Jose Barreto tweeted earlier today about a new support article for SMB 3.0 Multichannel on Windows Server 2012 (WS2012). The scenario is that SMB Multichannel skips non-routable IP addresses of a network interface if routable IP addresses are also configured.
On a Windows Server 2012-based computer or a Windows 8-based computer that connects to a server message block (SMB) 3.0 file share, SMB Multichannel ignores non-routable IP addresses if the network interface has both routable and non-routable IP addresses configured. This behavior occurs even though SMB Multichannel typically tries to connect with additional interfaces if multiple network interfaces exist, and tries to establish multiple TCP/IP connections for a Receive-Side Scaling (RSS) capable network interface.
This is a complicated one and takes a couple of reads. There is no hotfix. It’s a configuration issue.
One thought on “KB2777646 – SMB Multichannel Skips Non-Routable IP Addresses Of NIC If Routable IP Addresses Also Configured”
The article isn’t terribly clear. Does this only affect nics set to APIPA/link local ranges or does it include private ranges or perhaps any subnet provided there is no default route? Do you happen to know? TIA