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Some version of Windows appear to give the network adapter driver a packet broken up into fairly small pieces, eg Page 0: 14 bytes of Ethernet Header Page 1: 20 bytes of IP Header Page 2: 20 bytes of TCP Header Page 3: 1460 bytes of TCP Data When this happens, Linux appears to not pass the packets beyond the vifX.Y interface - a tcpdump on (say) vif455.0 shows packets but a tcpdump on eth0 does