Hello,

I am using svlan(4) and when I add a new svlan(4) interface after the system has
booted I always get a duplicated IPv6 and the new interface is not usable. If I
add a /etc/hostname.svlan file and I reboot, everything is fine.
Any idea why ?

Thanks,
Denis

Example (after boot) :
# ifconfig
[...]
svlan1001: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:15:17:c1:71:fc
        priority: 0
        vlan: 1001 parent interface: em0
        groups: svlan
        status: active
        inet 100.67.233.1 netmask 0xfffffffc broadcast 100.67.233.3
        inet6 fe80::215:17ff:fec1:71fc%svlan1001 prefixlen 64 scopeid 0x9
        inet6 2001:db8:ffff::1001:ff01 prefixlen 126
svlan1002: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:15:17:c1:71:fc
        priority: 0
        vlan: 1002 parent interface: em0
        groups: svlan
        status: active
        inet 100.67.234.1 netmask 0xfffffffc broadcast 100.67.234.3
        inet6 fe80::215:17ff:fec1:71fc%svlan1002 prefixlen 64 scopeid 0xa
        inet6 2001:db8:ffff::1002:ff01 prefixlen 126
svlan1003: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:15:17:c1:71:fc
        priority: 0
        vlan: 1003 parent interface: em0
        groups: svlan
        status: active
        inet 100.67.235.1 netmask 0xfffffffc broadcast 100.67.235.3
        inet6 fe80::215:17ff:fec1:71fc%svlan1003 prefixlen 64 scopeid 0xb
        inet6 2001:db8:ffff::1003:ff01 prefixlen 126
[...]
# ifconfig svlan1000 vlandev em0
# ifconfig svlan1000 inet6 2001:db8:ffff::1000:ff01/126 
# ifconfig
[...]
svlan1000: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:15:17:c1:71:fc
        priority: 0
        vlan: 1000 parent interface: em0
        groups: svlan
        status: active
        inet 100.67.230.1 netmask 0xfffffffc broadcast 100.67.230.3
        inet6 fe80::215:17ff:fec1:71fc%svlan1000 prefixlen 64 duplicated scopeid
0xf
        inet6 2001:db8:ffff::1000:ff01 prefixlen 126 duplicated
[...]

