Running KVM guests with virtio network interfaces, the guest will (probably in some - unidentified - circumstances) stop receiving packets.<br />
A tcpdump on the bugged interface will show only ARP requests being sent by the server and unanswered.<br />
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To solve (temporarily) the problem, doing a ifdown and ifup on the interface will let it run smoothly again for a while.<br />
Another solution is to switch to e1000 interfaces.
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