System drops off net

Bill Moran wmoran at
Wed Apr 9 05:38:09 PDT 2003

Chris Miller wrote:
> I just installed 4.7-RELEASE-p10 on a Dell Poweredge 4350 server with dual
> (but only one used) Intel 82555 10/100 nics (fxp driver). Ssh sessions
> intermittantly terminate (on the remote side, still alive on the machine)
> and the machine becomes unresponsive to new ssh sessions. If I ping the
> machine it seems to wake back up and allow new ssh sessions. No errors,
> nothing in the logs. I've had ssh sessions that last 24 hours and others
> that die after an hour. I didn't see anything in the email archives.
> Ideas? Dmesg output below.

What kind of switch are you using?  The only time I've seen behaviour like
this is with a switch that automatically shut off port that had a high
percentage of broadcast traffic (attempting to prevent broadcast storms,
I guess?)  During light load periods, the NMB chatter from the windows
machines would cause just about all the ports to shut off, and the only
way to restore it was to ping from the shut off machines to turn the
port back on.  Not sure if this is your problem ... but something to check.

Aside from that ... is there an inactivity timeout on one end of the ssh
connection or the other?

> Regards,
>         Chris
> Copyright (c) 1992-2002 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
>         The Regents of the University of California. All rights reserved.
> FreeBSD 4.7-RELEASE-p10 #0: Fri Apr  4 13:42:30 PST 2003
>     root at localhost:/usr/obj/usr/src/sys/GENERIC
> Timecounter "i8254"  frequency 1193182 Hz
> CPU: Pentium III/Pentium III Xeon/Celeron (498.75-MHz 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0x673  Stepping = 3
> real memory  = 536862720 (524280K bytes)
> avail memory = 517185536 (505064K bytes)
> Preloaded elf kernel "kernel" at 0xc050f000.
> Pentium Pro MTRR support enabled
> md0: Malloc disk
> Using $PIR table, 9 entries at 0xc00fc7c0
> npx0: <math processor> on motherboard
> npx0: INT 16 interface
> pcib0: <Intel 82443GX host to PCI bridge> on motherboard
> pci0: <PCI bus> on pcib0
> pcib2: <Intel 82443GX (440 GX) PCI-PCI (AGP) bridge> at device 1.0 on pci0
> pci1: <PCI bus> on pcib2
> pci1: <ATI Mach64-GD graphics accelerator> at 0.0
> pcib3: <DEC 21152 PCI-PCI bridge> at device 2.0 on pci0
> pci2: <PCI bus> on pcib3
> ahc0: <Adaptec aic7860 Ultra SCSI adapter> port 0xec00-0xecff mem
> 0xf9fff000-0xf9ffffff irq 10 at device 6.0 on pci2
> aic7860: Ultra Single Channel A, SCSI Id=7, 3/253 SCBs
> pcib4: <PCI to PCI bridge (vendor=8086 device=0960)> at device 13.0 on
> pci2
> pci3: <PCI bus> on pcib4
> amr0: <AMI MegaRAID> mem 0xf6c00000-0xf6ffffff irq 5 at device 13.1 on
> pci2
> amr0: <Series 466> Firmware 3.13, BIOS 1.43, 16MB RAM
> isab0: <Intel 82371AB PCI to ISA bridge> at device 7.0 on pci0
> isa0: <ISA bus> on isab0
> atapci0: <Intel PIIX4 ATA33 controller> at device 7.1 on pci0
> atapci0: ATA channel disabled by BIOS
> uhci0: <Intel 82371AB/EB (PIIX4) USB controller> irq 0 at device 7.2 on
> pci0
> uhci0: Could not map ports
> device_probe_and_attach: uhci0 attach returned 6
> chip1: <Intel 82371AB Power management controller> port 0x850-0x85f at
> device 7.3 on pci0
> fxp0: <Intel Pro 10/100B/100+ Ethernet> port 0xdcc0-0xdcff mem
> 0xfe100000-0xfe1fffff,0xfe201000-0xfe201fff irq 14 at device 8.0 on pci0
> fxp0: Ethernet address omitted
> inphy0: <i82555 10/100 media interface> on miibus0
> inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
> fxp1: <Intel Pro 10/100B/100+ Ethernet> port 0xdc80-0xdcbf mem
> 0xfe000000-0xfe0fffff,0xfe200000-0xfe200fff irq 11 at device 10.0 on pci0
> fxp1: Ethernet address omitted
> inphy1: <i82555 10/100 media interface> on miibus1
> inphy1:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
> pcib1: <Intel 82443GX host to AGP bridge> on motherboard
> pci4: <PCI bus> on pcib1
> orm0: <Option ROMs> at iomem 0xc0000-0xc7fff,0xcc000-0xcc7ff on isa0
> fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
> fdc0: FIFO enabled, 8 bytes threshold
> fd0: <1440-KB 3.5" drive> on fdc0 drive 0
> ata0 at port 0x1f0-0x1f7,0x3f6 irq 14 on isa0
> ata1 at port 0x170-0x177,0x376 irq 15 on isa0
> atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
> atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
> kbd0 at atkbd0
> vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
> 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
> sio1 at port 0x2f8-0x2ff irq 3 on isa0
> sio1: type 16550A
> 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
> plip0: <PLIP network interface> on ppbus0
> lpt0: <Printer> on ppbus0
> lpt0: Interrupt-driven port
> ppi0: <Parallel I/O> on ppbus0
> Waiting 15 seconds for SCSI devices to settle
> amrd0: <MegaRAID logical drive> on amr0
> amrd0: 51834MB (106156032 sectors) RAID 0 (optimal)
> Mounting root from ufs:/dev/amrd0s1a
> cd0 at ahc0 bus 0 target 5 lun 0
> cd0: <NEC CD-ROM DRIVE:466 1.06> Removable CD-ROM SCSI-2 device
> cd0: 20.000MB/s transfers (20.000MHz, offset 15)
> cd0: Attempt to query device size failed: NOT READY, Medium not present

Bill Moran
Potential Technologies

More information about the freebsd-questions mailing list