есть рабочее и некоторое время назад пересобранное из GENERIC, ядро BRIDGE:

cat BRIDGE
#
# GENERIC -- Generic kernel configuration file for FreeBSD/i386
#
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#
#    http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/handbook/ke...
#
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
# latest information.
#
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the ../../conf/NOTES and NOTES files.
# If you are in doubt as to the purpose or necessity of a line, check first
# in NOTES.
#
# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.429.2.13 2006/10/09 18:41:36 simon Exp $

machine         i386
cpu             I486_CPU
cpu             I586_CPU
cpu             I686_CPU
ident           GENERIC

# To statically compile in device wiring instead of /boot/device.hints
#hints          "GENERIC.hints"         # Default places to look for devices.

makeoptions     DEBUG=-g                # Build kernel with gdb(1) debug symbols

options         SCHED_4BSD              # 4BSD scheduler
options         PREEMPTION              # Enable kernel thread preemption
options         INET                    # InterNETworking
options         INET6                   # IPv6 communications protocols
options         FFS                     # Berkeley Fast Filesystem
options         SOFTUPDATES             # Enable FFS soft updates support
options         UFS_ACL                 # Support for access control lists
options         UFS_DIRHASH             # Improve performance on big directories
options         MD_ROOT                 # MD is a potential root device
options         NFSCLIENT               # Network Filesystem Client
options         NFSSERVER               # Network Filesystem Server
options         NFS_ROOT                # NFS usable as /, requires NFSCLIENT
options         MSDOSFS                 # MSDOS Filesystem
options         CD9660                  # ISO 9660 Filesystem
options         PROCFS                  # Process filesystem (requires PSEUDOFS)
options         PSEUDOFS                # Pseudo-filesystem framework
options         GEOM_GPT                # GUID Partition Tables.
options         COMPAT_43               # Compatible with BSD 4.3 [KEEP THIS!]
options         COMPAT_FREEBSD4         # Compatible with FreeBSD4
options         COMPAT_FREEBSD5         # Compatible with FreeBSD5
options         SCSI_DELAY=5000         # Delay (in ms) before probing SCSI
options         KTRACE                  # ktrace(1) support
options         SYSVSHM                 # SYSV-style shared memory
options         SYSVMSG                 # SYSV-style message queues
options         SYSVSEM                 # SYSV-style semaphores
options         _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev
options         ADAPTIVE_GIANT          # Giant mutex is adaptive.
options         IPFIREWALL
options         IPFIREWALL_VERBOSE
options         BRIDGE

device          apic                    # I/O APIC

# Bus support.
device          eisa
device          pci

# Floppy drives
device          fdc

# ATA and ATAPI devices
device          ata
device          atadisk         # ATA disk drives
device          ataraid         # ATA RAID drives
device          atapicd         # ATAPI CDROM drives
device          atapifd         # ATAPI floppy drives
device          atapist         # ATAPI tape drives
options         ATA_STATIC_ID   # Static device numbering

# SCSI Controllers
device          ahb             # EISA AHA1742 family
device          ahc             # AHA2940 and onboard AIC7xxx devices
options         AHC_REG_PRETTY_PRINT    # Print register bitfields in debug
                                        # output.  Adds ~128k to driver.
device          ahd             # AHA39320/29320 and onboard AIC79xx devices
options         AHD_REG_PRETTY_PRINT    # Print register bitfields in debug
                                        # output.  Adds ~215k to driver.
device          amd             # AMD 53C974 (Tekram DC-390(T))
device          isp             # Qlogic family
#device         ispfw           # Firmware for QLogic HBAs- normally a module
device          mpt             # LSI-Logic MPT-Fusion
#device         ncr             # NCR/Symbios Logic
device          sym             # NCR/Symbios Logic (newer chipsets + those of `ncr')
device          trm             # Tekram DC395U/UW/F DC315U adapters

device          adv             # Advansys SCSI adapters
device          adw             # Advansys wide SCSI adapters
device          aha             # Adaptec 154x SCSI adapters
device          aic             # Adaptec 15[012]x SCSI adapters, AIC-6[23]60.
device          bt              # Buslogic/Mylex MultiMaster SCSI adapters

device          ncv             # NCR 53C500
device          nsp             # Workbit Ninja SCSI-3
device          stg             # TMC 18C30/18C50