# uname -a 
OpenBSD rt-net 5.9 GENERIC.MP#1783 amd64

OpenBSD 5.9-beta (GENERIC.MP) #1783: Sun Dec 27 17:08:42 MST 2015
     dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
 RTC BIOS diagnostic error 9<fixed_disk>
 real mem = 8565923840 (8169MB)
 avail mem = 8302190592 (7917MB)
 mpath0 at root
 scsibus0 at mpath0: 256 targets
 mainbus0 at root
 bios0 at mainbus0: SMBIOS rev. 2.5 @ 0x9fa32000 (67 entries)
 bios0: vendor Intel Corporation version "S5000.86B.15.00.0101.110920101604"
date 11/09/2010
 bios0: Rackable Systems Inc. S5000PSL
 acpi0 at bios0: rev 2
 acpi0: sleep states S0 S1 S4 S5
 acpi0: tables DSDT FACP APIC SPCR HPET MCFG SSDT SSDT SSDT HEST BERT ERST EINJ
 acpi0: wakeup devices SLPB(S5) PEX0(S5) PS2M(S1) PS2K(S1) UAR1(S5) UAR2(S5)
UHC1(S1) UHC2(S1) UHC3(S1) UHC4(S1) EHCI(S1) PCIX(S5) PCIO(S5) PCIP(S5) PCIQ(S5)
PCIF(S5) [...]
 acpitimer0 at acpi0: 3579545 Hz, 24 bits
 acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
 cpu0 at mainbus0: apid 0 (boot processor)
 cpu0: Intel(R) Xeon(R) CPU L5420 @ 2.50GHz, 2494.11 MHz
 cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF,SENSOR
 cpu0: 6MB 64b/line 16-way L2 cache
 cpu0: smt 0, core 0, package 0
 mtrr: Pentium Pro MTRR support, 7 var ranges, 88 fixed ranges
 cpu0: apic clock running at 332MHz
 cpu0: mwait min=64, max=64, C-substates=0.2.2.2, IBE
 cpu1 at mainbus0: apid 2 (application processor)
 cpu1: Intel(R) Xeon(R) CPU L5420 @ 2.50GHz, 2493.76 MHz
 cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF,SENSOR
 cpu1: 6MB 64b/line 16-way L2 cache
 cpu1: smt 0, core 2, package 0
 cpu2 at mainbus0: apid 1 (application processor)
 cpu2: Intel(R) Xeon(R) CPU L5420 @ 2.50GHz, 2493.76 MHz
 cpu2:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF,SENSOR
 cpu2: 6MB 64b/line 16-way L2 cache
 cpu2: smt 0, core 1, package 0
 cpu3 at mainbus0: apid 3 (application processor)
 cpu3: Intel(R) Xeon(R) CPU L5420 @ 2.50GHz, 2493.76 MHz
 cpu3:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF,SENSOR
 cpu3: 6MB 64b/line 16-way L2 cache
 cpu3: smt 0, core 3, package 0
 ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 24 pins
 ioapic1 at mainbus0: apid 9 pa 0xfec80000, version 20, 24 pins
 acpihpet0 at acpi0: 14318179 Hz
 acpimcfg0 at acpi0 addr 0xa0000000, bus 0-255
 acpiprt0 at acpi0: bus 0 (PCI0)
 acpiprt1 at acpi0: bus 12 (PC32)
 acpiprt2 at acpi0: bus 11 (PEX0)
 acpiprt3 at acpi0: bus -1 (PEX1)
 acpiprt4 at acpi0: bus -1 (PEX2)
 acpiprt5 at acpi0: bus -1 (PEX3)
 acpiprt6 at acpi0: bus 1 (PCIE)
 acpiprt7 at acpi0: bus 5 (PCIX)
 acpiprt8 at acpi0: bus 2 (PCIW)
 acpiprt9 at acpi0: bus 3 (PCIO)
 acpiprt10 at acpi0: bus -1 (PCIP)
 acpiprt11 at acpi0: bus 4 (PCIQ)
 acpiprt12 at acpi0: bus 7 (PCIF)
 acpiprt13 at acpi0: bus 8 (PCIG)
 acpiprt14 at acpi0: bus 9 (PCIH)
 acpicpu0 at acpi0: !C2(750@40 io@0x162), C1(1000@20 halt), PSS
 acpicpu1 at acpi0: !C2(750@40 io@0x162), C1(1000@20 halt), PSS
 acpicpu2 at acpi0: !C2(750@40 io@0x162), C1(1000@20 halt), PSS
 acpicpu3 at acpi0: !C2(750@40 io@0x162), C1(1000@20 halt), PSS
 acpibtn0 at acpi0: SLPB
 acpibtn1 at acpi0: PWRB
 ipmi at mainbus0 not configured
 cpu0: Enhanced SpeedStep 2494 MHz: speeds: 2497, 1998 MHz
 pci0 at mainbus0 bus 0
 pchb0 at pci0 dev 0 function 0 "Intel 5000P Host" rev 0xb1
 ppb0 at pci0 dev 2 function 0 "Intel 5000 PCIE x8" rev 0xb1
 pci1 at ppb0 bus 1
 ppb1 at pci1 dev 0 function 0 "Intel 6321ESB PCIE" rev 0x01
 pci2 at ppb1 bus 2
 ppb2 at pci2 dev 0 function 0 "Intel 6321ESB PCIE" rev 0x01
 pci3 at ppb2 bus 3
 ppb3 at pci2 dev 2 function 0 "Intel 6321ESB PCIE" rev 0x01
 pci4 at ppb3 bus 4
 em0 at pci4 dev 0 function 0 "Intel 80003ES2" rev 0x01: msi, address
00:15:17:c1:71:fc
 em1 at pci4 dev 0 function 1 "Intel 80003ES2" rev 0x01: msi, address
00:15:17:c1:71:fd
 ppb4 at pci1 dev 0 function 3 "Intel 6321ESB PCIE-PCIX" rev 0x01
 pci5 at ppb4 bus 5
