Date: Mon, 17 Jul 2000 20:14:57 -0400 From: Eric Ogren <eogren@earthlink.net> To: Lars Eggert <larse@ISI.EDU> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: buildkernel failure: netinet6/esp_core.c Message-ID: <20000717201457.B4413@earthlink.net> In-Reply-To: <39736E96.1AC0917B@isi.edu>; from larse@ISI.EDU on Mon, Jul 17, 2000 at 01:37:42PM -0700 References: <39736E96.1AC0917B@isi.edu>
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On Mon, Jul 17, 2000 at 01:37:42PM -0700, Lars Eggert wrote:
> Building a kernel (config file attached) on a freshly updated -stable
> system fails with:
>
> cc -c -O3 -pipe -funroll-loops -fomit-frame-pointer -fno-builtin -Wall
^^^
Try again without using unsupported optimization parameters. (-O is the
max supported).
Eric
> -Wredundant-decls -Wnested-externs -Wstrict-prototypes
> -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
> -fformat-extensions -ansi -g -nostdinc -I- -I. -I../.. -I../../../include
> -DXBONEHACK -DMAX_GIF_NEST=2147483647 -D_KERNEL -include opt_global.h -elf
> -mpreferred-stack-boundary=2 ../../netinet6/esp_core.c
> ../../netinet6/esp_core.c: In function `esp_descbc_decrypt':
> ../../netinet6/esp_core.c:319: void value not ignored as it ought to be
> ../../netinet6/esp_core.c:238: warning: `error' might be used uninitialized
> in this function
> ../../netinet6/esp_core.c: In function `esp_descbc_encrypt':
> ../../netinet6/esp_core.c:440: void value not ignored as it ought to be
> ../../netinet6/esp_core.c:345: warning: `error' might be used uninitialized
> in this function
> ../../netinet6/esp_core.c: In function `esp_blowfish_cbc_decrypt':
> ../../netinet6/esp_core.c:571: void value not ignored as it ought to be
> ../../netinet6/esp_core.c:519: warning: `error' might be used uninitialized
> in this function
> ../../netinet6/esp_core.c: In function `esp_blowfish_cbc_encrypt':
> ../../netinet6/esp_core.c:649: void value not ignored as it ought to be
> ../../netinet6/esp_core.c:598: warning: `error' might be used uninitialized
> in this function
> ../../netinet6/esp_core.c: In function `esp_cast128cbc_decrypt':
> ../../netinet6/esp_core.c:743: void value not ignored as it ought to be
> ../../netinet6/esp_core.c:687: warning: `error' might be used uninitialized
> in this function
> ../../netinet6/esp_core.c: In function `esp_cast128cbc_encrypt':
> ../../netinet6/esp_core.c:818: void value not ignored as it ought to be
> ../../netinet6/esp_core.c:765: warning: `error' might be used uninitialized
> in this function
> ../../netinet6/esp_core.c: In function `esp_rc5cbc_decrypt':
> ../../netinet6/esp_core.c:1064: void value not ignored as it ought to be
> ../../netinet6/esp_core.c:1014: warning: `error' might be used
> uninitialized in this function
> ../../netinet6/esp_core.c: In function `esp_rc5cbc_encrypt':
> ../../netinet6/esp_core.c:1134: void value not ignored as it ought to be
> ../../netinet6/esp_core.c:1085: warning: `error' might be used
> uninitialized in this function
> *** Error code 1
>
> --
> Lars Eggert <larse@isi.edu> Information Sciences Institute
> http://www.isi.edu/~larse/ University of Southern California
> # ----------------------------------------------------------------------------
> # $RCSfile: PRECISION,v $
> #
> # $Revision: 1.20 $
> # $Author: larse $
> # $Date: 2000/07/14 00:28:49 $
> # $State: Exp $
> # ----------------------------------------------------------------------------
> # $Log: PRECISION,v $
> # Revision 1.20 2000/07/14 00:28:49 larse
> # More gifs, no AUTO_EOI1.
> #
> # Revision 1.19 2000/06/26 21:11:28 larse
> # From -stable.
> #
> # Revision 1.18 2000/06/06 21:39:39 larse
> # Systems running kernels with option NFS do not need nfsiod.
