Hi, i discovered that once the kernel is compiled 802.1Q VLAN Support the acenic driver swallows the 802.1q header in promiscous mode. I am tracing an gigabit ethernet with 802.1q in 802.1q so i would usually see 2 802.1q VLAN header. When compiling with VLAN aka 802.1q support the first or outer vlan header disappears from the traces even though the vlan support kernel module is not loaded nor vlans activated on the link.
Card i am using:
0000:06:02.0 Ethernet controller: 3Com Corporation 3c985 1000BaseSX
(SX/TX) (rev 01)
Subsystem: Unknown device 9850:0001
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr+ Stepping- SERR+ FastB2B-
Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (16000ns min), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 225
Region 0: Memory at fdff0000 (32-bit, non-prefetchable)
[size=16K]
dmesg output:
acenic.c: v0.92 08/05/2002 Jes Sorensen, [EMAIL PROTECTED]
http://home.cern.ch/~jes/gige/acenic.html
ACPI: PCI Interrupt 0000:06:02.0[A] -> GSI 78 (level, low) -> IRQ 225
0000:06:02.0: 3Com 3C985 Gigabit Ethernet at 0xfdff0000, irq 225
Tigon II (Rev. 6), Firmware: 12.4.11, MAC: 00:60:08:f6:f5:4e
PCI cache line size set incorrectly (64 bytes) by BIOS/FW, expecting
32
PCI bus width: 64 bits, speed: 66MHz, latency: 64 clks
Disabling PCI memory write and invalidate
0000:06:02.0: Firmware up and running
Kernel:
lnxp-1115:~# uname -a
Linux lnxp-1115 2.6.18-3-686 #1 SMP Mon Dec 4 16:41:14 UTC 2006 i686
GNU/Linux
lnxp-1115:~# egrep "CONFIG_ACENIC|CONFIG_VLAN" /boot/config-2.6.18-3-686
CONFIG_VLAN_8021Q=m
CONFIG_ACENIC=m
# CONFIG_ACENIC_OMIT_TIGON_I is not set
Thats the default Debian Etch kernel. I have seen this behaviour in a couple
kernel
releases since i started tracing stuff so its not a new bug.
Flo
--
Florian Lohoff [EMAIL PROTECTED] +49-171-2280134
Those who would give up a little freedom to get a little
security shall soon have neither - Benjamin Franklin
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