 ppb5 at pci0 dev 3 function 0 "Intel 5000 PCIE" rev 0xb1
 pci6 at ppb5 bus 6
 ppb6 at pci0 dev 4 function 0 "Intel 5000 PCIE x8" rev 0xb1: msi
 pci7 at ppb6 bus 7
 em2 at pci7 dev 0 function 0 "Intel I350 Fiber" rev 0x01: msi, address
6c:b3:11:41:07:e4
 em3 at pci7 dev 0 function 1 "Intel I350 Fiber" rev 0x01: msi, address
6c:b3:11:41:07:e5
 em4 at pci7 dev 0 function 2 "Intel I350 Fiber" rev 0x01: msi, address
6c:b3:11:41:07:e6
 em5 at pci7 dev 0 function 3 "Intel I350 Fiber" rev 0x01: msi, address
6c:b3:11:41:07:e7
 ppb7 at pci0 dev 5 function 0 "Intel 5000 PCIE" rev 0xb1
 pci8 at ppb7 bus 8
 ppb8 at pci0 dev 6 function 0 "Intel 5000 PCIE x8" rev 0xb1: msi
 pci9 at ppb8 bus 9
 ppb9 at pci0 dev 7 function 0 "Intel 5000 PCIE" rev 0xb1
 pci10 at ppb9 bus 10
 pchb1 at pci0 dev 16 function 0 "Intel 5000 Error Reporting" rev 0xb1
 pchb2 at pci0 dev 16 function 1 "Intel 5000 Error Reporting" rev 0xb1
 pchb3 at pci0 dev 16 function 2 "Intel 5000 Error Reporting" rev 0xb1
 pchb4 at pci0 dev 17 function 0 "Intel 5000 Reserved" rev 0xb1
 pchb5 at pci0 dev 19 function 0 "Intel 5000 Reserved" rev 0xb1
 pchb6 at pci0 dev 21 function 0 "Intel 5000 FBD" rev 0xb1
 pchb7 at pci0 dev 22 function 0 "Intel 5000 FBD" rev 0xb1
 ppb10 at pci0 dev 28 function 0 "Intel 6321ESB PCIE" rev 0x09: msi
 pci11 at ppb10 bus 11
 uhci0 at pci0 dev 29 function 0 "Intel 6321ESB USB" rev 0x09: apic 8 int 23
 uhci1 at pci0 dev 29 function 1 "Intel 6321ESB USB" rev 0x09: apic 8 int 22
 uhci2 at pci0 dev 29 function 2 "Intel 6321ESB USB" rev 0x09: apic 8 int 23
 uhci3 at pci0 dev 29 function 3 "Intel 6321ESB USB" rev 0x09: apic 8 int 22
 ehci0 at pci0 dev 29 function 7 "Intel 6321ESB USB" rev 0x09: apic 8 int 23
 usb0 at ehci0: USB revision 2.0
 uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
 ppb11 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xd9
 pci12 at ppb11 bus 12
 12:12:0: mem address conflict 0xfffe0000/0x20000
 radeondrm0 at pci12 dev 12 function 0 "ATI ES1000" rev 0x02
 drm0 at radeondrm0
 radeondrm0: apic 8 int 17
 pcib0 at pci0 dev 31 function 0 "Intel 6321ESB LPC" rev 0x09
 pciide0 at pci0 dev 31 function 1 "Intel 6321ESB IDE" rev 0x09: DMA, channel 0
configured to compatibility, channel 1 configured to compatibility
 pciide0: channel 0 disabled (no drives)
 pciide0: channel 1 disabled (no drives)
 ahci0 at pci0 dev 31 function 2 "Intel 6321ESB AHCI" rev 0x09: apic 8 int 20,
AHCI 1.1
 ahci0: port 1: 3.0Gb/s
 scsibus1 at ahci0: 32 targets
 sd0 at scsibus1 targ 1 lun 0: <ATA, OCZ-AGILITY3, 2.50> SCSI3 0/direct fixed
naa.5e83a97e3b11f548
 sd0: 114473MB, 512 bytes/sector, 234441648 sectors, thin
 ichiic0 at pci0 dev 31 function 3 "Intel 6321ESB SMBus" rev 0x09: apic 8 int 20
 iic0 at ichiic0
 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 pcib0
 isadma0 at isa0
 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
 com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
 pckbc0 at isa0 port 0x60/5 irq 1 irq 12
 pckbd0 at pckbc0 (kbd slot)
 wskbd0 at pckbd0: console keyboard
 pcppi0 at isa0 port 0x61
 spkr0 at pcppi0
 uhidev0 at uhub2 port 1 configuration 1 interface 0 "vendor 0x0dc6 USB
keyboard" rev 1.10/1.03 addr 2
 uhidev0: iclass 3/1
 ukbd0 at uhidev0: 8 variable keys, 6 key codes
 wskbd1 at ukbd0 mux 1
 uhidev1 at uhub2 port 1 configuration 1 interface 1 "vendor 0x0dc6 USB
keyboard" rev 1.10/1.03 addr 2
 uhidev1: iclass 3/1
 ums0 at uhidev1: 3 buttons, Z dir
 wsmouse0 at ums0 mux 0
 vscsi0 at root
 scsibus2 at vscsi0: 256 targets
 softraid0 at root
 scsibus3 at softraid0: 256 targets
 root on sd0a (0bdea91e0a96c676.a) swap on sd0b dump on sd0b
 radeondrm0: 1280x1024
 wsdisplay0 at radeondrm0 mux 1: console (std, vt100 emulation), using wskbd0
 wskbd1: connecting to wsdisplay0
 wsdisplay0: screen 1-5 added (std, vt100 emulation)

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