xl + bad tcp cksum ac0!

[julien Touche <julien_(_dot_)_touche_(_at_)_lycos_(_dot_)_com>]

i encounter some problems whith a xl NIC.
network is up (cf ifconfig & switch) but no way to use it.

when i ping, no response and tcpdump shows:

11:47:55.659363 192.168.x.1.2398 > 192.168.x.5.3493: . [tcp sum ok] ack 
2746091417 win 5840 (DF) (ttl 64, id 6490)
11:47:55.659448 192.168.x.5.3493 > 192.168.x.1.2398: . [bad tcp cksum 
ac0!] ack 1577441196 win 65535 (DF) (ttl 64, id 17286, bad cksum 14!)
11:47:55.659672 192.168.x.1.2398 > 192.168.x.5.3493: . [tcp sum ok] ack 
1 win 5840 (DF) (ttl 64, id 20426)
11:47:55.659760 192.168.x.5.3493 > 192.168.x.1.2398: . [bad tcp cksum 
ac0!] ack 1577441196 win 65535 (DF) (ttl 64, id 7795, bad cksum 14!)



Regards

		Julien


OpenBSD 3.2-stable (GENERIC) #2: Thu Mar 13 10:00:38 CET 2003
    root_(_at_)_etenemanki_(_dot_)_touche_(_dot_)_www:/sys/arch/i386/compile/GENERIC
cpu0: Intel Pentium II ("GenuineIntel" 686-class, 512KB L2 cache) 351 MHz
cpu0: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,SYS,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR
real mem  = 435785728 (425572K)
avail mem = 398180352 (388848K)
using 4278 buffers containing 21893120 bytes (21380K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(06) BIOS, date 03/03/00, BIOS32 rev. 0 @ 0xf0520
apm0 at bios0: Power Management spec V1.2 (BIOS mgmt disabled)
apm0: AC on, battery charge unknown
pcibios0 at bios0: rev. 2.1 @ 0xf0000/0xd92
pcibios0: PCI IRQ Routing Table rev. 1.0 @ 0xf0d10/128 (6 entries)
pcibios0: PCI Interrupt Router at 000:04:0 ("Intel 82371FB PCI-ISA" rev 
0x00)
pcibios0: PCI bus #1 is the last bus
bios0: ROM list: 0xc0000/0xb400 0xcc000/0x800
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "Intel 82443BX PCI-AGP" rev 0x03
ppb0 at pci0 dev 1 function 0 "Intel 82443BX AGP" rev 0x03
pci1 at ppb0 bus 1
vga1 at pci1 dev 0 function 0 "Nvidia GeForce2 MX" rev 0xa1
wsdisplay0 at vga1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
pcib0 at pci0 dev 4 function 0 "Intel 82371AB PIIX4 ISA" rev 0x02
pciide0 at pci0 dev 4 function 1 "Intel 82371AB IDE" rev 0x01: DMA, 
channel 0 wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <QUANTUM FIREBALL EX6.4A>
wd0: 16-sector PIO, LBA, 6149MB, 13328 cyl, 15 head, 63 sec, 12594960 
sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
atapiscsi0 at pciide0 channel 1 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <PIONEER, DVD-RW DVR-104, 1.33> SCSI0 
5/cdrom removable
cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2
uhci0 at pci0 dev 4 function 2 "Intel 82371AB USB" rev 0x01: irq 12
usb0 at uhci0: USB revision 1.0
uhub0 at usb0
uhub0: vendor 0x0000 UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
"Intel 82371AB Power Mgmt" rev 0x02 at pci0 dev 4 function 3 not configured
emu0 at pci0 dev 9 function 0 "Creative Labs SoundBlaster Live" rev 
0x07: irq 12
ac97: codec id 0x83847608 (SigmaTel STAC9708/11)
ac97: codec features 18 bit DAC, 18 bit ADC, SigmaTel 3D
audio0 at emu0
"Creative Labs SoundBlaster Live Digital Input" rev 0x07 at pci0 dev 9 
function 1 not configured
xl0 at pci0 dev 10 function 0 "3Com 3c905C 100Base-TX" rev 0x78: irq 
10xl0: command never completed!
xl0: command never completed!
 address 00:04:76:24:cd:fa
exphy0 at xl0 phy 24: 3Com internal media interface
xl0: command never completed!
xl0: command never completed!
bktr0 at pci0 dev 12 function 0 "Brooktree BT878" rev 0x11: irq 11
bktr0: Warning - card vendor 0x11bd (model 0x0012) unknown.
bktr0: Pinnacle/Miro TV, Temic PAL I tuner.
"Brooktree BT878 Audio" rev 0x11 at pci0 dev 12 function 1 not configured
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
sysbeep0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
npx0 at isa0 port 0xf0/16: using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
biomask d840 netmask dc40 ttymask dcc2
pctr: 686-class user-level performance counters enabled
mtrr: Pentium Pro MTRR support
dkcsum: wd0 matched BIOS disk 80
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302