On Sun, Dec 6, 2015 at 7:02 PM, David Ahern <d...@cumulusnetworks.com> wrote: > On 12/6/15 6:20 PM, Alexander Duyck wrote: >> >> That works for Linux to Linux, but what about the cases where you have >> a non-Linux endpoint on the other end such as something like a Cisco >> switch? > > > Why does is matter what kind of switch the NIC is connected to?
I think Cisco was just an example, not anything particular about their switches. But there are two general problems: * Some protocols, like VXLAN, recommend that the UDP checksum be zero so this is what pretty much everyone implements. As a result, independent of the merits of using the checksum, most non-Linux endpoints won't support it. * The reason why this recommendation exists in the first place is that most ASIC based switches can't compute/verify UDP checksums. They slice off the headers and only run that through the chip's core memory, so the rest of the packet isn't available to compute a checksum over. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
