What could cause a CentOS machine to respond with SYN-ACK packet having both source and destination MACs set to the address of the NIC from which the packet is being sent?
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Is it a virtual machine? – Barmar Jul 29 '14 at 15:11
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Yes, it is KVM. – jackhab Jul 29 '14 at 19:06
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Sounds like it's the KVM talking to the host. – Barmar Jul 29 '14 at 19:14
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There are two KVMs connected via bridge. No host connection on this interface. – jackhab Jul 30 '14 at 10:57
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Can you show us a packet capture of the handshake with the MACs and IPs? You can obscure the actual values if you want to hide your MACs and IPs, as long as we see the behaviour like you do. – suprjami Aug 17 '14 at 03:00