Loss on duplicated network in windows8?

Question

Network administration

Good day everyone!
There was a strange problem - the transmitting machine (running windows8) transmits multicast packets to two local networks (physically different) (in order to be able to collect data, there is a control counter for collecting information). The same software is installed on xp and on windows8, which receives these packets on both networks, while there are no losses on xp, but they are in windows8 (small, about 2-7 per 1000). At the same time, in windows xp ... there are no losses (or about one 1-2 per 10,000) even with one network. For sockets, it is set and checked that the receive buffer is the same. An attempt to update the driver on the host 8 did not help .. Maybe someone will tell you what the problem may be here (or tell you about the features of the ip stack in 8 in relation to xp).

Answer 1

In addition, one more test, if you make the xp transmitting machine (although the hardware and drivers are different), then by 8 (all packets are accepted).

Answer 2

If the UDP checksum is considered (check with a sniffer), then compare the Checksum offloading settings. Also, compare GSO/GRO (generic receive/send offload) settings if this technology is used.