same subset of local IP addresses and the same port? > > We bind() to the first IP address and port, then use > SCTP_SOCKOPT_BINDX_ADD to add the second IP address. > But even with IP_REUASADDR set you can't repeat that on > a second socket. When did you set IP_REUSEADDR? Checking the code, seems you have to set it before any binding, because then the port entry will be created and such flag will be initialized with that state. > > It is possible to bind a second socket by reversing the > order of the IP addresses (this might be deemed to be a bug!) Interesting. It does seem like a bug. Probably related to the above behavior. > > If you bind to IN_ADDR_ANY then a second socket can be bound > to the same port once the outgoing connection has been made > (and the actual local address assigned). > This works for TCP, but for SCTP you almost always need to > constrain the local addresses advertised on the connection. > > Ideas? > > I've not tried binding to IN_ADDR_ANY and using bindx to > add all the addresses. > > David > > -- > To unsubscribe from this list: send the line "unsubscribe linux-sctp" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
