Weird "ignoring syn" problem

[David Cornejo]

This may not be related, but I have a Soekris 4801 running CURRENT 
that with a GENERIC kernel exhibits the behavior where TCP connects 
don't happen.  If I switch to an old kernel config file, it works..

This failure happens between this box and a RELENG_6 (updated last 
week), another CURRENT box, and a Windows XP machine.

If I ssh back into the 4801 from the console it works ok, as someone 
earlier mentioned.

I also have tcpdumps from the 4801 to the RELENG_6 box if anyone 
wants to see them...

dave c


=== old config file ===

cpu             I586_CPU
cpu             I686_CPU
ident           S4801

# 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_ULE               # ULE scheduler
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         COMPAT_43               # Compatible with BSD 4.3 [KEEP THIS!]
options         COMPAT_43TTY            # BSD 4.3 TTY compat [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         STOP_NMI                # Stop CPUS using NMI instead of IPI

# Debugging for use in -current
options         KDB                     # Enable kernel debugger support.
options         DDB                     # Support DDB.
options         GDB                     # Support remote GDB.

options         CONSPEED=19200
options         CPU_GEODE

# To make an SMP kernel, the next two lines are needed
#options        SMP                     # Symmetric MultiProcessor Kernel
#device         apic                    # I/O APIC

# Bus support.
device          pci

# ATA and ATAPI devices
device          ata
device          atadisk         # ATA disk drives
device          atapicd         # ATAPI CDROM drives
options         ATA_STATIC_ID   # Static device numbering

# 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)

# 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          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
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

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

# 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 sio, uart and/or ppc drivers):
#device         puc

device          miibus          # MII bus support
device          sis             # Silicon Integrated Systems SiS 900/SiS 7016

# Pseudo devices.
device          loop            # Network loopback
device          random          # Entropy device
device          ether           # Ethernet support
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          wlan
device          wlan_wep
device          wlan_tkip
device          wlan_ccmp
device          wlan_xauth
device          wlan_acl

device          ath
device          ath_hal
device          ath_rate_sample