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@david_chisnall @ewenmcneill @mxshift Indeed, as mentioned by Ewen earlier, I forgot the part where the dest actually has to reply.

Re: sending a big packet to a victim, at worst won't that cause excess network traffic that'll be ignored (b/c the victim won't be listening, the kernel will discard it)?

Also I thought the whole purpose of IOMMU was "the kernel decides the memory addresses a device can write to/read from, for each xaction". Won't not knowing valid addrs guard against spoofing?