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Multiport NIC & dropped packets

I have a dual-homed firewall setup with a NC3131 dual-port nic in it. eth0 goes to the outside world, eth1 to the internal network. The setup works, the problem I've come across is that when I ping either nic I get intermittent dropped packets - especially when traffic is going through the firewall. I'm running 2.6.5, and I've tried both the e100 and eepro100 drivers - both have the same effect. Could it be the firewall (P166) can't keep up with traffic or could it be some other issue?
0000:00:00.0 Host bridge: Intel Corp. 430VX - 82437VX TVX [Triton VX] (rev 02)
0000:00:07.0 ISA bridge: Intel Corp. 82371SB PIIX3 ISA [Natoma/Triton II] (rev 01)
0000:00:07.1 IDE interface: Intel Corp. 82371SB PIIX3 IDE [Natoma/Triton II]
0000:00:0b.0 VGA compatible controller: S3 Inc. 86c764/765 [Trio32/64/64V+] (rev 54)
0000:00:11.0 PCI bridge: Digital Equipment Corporation DECchip 21154 (rev 05)
0000:01:04.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)
0000:01:05.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)
Linux version 2.6.5 (root@debian) (gcc version 3.3.3 (Debian 20040401)) #1 Wed May 12 14:27:27 MDT 2004
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 0000000002000000 (usable)
 BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
32MB LOWMEM available.
On node 0 totalpages: 8192
  DMA zone: 4096 pages, LIFO batch:1
  Normal zone: 4096 pages, LIFO batch:1
  HighMem zone: 0 pages, LIFO batch:1
DMI not present.
ACPI: Unable to locate RSDP
Built 1 zonelists
Kernel command line: root=/dev/hda2 ro
Initializing CPU#0
PID hash table entries: 256 (order 8: 2048 bytes)
Detected 166.219 MHz processor.
Using tsc for high-res timesource
Console: colour VGA+ 80x25
Memory: 29196k/32768k available (1630k kernel code, 3140k reserved, 522k data, 300k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay loop... 326.65 BogoMIPS
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU:     After generic identify, caps: 000001bf 00000000 00000000 00000000
CPU:     After vendor identify, caps: 000001bf 00000000 00000000 00000000
Intel Pentium with F0 0F bug - workaround enabled.
CPU:     After all inits, caps: 000001bf 00000000 00000000 00000000
CPU: Intel Pentium 75 - 200 stepping 0c
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
NET: Registered protocol family 16
PCI: PCI BIOS revision 2.10 entry at 0xfb360, last bus=1
PCI: Using configuration type 1
mtrr: v2.0 (20020519)
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
Initializing Cryptographic API
Limiting direct PCI/PCI transfers.
Activating ISA DMA hang workarounds.
Real Time Clock Driver v1.12
Serial: 8250/16550 driver $Revision: 1.90 $ 48 ports, IRQ sharing enabled
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A
Using anticipatory io scheduler
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
e100: Intel(R) PRO/100 Network Driver, 3.0.17
e100: Copyright(c) 1999-2004 Intel Corporation
e100: eth0: e100_pr obe: addr 0xdd201000, irq 9, MAC addr 00:02:A5:13:65:A8
e100: eth1: e100_probe: addr 0xdd200000, irq 10, MAC addr 00:02:A5:13:65:A9
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX3: IDE controller at PCI slot 0000:00:07.1
PIIX3: chipset revision 0
PIIX3: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
hda: Maxtor 91080D5, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: max request size: 128KiB
hda: 21095424 sectors (10800 MB) w/512KiB Cache, CHS=20928/16/63, (U)DMA
 hda: hda1 hda2
hdc: ATAPI 8X CD-ROM drive, 128kB Cache, DMA
Uniform CD-ROM driver Revision: 3.20
mice: PS/2 mouse device common for all mice
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
input: AT Translated Set 2 keyboard on isa0060/serio0
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind 4096)
ip_conntrack version 2.1 (256 buckets, 2048 max) - 296 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
ipt_recent v0.3.1: Stephen Frost <sfrost@snowman.net>.  http://snowman.net/projects/ipt_recent/
arp_tables: (C) 2002 David S. Miller
NET: Registered protocol family 17
EXT3-fs: INFO: recovery required on readonly filesystem.
EXT3-fs: write access will be enabled during recovery.
kjournald starting.  Commit interval 5 seconds
EXT3-fs: recovery complete.
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 300k freed
Adding 124952k swap on /dev/hda1.  Priority:-1 extents:1
EXT3 FS on hda2, internal journal
e100: eth0: e100_watchdog: link up, 100Mbps, full-duplex
e100: eth1: e100_watchdog: link up, 100Mbps, full-duplex
ip addr:
1: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:02:a5:13:65:a8 brd ff:ff:ff:ff:ff:ff
    inet brd scope global eth0
2: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:02:a5:13:65:a9 brd ff:ff:ff:ff:ff:ff
    inet brd scope global eth1
3: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet scope host lo

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