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Re: Flooding TCP connection

From: "Atte Peltomaki" <koston@xxxxxx>
Date: Wed, 23 Mar 2005 20:45:20 +0200

> :I only pasted two lines becuse that was the only tcpdump output I got.
> :(Just many many more lines like that).
> :
> :I can easily reproduce the problem at least by having an open ssh
> :connection (via F-Secure SSH) and then disabling packet filter. I can
> :also try OpenSSH if you think it's worth the time. 
> :
> :Last time this happened yesterday, after the flooding stopped my whole 
> :box turned numb, all old connections worked but no new ones could be
> :made.
> :
> :I also compiled world yesterday to see if it helps. 
>     Atte, could you post your dmesg output (var/run/dmesg.boot) ?
>     If you are running an old kernel or a stable kernel, please update to
>     the latest HEAD and see if the problem still occurs.

Yeah, I just compiled world from latest cvs sources yesterday.

Here's the dmesg:

Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights
DragonFly 1.1-UNKNOWN #3: Tue Mar 22 17:54:50 2005
TSC clock: 797951049 Hz, i8254 clock: 1193164 Hz
CPU: Intel Pentium III (797.96-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x683  Stepping = 3
real memory  = 536469504 (523896K bytes)
avail memory = 512593920 (500580K bytes)
Changing APIC ID for IO APIC #0 from 0 to 2 on chip
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
DragonFly/MP: Multiprocessor motherboard
 cpu0 (BSP): apic id:  0, version: 0x00040011, at 0xfee00000
 cpu1 (AP):  apic id:  1, version: 0x00040011, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x00170020, at 0xfec00000
Preloaded elf kernel "/kernel" at 0xc050e000.
Preloaded elf module "/modules/acpi.ko" at 0xc050e1e8.
Pentium Pro MTRR support enabled
md0: Malloc disk
pcibios: BIOS version 2.10
Using $PIR table, 12 entries at 0xc00fbb00
npx0: <math processor> on motherboard
npx0: INT 16 interface
Using MMX optimized bcopy/copyin/copyout
acpi0: <DELL WS 420 > on motherboard
installed MI handler for int 9
acpi0: Power Button (fixed)
cpu0: <ACPI CPU> on acpi0
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
IOAPIC #0 intpin 19 -> irq 2
IOAPIC #0 intpin 17 -> irq 13
agp0: <Intel 82840 host to AGP bridge> mem 0xf0000000-0xf3ffffff at
device 0.0 on pci0
pcib1: <PCI to PCI bridge (vendor=8086 device=1a23)> at device 1.0 on
pci1: <PCI bus> on pcib1
pci1: <Matrox MGA G400 AGP graphics accelerator> at 0.0 irq 16
pcib2: <Intel 82801AA (ICH) Hub to PCI bridge> at device 30.0 on pci0
pci2: <PCI bus> on pcib2
xl0: <3Com 3c905C-TX Fast Etherlink XL> port 0xdc80-0xdcff mem
 irq 16 at device 4.0 on pci2
miibus0: <MII bus> on xl0
xlphy0: <3c905C 10/100 internal PHY> on miibus0
xlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
xl0: MAC address: 00:b0:d0:22:26:34
installed MI handler for int 16
pcm0: <ESS Solo-1 (unknown vendor)> port
xdc20-0xdc2f,0xdc40-0xdc7f irq 13 at device 9.0 on pci2
installed MI handler for int 13
pcib3: <DEC 21152 PCI-PCI bridge> at device 14.0 on pci2
pci3: <PCI bus> on pcib3
IOAPIC #0 intpin 18 -> irq 17
ahc0: <Adaptec aic7899 Ultra160 SCSI adapter> port 0xec00-0xecff mem
ffffff irq 17 at device 10.0 on pci3
installed MI handler for int 17
aic7899: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs
ahc1: <Adaptec aic7899 Ultra160 SCSI adapter> port 0xe800-0xe8ff mem
ffefff irq 2 at device 10.1 on pci3
installed MI handler for int 2
aic7899: Ultra160 Wide Channel B, SCSI Id=7, 32/253 SCBs
isab0: <Intel 82801AA (ICH) PCI to LPC bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH ATA66 controller> port 0xffa0-0xffaf at device 31.1
on pci0
ata0: at 0x1f0 irq 14 on atapci0
installed MI handler for int 14
ata1: at 0x170 irq 15 on atapci0
installed MI handler for int 15
uhci0: <Intel 82801AA (ICH) USB controller> port 0xff80-0xff9f irq 2 at
device 31.2 
on pci0
usb0: <Intel 82801AA (ICH) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ums0: Contour Design Contour RollerMouse, rev 1.10/2.00, addr 2, iclass
ums0: 5 buttons and Z dir.
pci0: <unknown card> (vendor=0x8086, dev=0x2413) at 31.3 irq 13
orm0: <Option ROMs> at iomem
0xc0000-0xc87ff,0xc8800-0xce7ff,0xce800-0xcffff on isa0
pmtimer0 on isa0
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on
installed MI handler for int 6
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
installed MI handler for int 1
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
installed MI handler for int 4
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
installed MI handler for int 3
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 bytes threshold
ppbus0: <Parallel port bus> on ppc0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
installed MI handler for int 7
installed MI handler for int 0
APIC_IO: Testing 8254 interrupt delivery
APIC_IO: routing 8254 via IOAPIC #0 intpin 2
SMP: AP CPU #1 Launched!
ad0: 19470MB <IBM-DJNA-352030> [39560/16/63] at ata0-master UDMA66
ad1: 38172MB <MAXTOR 6L040J2> [77557/16/63] at ata0-slave UDMA66
acd0: DVD-R <HL-DT-ST DVDRAM GSA-4160B> at ata1-master PIO4
Waiting 3 seconds for SCSI devices to settle
Mounting root from ufs:/dev/da0s1a
da0 at ahc0 bus 0 target 1 lun 0
da0: <IBM DDYS-T18350N S93E> Fixed Direct Access SCSI-3 device 
da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit)
da0: 17501MB (35843670 512 byte sectors: 255H 63S/T 2231C)
da1 at ahc0 bus 0 target 8 lun 0
da1: <QUANTUM ATLAS 10K 18WLS UCHQ> Fixed Direct Access SCSI-3 device 
da1: 160.000MB/s transfers (80.000MHz, offset 31, 16bit)
da1: 17366MB (35566499 512 byte sectors: 255H 63S/T 2213C)
cd0 at ata1 bus 0 target 0 lun 0
cd0: <HL-DT-ST DVDRAM GSA-4160B A301> Removable CD-ROM SCSI-0 device 
cd0: 16.000MB/s transfers
cd0: cd present [357480 x 2048 byte records]

Atte Peltomäki             

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