CentOS 6.4, Bnx2 In Promiscuous Mode Does Not See Packets

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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@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: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

One thought on - CentOS 6.4, Bnx2 In Promiscuous Mode Does Not See Packets

  • This turned out, not to be a problem with CentOS, but a limitation or the interpretation of the port mirror feature on the Nortel 3510-24T switch.

    Setting up a mirror port to capture traffic to/from port and to/from port doesn’t create a mirror port of traffic passing through either interface, but seems to mirror traffic that passes through both interfaces, which is no good in a VRRP situation!!

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