> #
> # Revision 1.17 2000/06/05 18:13:36 larse
> # Kernel working on Gateway Solo notebooks now.
> #
> # Revision 1.16 2000/06/02 01:19:17 larse
> # make.conf
> #
> # Revision 1.15 2000/05/18 17:35:13 larse
> # Enabled ATAPI DMA, speaker, perfmon, ktrace, removed some things.
> #
> # Revision 1.14 2000/04/26 23:21:50 larse
> # Enabled more IP goodies in case we need them.
> #
> # Revision 1.13 2000/04/25 18:09:28 larse
> # Support for Hauppauge cards, disabled unneeded SMB/I2C stuff.
> #
> # Revision 1.12 2000/04/21 08:20:06 larse
> # pcf caused problems on dee
> #
> # Revision 1.11 2000/04/20 08:47:03 larse
> # Enabled I2C and SMBus on the NS-8000 Gateways.
> #
> # Revision 1.10 2000/04/19 03:15:09 larse
> # Enabled memory-mapped I/O for aic SCSI adapter.
> #
> # Revision 1.9 2000/04/07 22:07:55 larse
> # More mbuf clusters, more gif interfaces, enabled SMBus.
> #
> # Revision 1.8 2000/03/31 01:21:28 larse
> # Re-enabled non-HARP ATM, HARP cannot deal with Adaptec cards.
> #
> # Revision 1.7 2000/03/30 23:03:40 larse
> # Minor changes, now works on tan (old lab host) and mul (new lab host)
> # as well has the new office machines.
> #
> # Revision 1.6 2000/03/30 14:05:32 larse
> # Switched to HARP ATM.
> #
> # Revision 1.5 2000/03/30 13:08:52 larse
> # Added options to support lab hosts (works on tan at least).
> #
> # Revision 1.4 2000/03/30 11:56:44 larse
> # Disabled firewall/divert.
> #
> # Revision 1.3 2000/03/24 11:07:29 larse
> # Enabled ATAPI DMA, gif tunnels, disabled LSSR, added PSM_HOOKRESUME.
> #
> # Revision 1.2 2000/03/21 13:50:41 larse
> # Added cvs header.
> #
> # ----------------------------------------------------------------------------
>
> # This allows you to actually store this configuration file into
> # the kernel binary itself, where it may be later read by saying:
> # strings -aout -n 3 /kernel | grep ^___ | sed -e 's/^___//' > MYKERNEL
> options INCLUDE_CONFIG_FILE # Include this file in kernel
>
> makeoptions DEBUG=-g #Build kernel with gdb(1) debug symbols
>
> machine i386
> #cpu I386_CPU
> #cpu I486_CPU
> cpu I586_CPU # for our notebooks (Solos/Librettos)
> cpu I686_CPU # for all other machines
> ident PRECISION
> maxusers 128
>
> #options MATH_EMULATE #Support for x87 emulation
> options INET #InterNETworking
> options FFS #Berkeley Fast Filesystem
> options FFS_ROOT #FFS usable as root device [keep this!]
> options MFS #Memory Filesystem
> #options MD_ROOT #MD is a potential root device
> options NFS #Network Filesystem
> #options NFS_ROOT #NFS usable as root device, NFS required
> #options MSDOSFS #MSDOS Filesystem
> #options CD9660 #ISO 9660 Filesystem
> #options CD9660_ROOT #CD-ROM usable as root, CD9660 required
> #options PROCFS #Process filesystem
> options COMPAT_43 #Compatible with BSD 4.3 [KEEP THIS!]
