I did these: - edit /etcsysctl.conf so that ddb.console=1 - rebooted - in another shell ran $ tcpdump -s1500 -Xvvi re0 icmp6 ('<interface> proto icmp6' gave 'Syntax Error')
- did ctrl-alt-esc, got Stopped at Debugger... ddb>w nd6_debug 1 nd6_debug 0 = 1 ddb>c - ran $ rtsol -D re0 - and got: checking if re0 is ready... re0 is ready set timer for re0 to 0:481765 New timer is 0:00481718 timer expiration on re0, state = 1 send RS on re0, whose state is 2 set timer for re0 to 4:0 New timer is 4:00000163 received RA from fe80::21f:f3ff:fe40:ac51 on re0, state is 2 stop timer for re0 there is no timer - in the other tcpdump shell saw this: tcpdump: listening on re0, link-type EN10MB 15:13:53.750950 fe80::230:48ff:fedc:75df > ff02::2: icmp6: router solicitation\ (src lladdr: 00:30:48:dc:75:df) (len 16, hlim 255) 0000: 6000 0000 0010 3aff fe80 0000 0000 0000 `.....:??....... 0010: 0230 48ff fedc 75df ff02 0000 0000 0000 .0H???u??....... 0020: 0000 0000 0000 0002 8500 fd56 0000 0000 ..........?V.... 0030: 0101 0030 48dc 75df ...0H?u? 15:13:54.140179 fe80::21f:f3ff:fe40:ac51 > ff02::1: icmp6: router advertisement\ (chlim=64, O router_ltime=1800, reachable_time=0, retrans_time=0)(src lladdr:\ 00:1f:f3:40:ac:51)(prefix info: LA valid_ltime=14400, preferred_ltime=3600,\ prefix=2001:470:1f07:15cc::/64)(unknown opt_type=25, opt_len=3) (len 80, hlim\ 255) 0000: 6000 0000 0050 3aff fe80 0000 0000 0000 `....P:??....... 0010: 021f f3ff fe40 ac51 ff02 0000 0000 0000 ..???@?Q?....... 0020: 0000 0000 0000 0001 8600 f841 4040 0708 ..........?A@@.. 0030: 0000 0000 0000 0000 0101 001f f340 ac51 ............?@?Q 0040: 0304 40c0 0000 3840 0000 0e10 0000 0000 ..@?..8@........ 0050: 2001 0470 1f07 15cc 0000 0000 0000 0000 ..p...?........ 0060: 1903 0000 0000 04b0 2001 0470 1f07 15cc .......? ..p...? 0070: 021f f3ff fe40 ac51 ..???@?Q - ran dmesg and got this: OpenBSD 5.0 (GENERIC.MP) #59: Wed Aug 17 10:19:44 MDT 2011 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP cpu0: Intel(R) Atom(TM) CPU 230 @ 1.60GHz ("GenuineIntel" 686-class) 1.61 GHz cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,\ DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,TM2,SSSE3,CX16,xTPR,\ PDCM,MOVBE real mem = 2138238976 (2039MB) avail mem = 2093182976 (1996MB) mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 07/10/09, BIOS32 rev. 0 @ 0xf0010, SMBIOS\ rev. 2.5 @ 0xfd170 (27 entries) bios0: vendor American Megatrends Inc. version "1.0a" date 07/10/2009 bios0: Supermicro X7SLA acpi0 at bios0: rev 2 acpi0: sleep states S0 S1 S3 S4 S5 acpi0: tables DSDT FACP APIC MCFG SLIC OEMB acpi0: wakeup devices P0P2(S4) P0P1(S4) PS2K(S4) PS2M(S4) EUSB(S4) MC97(S4)\ P0P4(S4) P0P5(S4) P0P6(S4) P0P7(S4) P0P8(S4) LAN0(S1) P0P9(S4) LAN1(S1)\ USB0(S4) USB1(S4) USB2(S4) USB3(S4) SLPB(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: apic clock running at 133MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Atom(TM) CPU 230 @ 1.60GHz ("GenuineIntel" 686-class) 1.61 GHz cpu1: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,\ DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,TM2,SSSE3,CX16,xTPR,\ PDCM,MOVBE ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins ioapic0: misconfigured as apic 1, remapped to apid 2 acpimcfg0 at acpi0 addr 0xf0000000, bus 0-63 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (P0P2) acpiprt2 