I have a IM driver binding two NIC(NIC A and NIC B) , similar with LBFO driver. All data of two NIC are forwarded to one MIC (NIC A, main port). the icmp and udp of two PC are workong fine . but there is a problem with the TCP connection establishment. . If NIC A(main port) in dst PC receiving SYN packet , the dst PC can sends the SYN/ACK packet to continue . But When NIC B in dst PC receiving SYN packet and forwarding it to main port (NIC A), the dst PC never sends the SYN/ACK packet to continue the TCP connection .
Any idea which could cause this problem?Thank you in advance!