> options SCSI_DELAY=0 #Delay (in ms) before probing SCSI
> options UCONSOLE #Allow users to grab the console
> #options USERCONFIG #boot -c editor
> #options VISUAL_USERCONFIG #visual boot -c editor
> #options KTRACE #ktrace(1) support
> options SYSVSHM #SYSV-style shared memory
> options SYSVMSG #SYSV-style message queues
> options SYSVSEM #SYSV-style semaphores
> options P1003_1B #Posix P1003_1B real-time extentions
> options _KPOSIX_PRIORITY_SCHEDULING
>
> # To make an SMP kernel, the next two are needed
> #options SMP # Symmetric MultiProcessor Kernel
> #options APIC_IO # Symmetric (APIC) I/O
> # Optionally these may need tweaked, (defaults shown):
> #options NCPU=2 # number of CPUs
> #options NBUS=4 # number of busses
> #options NAPIC=1 # number of IO APICs
> #options NINTR=24 # number of INTs
>
> device isa
> device eisa
> device pci
>
> # Floppy drives
> device fdc0 at isa? port IO_FD1 irq 6 drq 2
> device fd0 at fdc0 drive 0
> #device fd1 at fdc0 drive 1
>
>
> # ATA and ATAPI devices
> #device ata0 at isa? port IO_WD1 irq 14
> #device ata1 at isa? port IO_WD2 irq 15
> device ata
> device atadisk # ATA disk drives
> device atapicd # ATAPI CDROM drives
> #device atapifd # ATAPI floppy drives
> #device atapist # ATAPI tape drives
> #options ATA_STATIC_ID #Static device numbering
> options ATA_ENABLE_ATAPI_DMA #Enable DMA on ATAPI devices
>
> # SCSI Controllers
> #device ahb # EISA AHA1742 family
> device ahc # AHA2940 and onboard AIC7xxx devices
> #device amd # AMD 53C974 (Teckram DC-390(T))
> #device dpt # DPT Smartcache - See LINT for options!
> #device isp # Qlogic family
> #device ncr # NCR/Symbios Logic
> #device sym # NCR/Symbios Logic (newer chipsets)
>
> #device adv0 at isa?
> #device adw
> #device bt0 at isa?
> #device aha0 at isa?
> #device aic0 at isa?
>
> # SCSI peripherals
> device scbus # SCSI bus (required)
> device da # Direct Access (disks)
> #device sa # Sequential Access (tape etc)
> device cd # CD
> #device pass # Passthrough device (direct SCSI access)
>
> # RAID controllers
> #device amr # AMI MegaRAID
> #device mlx # Mylex DAC960 family
>
> # atkbdc0 controls both the keyboard and the PS/2 mouse
> device atkbdc0 at isa? port IO_KBD
> device atkbd0 at atkbdc? irq 1
> device psm0 at atkbdc? irq 12
>
> device vga0 at isa?
>
> # splash screen/screen saver
> pseudo-device splash
>
> # syscons is the default console driver, resembling an SCO console
> device sc0 at isa?
>
> # Enable this and PCVT_FREEBSD for pcvt vt220 compatible console driver
> #device vt0 at isa?
> #options XSERVER # support for X server
> #options FAT_CURSOR # start with block cursor
> # If you have a ThinkPAD, uncomment this along with the rest of the PCVT lines
> #options PCVT_SCANSET=2 # IBM keyboards are non-std
>
> # Floating point support - do not disable.
> device npx0 at nexus? port IO_NPX irq 13
>
> # Power management support (see LINT for more options)
> device apm0 at nexus? # Advanced Power Management
>
> # PCCARD (PCMCIA) support
> device card
> device pcic0 at isa? irq ? port 0x3e0 iomem 0xd0000
> device pcic1 at isa? irq ? port 0x3e2 iomem 0xd4000 disable
>
> # Serial (COM) ports
> device sio0 at isa? port IO_COM1 flags 0x10 irq 4
> device sio1 at isa? port IO_COM2 irq 3
> device sio2 at isa? disable port IO_COM3 irq 5
> device sio3 at isa? disable port IO_COM4 irq 9
>
> # Parallel port
> device ppc0 at isa? irq 7
> 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
>
>
> # PCI Ethernet NICs.
> device de # DEC/Intel DC21x4x (``Tulip'')
> device fxp # Intel EtherExpress PRO/100B (82557, 82558)
> #device tx # SMC 9432TX (83c170 ``EPIC'')
> device vx # 3Com 3c590, 3c595 (``Vortex'')
> #device wx # Intel Gigabit Ethernet Card (``Wiseman'')
>
> # PCI Ethernet NICs that use the common MII bus controller code.
