Hi, I hope someone can help me, I cannot seem to get a system's ethernet interface to correctly work in promiscuous mode... I have a Centos 6.4 system with 2 bnx2 interfaces on it. I have set up eth1 in promiscuous mode and am sending traffic to it using the port mirroring configuration on a Nortel 3510-24T switch. The switch reports that it is sending a fair amount of traffic to the mirror port. However, within Centos 6.4, I only see broadcast traffic from the switch: [root at host eth1]# ifconfig eth1 eth1 Link encap:Ethernet HWaddr 00:19:B9:E2:30:AE UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:75 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4800 (4.6 KiB) TX bytes:0 (0.0 b) I have tried various options configuring eth1 via /etc/sysconfig/networking/devices/ifcfg-eth1 Currently it looks like this: DEVICE=eth1 BOOTPROTO=static HWADDR=00:19:B9:E2:30:AE #NM_CONTROLLED=no ONBOOT=yes TYPE=Ethernet #UUID="e753ec9b-fc35-4460-bcd1-87f26f8d1553" IPV6INIT=no USERCTL=no PROMISC=yes I have also tried to manually put the interface in promiscuous mode (as I think PROMISC=yes is deprecated): ifconfig eth1 promisc It shows as being in promiscuous mode via ifconfig... The relevant parks of bootup / system messages: bnx2: Broadcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.2.3 (June 27, 2012) bnx2 0000:05:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 bnx2 0000:05:00.0: firmware: requesting bnx2/bnx2-mips-06-6.2.3.fw bnx2 0000:05:00.0: firmware: requesting bnx2/bnx2-rv2p-06-6.0.15.fw bnx2 0000:05:00.0: eth0: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz found at mem f8000000, IRQ 16, node addr 00:19:b9:e2:30:ac bnx2 0000:09:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 bnx2 0000:09:00.0: firmware: requesting bnx2/bnx2-mips-06-6.2.3.fw bnx2 0000:09:00.0: firmware: requesting bnx2/bnx2-rv2p-06-6.0.15.fw bnx2 0000:09:00.0: eth1: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz found at mem f4000000, IRQ 16, node addr 00:19:b9:e2:30:ae bnx2 0000:05:00.0: irq 95 for MSI/MSI-X bnx2 0000:05:00.0: eth0: using MSI bnx2 0000:05:00.0: eth0: NIC Copper Link is Up, 1000 Mbps full duplex bnx2 0000:09:00.0: irq 96 for MSI/MSI-X bnx2 0000:09:00.0: eth1: using MSI bnx2 0000:09:00.0: eth1: NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON bnx2 0000:05:00.0: irq 95 for MSI/MSI-X bnx2 0000:05:00.0: eth0: using MSI bnx2 0000:05:00.0: eth0: NIC Copper Link is Up, 1000 Mbps full duplex bnx2 0000:09:00.0: irq 96 for MSI/MSI-X bnx2 0000:09:00.0: eth1: using MSI bnx2 0000:09:00.0: eth1: NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON Does anyone have any ideas? Thanks Giles