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Problem with pf+bridge (2)

I've set up a bridge firewall with OpenBSD 3.3 stable.

Internet <---> ep0 OBSD xl0 <---> LAN

I've tested it with a PC simulating my LAN (with a backbone cable (1-3, 2-6)). All right. When I've tried to put it on my LAN HUB, the HUB start blinking in COLLISONS (with a normal cable) and nothing works. HUB works fine except when I connect my OBSD firewall (both interfaces)... My SWITCH at 'Internet' works fine with both interfaces. What should I do?

All NIC's are 3Com, HUB too. Here are my dmesg and ifconfig -a:
OpenBSD 3.3 (GENERIC) #44: Sat Mar 29 13:22:05 MST 2003
cpu0: Intel Pentium II (Klamath) ("GenuineIntel" 686-class, 512KB L2 cache) 267 MHz
real mem  = 133795840 (130660K)
avail mem = 118398976 (115624K)
using 1658 buffers containing 6791168 bytes (6632K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(57) BIOS, date 07/16/99, 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: 0xc0000/0x8000 0xc8000/0x800
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "Intel 82443BX PCI-AGP" rev 0x02
ppb0 at pci0 dev 1 function 0 "Intel 82443BX AGP" rev 0x02
pci1 at ppb0 bus 1
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: <ST310211A>
wd0: 16-sector PIO, LBA, 9538MB, 16383 cyl, 16 head, 63 sec, 19535041 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
pciide0: channel 1 disabled (no drives)
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
ep0 at pci0 dev 10 function 0 "3Com 3c595 100Base-TX" rev 0x00: address 00:a0:24:37:c1:fe, utp/100-TX default 100-TX irq 10
xl0 at pci0 dev 11 function 0 "3Com 3c905C 100Base-TX" rev 0x78: irq 11xl0: command never completed!
xl0: command never completed!
 address 00:04:75:d1:8b:d0
exphy0 at xl0 phy 24: 3Com internal media interface
xl0: command never completed!
xl0: command never completed!
vga1 at pci0 dev 12 function 0 "ATI Mach64 CT" rev 0x0a
wsdisplay0 at vga1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
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 5040 netmask 5c40 ttymask 5cc2
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

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33224
	inet netmask 0xff000000 
	inet6 ::1 prefixlen 128
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x6
lo1: flags=8008<LOOPBACK,MULTICAST> mtu 33224
	address: 00:a0:24:37:c1:fe
	media: Ethernet 100baseTX
	status: no carrier
	inet6 fe80::2a0:24ff:fe37:c1fe%ep0 prefixlen 64 scopeid 0x1
	address: 00:04:75:d1:8b:d0
	media: Ethernet 100baseTX full-duplex
	status: no carrier
	inet6 fe80::204:75ff:fed1:8bd0%xl0 prefixlen 64 scopeid 0x2
pflog0: flags=141<UP,RUNNING,PROMISC> mtu 33224
pfsync0: flags=0<> mtu 2020
sl0: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu 296
sl1: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu 296
ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
ppp1: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
tun0: flags=10<POINTOPOINT> mtu 3000
tun1: flags=10<POINTOPOINT> mtu 3000
enc0: flags=0<> mtu 1536
bridge0: flags=41<UP,RUNNING> mtu 1500
bridge1: flags=0<> mtu 1500
vlan0: flags=0<> mtu 1500
	address: 00:00:00:00:00:00
vlan1: flags=0<> mtu 1500
	address: 00:00:00:00:00:00
gre0: flags=9010<POINTOPOINT,LINK0,MULTICAST> mtu 1450
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
gif1: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
gif2: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
gif3: flags=8010<POINTOPOINT,MULTICAST> mtu 1280