> device miibus # MII bus support
> #device dc # DEC/Intel 21143 and various workalikes
> #device rl # RealTek 8129/8139
> #device sf # Adaptec AIC-6915 (``Starfire'')
> #device sis # Silicon Integrated Systems SiS 900/SiS 7016
> #device ste # Sundance ST201 (D-Link DFE-550TX)
> #device tl # Texas Instruments ThunderLAN
> #device vr # VIA Rhine, Rhine II
> #device wb # Winbond W89C840F
> device xl # 3Com 3c90x (``Boomerang'', ``Cyclone'')
>
> # ISA Ethernet NICs.
> #device ed0 at isa? port 0x280 irq 10 iomem 0xd8000
> device ed
> #device ex
> device ep
> # WaveLAN/IEEE 802.11 wireless NICs. Note: the WaveLAN/IEEE really
> # exists only as a PCMCIA device, so there is no ISA attatement needed
> # and resources will always be dynamically assigned by the pccard code.
> #device wi
> # Aironet 4500/4800 802.11 wireless NICs. Note: the declaration below will
> # work for PCMCIA and PCI cards, as well as ISA cards set to ISA PnP
> # mode (the factory default). If you set the switches on your ISA
> # card for a manually chosen I/O address and IRQ, you must specify
> # those paremeters here.
> #device an
> # The probe order of these is presently determined by i386/isa/isa_compat.c.
> #device ie0 at isa? port 0x300 irq 10 iomem 0xd0000
> #device fe0 at isa? port 0x300
> #device le0 at isa? port 0x300 irq 5 iomem 0xd0000
> #device lnc0 at isa? port 0x280 irq 10 drq 0
> #device cs0 at isa? port 0x300
> #device sn0 at isa? port 0x300 irq 10
> # requires PCCARD (PCMCIA) support to be activated
> #device xe0 at isa?
>
> # Pseudo devices - the number indicates how many units to allocated.
> pseudo-device loop # Network loopback
> pseudo-device ether # Ethernet support
> #pseudo-device sl 1 # Kernel SLIP
> #pseudo-device ppp 1 # Kernel PPP
> pseudo-device tun # Packet tunnel.
> pseudo-device pty # Pseudo-ttys (telnet etc)
> #pseudo-device md # Memory "disks"
>
> # The `bpf' pseudo-device enables the Berkeley Packet Filter.
> # Be aware of the administrative consequences of enabling this!
> pseudo-device bpf #Berkeley packet filter
>
> # USB support
> device uhci # UHCI PCI->USB interface
> #device ohci # OHCI PCI->USB interface
> device usb # USB Bus (required)
> #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
> # USB Ethernet
> #device aue # ADMtek USB ethernet
> #device cue # CATC USB ethernet
> #device kue # Kawasaki LSI USB ethernet
>
> # CPU_DISABLE_5X86_LSSER disables load store serialize (i.e. enables
> # reorder). This option should not be used if you use memory mapped
> # I/O device(s).
> # options CPU_DISABLE_5X86_LSSER
>
> # CPU_FASTER_5X86_FPU enables faster FPU exception handler.
> options CPU_FASTER_5X86_FPU
>
> # NO_F00F_HACK disables the hack that prevents Pentiums (and ONLY
> # Pentiums) from locking up when a LOCK CMPXCHG8B instruction is
> # executed. This should be included for ALL kernels that won't run
> # on a Pentium.
> #
> # DISABLED, our notebooks (Solos/Librettos) have Pentiums!
> # options NO_F00F_HACK
>
> # Allow user-mode programs to manipulate their local descriptor tables.
> # This option is required for the WINE Windows(tm) emulator, and is
> # not used by anything else (that we know of)#
> options USER_LDT #allow user-level control of i386 ldt
>
> # TCP_DROP_SYNFIN adds support for ignoring TCP packets with SYN+FIN. This
> # prevents nmap et al. from identifying the TCP/IP stack, but breaks support
> # for RFC1644 extensions and is not recommended for web servers.
> options TCP_DROP_SYNFIN #drop TCP packets with SYN+FIN
>
> # TCP_RESTRICT_RST adds support for blocking the emission of TCP RST packets.
> # This is useful on systems which are exposed to SYN floods (e.g. IRC servers)
> # or any system which one does not want to be easily portscannable.