# SCSI peripherals
device          scbus           # SCSI bus (required for SCSI)
device          ch              # SCSI media changers
device          da              # Direct Access (disks)
device          sa              # Sequential Access (tape etc)
device          cd              # CD
device          pass            # Passthrough device (direct SCSI access)
device          ses             # SCSI Environmental Services (and SAF-TE)

# RAID controllers interfaced to the SCSI subsystem
device          amr             # AMI MegaRAID
device          arcmsr          # Areca SATA II RAID
device          asr             # DPT SmartRAID V, VI and Adaptec SCSI RAID
device          ciss            # Compaq Smart RAID 5*
device          dpt             # DPT Smartcache III, IV - See NOTES for options
device          hptmv           # Highpoint RocketRAID 182x
device          rr232x          # Highpoint RocketRAID 232x
device          iir             # Intel Integrated RAID
device          ips             # IBM (Adaptec) ServeRAID
device          mly             # Mylex AcceleRAID/eXtremeRAID
device          twa             # 3ware 9000 series PATA/SATA RAID

# RAID controllers
device          aac             # Adaptec FSA RAID
device          aacp            # SCSI passthrough for aac (requires CAM)
device          ida             # Compaq Smart RAID
device          mfi             # LSI MegaRAID SAS
device          mlx             # Mylex DAC960 family
device          pst             # Promise Supertrak SX6000
device          twe             # 3ware ATA RAID

# atkbdc0 controls both the keyboard and the PS/2 mouse
device          atkbdc          # AT keyboard controller
device          atkbd           # AT keyboard
device          psm             # PS/2 mouse

device          kbdmux          # keyboard multiplexer

device          vga             # VGA video card driver

device          splash          # Splash screen and screen saver support

# syscons is the default console driver, resembling an SCO console
device          sc

# Enable this for the pcvt (VT220 compatible) console driver
#device         vt
#options        XSERVER         # support for X server on a vt console
#options        FAT_CURSOR      # start with block cursor

device          agp             # support several AGP chipsets

# Power management support (see NOTES for more options)
#device         apm
# Add suspend/resume support for the i8254.
device          pmtimer

# PCCARD (PCMCIA) support
# PCMCIA and cardbus bridge support
device          cbb             # cardbus (yenta) bridge
device          pccard          # PC Card (16-bit) bus
device          cardbus         # CardBus (32-bit) bus

# Serial (COM) ports
device          sio             # 8250, 16[45]50 based serial ports

# Parallel port
device          ppc
device          ppbus           # Parallel port bus (required)
device          lpt             # Printer
device          plip            # TCP/IP over parallel
device          ppi             # Parallel port interface device
#device         vpo             # Requires scbus and da

# If you've got a "dumb" serial or parallel PCI card that is
# supported by the puc(4) glue driver, uncomment the following
# line to enable it (connects to the sio and/or ppc drivers):
#device         puc

# PCI Ethernet NICs.
device          de              # DEC/Intel DC21x4x (``Tulip'')
device          em              # Intel PRO/1000 adapter Gigabit Ethernet Card
device          ixgb            # Intel PRO/10GbE Ethernet Card
device          txp             # 3Com 3cR990 (``Typhoon'')
device          vx              # 3Com 3c590, 3c595 (``Vortex'')