at acpi0: bus 3 (P0P1) acpiprt3 at acpi0: bus 1 (P0P4) acpiprt4 at acpi0: bus -1 (P0P5) acpiprt5 at acpi0: bus -1 (P0P6) acpiprt6 at acpi0: bus -1 (P0P7) acpiprt7 at acpi0: bus 2 (P0P8) acpiprt8 at acpi0: bus -1 (P0P9) acpicpu0 at acpi0 acpicpu1 at acpi0 acpibtn0 at acpi0: SLPB acpibtn1 at acpi0: PWRB bios0: ROM list: 0xc0000/0xaa00! pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "Intel 82945G Host" rev 0x02 vga1 at pci0 dev 2 function 0 "Intel 82945G Video" rev 0x02 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) intagp0 at vga1 agp0 at intagp0: aperture at 0xe0000000, size 0x10000000 inteldrm0 at vga1: apic 2 int 16 drm0 at inteldrm0 ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x01: apic 2 int 16 pci1 at ppb0 bus 1 ppb1 at pci0 dev 28 function 4 "Intel 82801G PCIE" rev 0x01: apic 2 int 16 pci2 at ppb1 bus 2 re0 at pci2 dev 0 function 0 "Realtek 8168" rev 0x02: RTL8168C/8111C (0x3c00),\ apic 2 int 16, address 00:30:48:dc:75:df rgephy0 at re0 phy 7: RTL8169S/8110S PHY, rev. 2 uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: apic 2 int 23 uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: apic 2 int 19 uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x01: apic 2 int 18 uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x01: apic 2 int 16 ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: apic 2 int 23 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb2 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xe1 pci3 at ppb2 bus 3 ichpcib0 at pci0 dev 31 function 0 "Intel 82801GB LPC" rev 0x01: PM disabled pciide0 at pci0 dev 31 function 1 "Intel 82801GB IDE" rev 0x01: DMA, channel 0\ configured to compatibility, channel 1 configured to compatibility pciide0: channel 0 disabled (no drives) pciide0: channel 1 disabled (no drives) pciide1 at pci0 dev 31 function 2 "Intel 82801GB SATA" rev 0x01: DMA, channel 0\ configured to native-PCI, channel 1 configured to native-PCI pciide1: using apic 2 int 19 for native-PCI interrupt wd0 at pciide1 channel 0 drive 0: <WDC WD3200BEKT-00F3T0> wd0: 16-sector PIO, LBA48, 305245MB, 625142448 sectors wd0(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 6 ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: apic 2 int 19 iic0 at ichiic0 lm1 at iic0 addr 0x2d: W83627DHG spdmem0 at iic0 addr 0x50: 1GB DDR2 SDRAM non-parity PC2-4200CL3 spdmem1 at iic0 addr 0x52: 1GB DDR2 SDRAM non-parity PC2-4200CL3 usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1 isa0 at ichpcib0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard, using wsdisplay0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 wbsio0 at isa0 port 0x2e/2: W83627DHG-P rev 0x73 lm2 at wbsio0 port 0x290/8: W83627DHG npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 mtrr: Pentium Pro MTRR support lm1: disabling sensors vscsi0 at root scsibus0 at vscsi0: 256 targets softraid0 at root scsibus1 at softraid0: 256 targets root on wd0a (7e7e20c9e520161b.a) swap on wd0b dump on wd0b Stopped at Debugger+0x4: popl %ebp ddb{0}> Stopped at Debugger+0x4: popl %ebp ddb{0}> nd6_debug 0 = 1 ddb{0}> <7>nd6_options: unsupported option 25 - option ignored nd6_options: unsupported option 25 - option ignored The 'unsupported option 25' looks to my untrained eye as the culprit. Does that help you?