> options TCP_RESTRICT_RST #restrict emission of TCP RST
>
> options IPSEC #IP security
> options IPSEC_ESP #IP security (crypto; define w/ IPSEC)
>
> options INET6 #IPv6 communications protocols
>
> # The `gif' pseudo-device implements IPv6 over IP4 tunneling,
> # IPv4 over IPv6 tunneling, IPv4 over IPv4 tunneling and
> # IPv6 over IPv6 tunneling.
> pseudo-device gif 32 #IPv6 and IPv4 tunneling
>
> # The `faith' pseudo-device captures packets sent to it and diverts them
> # to the IPv4/IPv6 translation daemon.
> #pseudo-device faith 1 #for IPv6 and IPv4 translation
>
> # IPFIREWALL enables support for IP firewall construction, in
> # conjunction with the `ipfw' program. IPFIREWALL_VERBOSE sends
> # logged packets to the system logger. IPFIREWALL_VERBOSE_LIMIT
> # limits the number of times a matching entry can be logged.
> options IPFIREWALL #firewall
> options IPFIREWALL_VERBOSE #print information about
> # dropped packets
> options IPFIREWALL_FORWARD #enable transparent proxy support
> options IPFIREWALL_VERBOSE_LIMIT=1000 #limit verbosity
> options IPV6FIREWALL #firewall for IPv6
> options IPV6FIREWALL_VERBOSE
> options IPV6FIREWALL_VERBOSE_LIMIT=1000
>
> # IPFIREWALL_DEFAULT_TO_ACCEPT causes the default rule (at boot) to
> # allow everything. Use with care, if a cracker can crash your
> # firewall machine, they can get to your protected machines. However,
> # if you are using it as an as-needed filter for specific problems as
> # they arise, then this may be for you. Changing the default to 'allow'
> # means that you won't get stuck if the kernel and /sbin/ipfw binary get
> # out of sync.
> options IPFIREWALL_DEFAULT_TO_ACCEPT #allow everything by default
> options IPV6FIREWALL_DEFAULT_TO_ACCEPT
>
> # ICMP_BANDLIM enables icmp error response bandwidth limiting. You
> # typically want this option as it will help protect the machine from
> # D.O.S. packet attacks.
> options ICMP_BANDLIM
>
> # DUMMYNET enables the "dummynet" bandwidth limiter. You need
> # IPFIREWALL as well. See the dummynet(4) manpage for more info.
> options DUMMYNET
>
> # BRIDGE enables bridging between ethernet cards -- see bridge(4).
> # You can use IPFIREWALL and dummynet together with bridging.
> #options BRIDGE
>
> # IPDIVERT enables the divert IP sockets, used by ``ipfw divert''
> options IPDIVERT #divert sockets
>
> # MROUTING enables the kernel multicast packet forwarder, which works
> # with mrouted(8).
> options MROUTING # Multicast routing
>
> # IPSTEALTH enables code to support stealth forwarding (i.e., forwarding
> # packets without touching the ttl). This can be useful to hide firewalls
> # from traceroute and similar tools.
> options IPSTEALTH #support for stealth forwarding
>
> options IPFILTER #ipfilter support
> options IPFILTER_LOG #ipfilter logging
>
>
> # Soft updates is technique for improving file system speed and
> # making abrupt shutdown less risky. It is not enabled by default due
> # to copyright restraints on the code that implement it.
> #
> # Read ../../ufs/ffs/README.softupdates to learn what you need to
> # do to enable this. ../../contrib/softupdates/README gives
> # more details on how they actually work.
> options SOFTUPDATES
>
> pseudo-device speaker #Play IBM BASIC-style noises out your speaker
> pseudo-device gzip #Exec gzipped a.out's
> #pseudo-device vn #Vnode driver (turns a file into a device)
>
> # AUTO_EOI_1 enables the `automatic EOI' feature for the master 8259A
> # interrupt controller. This saves about 0.7-1.25 usec for each interrupt.
> # This option breaks suspend/resume on some portables.
> # THIS BREAKS SLEEP SUPPORT ON THE SONY LAPTOPS, POSSIBLY OTHERS.
> #options AUTO_EOI_1
>
> # To include support for VESA video modes
> options VESA
>
> options SC_HISTORY_SIZE=2000 # number of history buffer lines
> options SC_PIXEL_MODE # add support for the raster text mode
>
> # The newpcm driver (use INSTEAD of snd0 and all VOXWARE drivers!).