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device          miibus          # MII bus support
device          bce             # Broadcom BCM5706/BCM5708 Gigabit Ethernet
device          bfe             # Broadcom BCM440x 10/100 Ethernet
device          bge             # Broadcom BCM570xx Gigabit Ethernet
device          dc              # DEC/Intel 21143 and various workalikes
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
device          lge             # Level 1 LXT1001 gigabit Ethernet
device          nge             # NatSemi DP83820 gigabit Ethernet
device          nve             # nVidia nForce MCP on-board Ethernet Networking
device          pcn             # AMD Am79C97x PCI 10/100(precedence over 'lnc')
device          re              # RealTek 8139C+/8169/8169S/8110S
device          rl              # RealTek 8129/8139
device          sf              # Adaptec AIC-6915 (``Starfire'')
device          sis             # Silicon Integrated Systems SiS 900/SiS 7016
device          sk              # SysKonnect SK-984x & SK-982x gigabit Ethernet
device          ste             # Sundance ST201 (D-Link DFE-550TX)
device          stge            # Sundance/Tamarack TC9021 gigabit Ethernet
device          ti              # Alteon Networks Tigon I/II gigabit Ethernet
device          tl              # Texas Instruments ThunderLAN
device          tx              # SMC EtherPower II (83c170 ``EPIC'')
device          vge             # VIA VT612x gigabit Ethernet
device          vr              # VIA Rhine, Rhine II
device          wb              # Winbond W89C840F
device          xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')

# ISA Ethernet NICs.  pccard NICs included.
device          cs              # Crystal Semiconductor CS89x0 NIC
# 'device ed' requires 'device miibus'
device          ed              # NE[12]000, SMC Ultra, 3c503, DS8390 cards
device          ex              # Intel EtherExpress Pro/10 and Pro/10+
device          ep              # Etherlink III based cards
device          fe              # Fujitsu MB8696x based cards
device          ie              # EtherExpress 8/16, 3C507, StarLAN 10 etc.
device          lnc             # NE2100, NE32-VL Lance Ethernet cards
device          sn              # SMC's 9000 series of Ethernet chips
device          xe              # Xircom pccard Ethernet

# Wireless NIC cards
device          wlan            # 802.11 support
device          wlan_wep        # 802.11 WEP support
device          wlan_ccmp       # 802.11 CCMP support
device          wlan_tkip       # 802.11 TKIP support
device          an              # Aironet 4500/4800 802.11 wireless NICs.
device          ath             # Atheros pci/cardbus NIC's
device          ath_hal         # Atheros HAL (Hardware Access Layer)
device          ath_rate_sample # SampleRate tx rate control for ath
device          awi             # BayStack 660 and others
device          ral             # Ralink Technology RT2500 wireless NICs.
device          wi              # WaveLAN/Intersil/Symbol 802.11 wireless NICs.
#device         wl              # Older non 802.11 Wavelan wireless NIC.

# Pseudo devices.
device          loop            # Network loopback
device          random          # Entropy device
device          ether           # Ethernet support
device          sl              # Kernel SLIP
device          ppp             # Kernel PPP
device          tun             # Packet tunnel.
device          pty             # Pseudo-ttys (telnet etc)
device          md              # Memory "disks"
device          gif             # IPv6 and IPv4 tunneling
device          faith           # IPv6-to-IPv4 relaying (translation)

# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
# Note that 'bpf' is required for DHCP.
device          bpf             # Berkeley packet filter

# USB support
device          uhci            # UHCI PCI->USB interface
device          ohci            # OHCI PCI->USB interface
device          ehci            # EHCI PCI->USB interface (USB 2.0)
device          usb             # USB Bus (required)
#device         udbp            # USB Double Bulk Pipe devices
device          ugen            # Generic
device          uhid            # "Human Interface Devices"
device          ukbd            # Keyboard
device          ulpt            # Printer
device          umass           # Disks/Mass storage - Requires scbus and da
device          ums             # Mouse
device          ural            # Ralink Technology RT2500USB wireless NICs
device          urio            # Diamond Rio 500 MP3 player
device          uscanner        # Scanners
# USB Ethernet, requires miibus
device          aue             # ADMtek USB Ethernet
device          axe             # ASIX Electronics USB Ethernet
device          cdce            # Generic USB over Ethernet
device          cue             # CATC USB Ethernet
device          kue             # Kawasaki LSI USB Ethernet
device          rue             # RealTek RTL8150 USB Ethernet

# FireWire support
device          firewire        # FireWire bus code
device          sbp             # SCSI over FireWire (Requires scbus and da)
device          fwe             # Ethernet over FireWire (non-standard!)

Понадобилось пересобрать ядро, добавив пару опций... но при команде config BRIDGE ругается: unknown option "BRIDGE"

В чем проблема?