Windows 7: sometimes IP packets sent bad NIC
I'm an investigation into a network on Windows 7 problem. The problem is the following.
We have a machine (PC1) that has two network cards.
1 NETWORK card is connected to our network (130.x.y.z / 23).
NIC2 is connected (via a switch) to a second network (192.68.x.y / 26).
NIC2 is used for communication between PC1 and PC2.
The problem is that once in while for PC2 IP packets are sent on NIC1 and the communication between PC1 and PC2 fails (we saw this via a network sniffer that we use)
Question: is this a known bug in the operating system or a driver?
The normal flow, PC1 wants to send an IP packet to the other PC (PC2):
1. If the ARP table contains no entry for MAC PC2 PC1 will broadcast an ARP request,.
2 PC1 PC2 ARP answered and refresh it ARP table,
3 PC1 sends the IP packet to the address MAC of PC2.
From time to time, however, IP packets are not sent to the MAC address of PC2, but the MAC address of the default gateway (on NIC1). As PC2 is not accessible from the default gateway these packets are lost. All of the following IP packets will be sent by the NIC1. However at any given time (randomly?) PC1 will pass the right network card.
Configuration: Two computers run on Windows 7 Enterprise Service Pack 1 64-bit
PC1 / NIC1: Intel 82579LM Gigabit IP: 130.x.y.z 23, DHCP: Yes, the default gateway: 130.x.y.1
PC1 / NIC2: Intel Gigabit AND Quad Port, IP: 192.68.x.y 26, DHCP: No.
PC1 / NIC2: Intel Gigabit AND Quad Port, IP: 192.68.x.1 26, DHCP: No.
This issue is beyond the scope of this site and must be placed on Technet or MSDN
Tags: Windows
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