> # Note that motherboard sound devices may require options PNPBIOS.
> #
> # Supported cards include:
> # Creative SoundBlaster ISA PnP/non-PnP
> # Supports ESS and Avance ISA chips as well.
> # Gravis UltraSound ISA PnP/non-PnP
> # Crystal Semiconductor CS461x/428x PCI
> # Neomagic 256AV (ac97)
> # Most of the more common ISA/PnP sb/mss/ess compatable cards.
> # For PnP/PCI sound cards
> device pcm
> options PNPBIOS
>
> device joy0 at isa? port IO_GAME
>
> # Add support for the EXT2FS filesystem of Linux fame. Be a bit
> # careful with this - the ext2fs code has a tendency to lag behind
> # changes and not be exercised very much, so mounting read/write could
> # be dangerous (and even mounting read only could result in panics.)
> options EXT2FS
>
> # Enable the kernel debugger.
> options DDB
>
> # Options for psm:
> options PSM_HOOKRESUME #hook the system resume event, useful
> #for some laptops
> options PSM_RESETAFTERSUSPEND #reset the device at the resume event
>
> # ATM related options
> #
> # The `en' device provides support for Efficient Networks (ENI)
> # ENI-155 PCI midway cards, and the Adaptec 155Mbps PCI ATM cards (ANA-59x0).
> #
> # atm pseudo-device provides generic atm functions and is required for
> # atm devices.
> # NATM enables the netnatm protocol family that can be used to
> # bypass TCP/IP.
> #
> # the current driver supports only PVC operations (no atm-arp, no multicast).
> # for more details, please read the original documents at
> # http://www.ccrc.wustl.edu/pub/chuck/tech/bsdatm/bsdatm.html
> #
> pseudo-device atm
> device en
> options NATM
>
> # The 'bktr' device is a PCI video capture device using the Brooktree
> # bt848/bt848a/bt849a/bt878/bt879 chipset. When used with a TV Tuner it forms a
> # TV card, eg Miro PC/TV, Hauppauge WinCast/TV WinTV, VideoLogic Captivator,
> # Intel Smart Video III, AverMedia, IMS Turbo, FlyVideo.
> #
> # Brooktree driver has been ported to the new I2C framework. Thus,
> # you'll need to have the following 3 lines in the kernel config.
> # device smbus
> # device iicbus
> # device iicbb
> # The iic and smb devices are only needed if you want to control other
> # I2C slaves connected to the external connector of some cards.
> device bktr
>
> # The aic7xxx driver will attempt to use memory mapped I/O for all PCI
> # controllers that have it configured only if this option is set. Unfortunately,
> # this doesn't work on some motherboards, which prevents it from being the
> # default.
> options AHC_ALLOW_MEMIO
>
> # KTRACE enables the system-call tracing facility ktrace(2).
> options KTRACE #kernel tracing
>
> # PERFMON causes the driver for Pentium/Pentium Pro performance counters
> # to be compiled. See perfmon(4) for more information.
> options PERFMON
>
> # pca: PCM audio through your PC speaker
> # Not controlled by `snd'
> device pca0 at isa? port IO_TIMER1
>
> options PPC_PROBE_CHIPSET # Enable chipset specific detection
> # (see flags in ppc(4))
>
> # If you are running a machine just as a fileserver for PC and MAC
> # users, using SAMBA or Netatalk, you may consider setting this option
> # and keeping all those users' directories on a filesystem that is
> # mounted with the suiddir option. This gives new files the same
> # ownership as the directory (similar to group). It's a security hole
> # if you let these users run programs, so confine it to file-servers
> # (but it'll save you lots of headaches in those cases). Root owned
> # directories are exempt and X bits are cleared. The suid bit must be
> # set on the directory as well; see chmod(1) PC owners can't see/set
> # ownerships so they keep getting their toes trodden on. This saves
> # you all the support calls as the filesystem it's used on will act as
> # they expect: "It's my dir so it must be my file".
> options SUIDDIR
>
> # allow recursive gif tunnels this many levels deep
> options MAX_GIF_NEST=2147483647 # 2147483647 = INT_MAX
>
> # allow multiple tunnels between same two physical interfaces
> options XBONEHACK
>
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