Dear freebsd-current,

Any suggestions you have regarding this problem would be
much appreciated.

My laptop running -CURRENT is suddenly generating bad TCP
checksums when talking to some IPs but not others.  For
example, is a problem,

    17:08:47.026823 > S
    [bad tcp cksum fffe!] 3868790363:3868790363(0) win 65535
    <mss 1460,nop,wscale 1,nop,nop,timestamp 542813 0,nop,nop,ccnew 10>
    (DF) (ttl 64, id 347, len 68)

    17:08:50.676968 > S
    [bad tcp cksum fffe!] 3810151152:3810151152(0) win 65535
    <mss 1460,nop,wscale 1,nop,nop,timestamp 543178 0,nop,nop,ccnew 11>
    (DF) (ttl 64, id 348, len 68)

but is fine.

    17:08:56.686832 > S
    [tcp sum ok] 2395865513:2395865513(0) win 65535
    <mss 1460,nop,wscale 1,nop,nop,timestamp 543779 0,nop,nop,ccnew 12>
    (DF) (ttl 64, id 349, len 68)

    17:08:56.689644 > S
    [tcp sum ok] 990076085:990076085(0) ack 2395865514 win 10136
    <nop,nop,timestamp 595991654 543779,nop,wscale 0,mss 1460>
    (ttl 254, id 7165, len 60)

    17:08:56.689991 > .
    [tcp sum ok] ack 1 win 33304
    <nop,nop,timestamp 543779 595991654> (DF) (ttl 64, id 350, len 52)

It doesn't matter whether net.inet.tcp.rfc1323 and
net.inet.tcp.rfc1644 are off or on.  My dmesg is below.


Copyright (c) 1992-2001 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 5.0-CURRENT #24: Tue May 14 15:34:56 EST 2002
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium/P55C (quarter-micron) (298.42-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x582  Stepping = 2
real memory  = 134152192 (131008K bytes)
avail memory = 126439424 (123476K bytes)
Preloaded elf kernel "kernel" at 0xc040b000.
Intel Pentium detected, installing workaround for F00F bug
Using $PIR table, 4 entries at 0xc00fdf80
apm0: <APM BIOS> on motherboard
apm0: found APM BIOS v1.2, connected at v1.2
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0xfcf0-0xfcff at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
uhci0: <Intel 82371AB/EB (PIIX4) USB controller> at device 7.2 on pci0
uhci0: Could not map ports
device_probe_and_attach: uhci0 attach returned 6
pci0: <bridge, PCI-unknown> at 7.3 (no driver attached)
pci0: <display, VGA> at 8.0 (no driver attached)
pci0: <serial bus, FireWire> at 9.0 (no driver attached)
pci_cfgintr_unique: hard-routed to irq 9
pci_cfgintr: 0:10 INTA routed to irq 9
pcic0: <Ricoh RL5C475 PCI-CardBus Bridge> irq 9 at device 10.0 on pci0
pcic0: PCI Memory allocated: 0x44000000
pccard0: <PC Card bus (classic)> on pcic0
orm0: <Option ROM> at iomem 0xc0000-0xcbfff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model VersaPad, device ID 0
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
pmtimer0 on isa0
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
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
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
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
unknown: <PNP0303> can't assign resources
sbc0: <ESS ES1879> at port 0x220-0x22f,0x388-0x38b,0x320-0x321 irq 5 drq 1,5 on isa0
pcm0: <ESS 18xx DSP> on sbc0
midi0: <SB Midi Interface> on sbc0
midi1: <SB OPL FM Synthesizer> on sbc0
unknown: <PNP0700> can't assign resources
unknown: <PNP0401> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <ROK0010> can't assign resources
unknown: <PNP0f13> can't assign resources
IP packet filtering initialized, divert enabled, rule-based forwarding enabled, 
default to deny, logging limited to 1000 packets/entry by default
IPv6 packet filtering initialized, logging limited to 1000 packets/entry
IPsec: Initialized Security Association Processing.
ad0: 6194MB <TOSHIBA MK6412MAT> [13424/15/63] at ata0-master UDMA33
Mounting root from ufs:/dev/ad0s2a
pccard: card inserted, slot 0
pcic0: Event mask 0x9
wi0 at port 0x240-0x27f irq 9 slot 0 on pccard0
wi0: Ethernet address: 00:02:2d:02:98:7e
wi0: promiscuous mode enabled
wi0: promiscuous mode disabled

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