Hi,
I recently switched to another ISP, and it uses PPPoE so I set things
up using pppoe(4). This works fine about 50% of the time: after a
reboot of the OpenBSD box there's a ~50% chance that the link comes up
correctly. The strange thing is that IPv4 connectivity does *not* work
in that case, while IPv6 connectivity (via dhcp6leased) *does* work. A
tcpdump of IPv4 traffic on pppoe0 shows only outbound packets (TCP
SYNs, UDP, etc), nothing coming back in.
The PPPoE connection is from an Ethernet interface on my machine
(igc1) directly to the ONT of the ISP. The ONT expects the PPPoE
session on VLAN 6. The ISP has assigned a static IPv4 address.
I suspect some sort of race condition occurring somewhere, but I
wouldn't know where to start digging. What would be the best way of
debugging this?
The hostname.if files:
calvin# cat /etc/hostname.igc1
media 2500baseT mtu 1508 up
calvin# cat /etc/hostname.vlan6
vnetid 6 parent igc1 mtu 1508 up
calvin# cat /etc/hostname.pppoe0
inet 45.142.146.140 255.255.255.255 NONE \
pppoedev vlan6 authproto pap \
authname '[email protected]' authkey '1234' \
mtu 1500 up
dest 0.0.0.1
inet6 autoconf eui64
!/sbin/route add default -ifp pppoe0 0.0.0.1
!/sbin/route add -inet6 default -ifp pppoe0 fe80::%pppoe0
When the link *does not* initialize correctly, the output of "ifconfig
pppoe0" is as follows (note the IPv6 address but the lack of IPv4 DNS
addresses and the 0.0.0.0):
pppoe0:
flags=248851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST,AUTOCONF6TEMP,AUTOCONF6>
mtu 1500
index 5 priority 0 llprio 3
dev: vlan6 state: session
sid: 0x846 PADI retries: 2 PADR retries: 0 time: 00:01:05
sppp: phase network authproto pap authname "[email protected]"
groups: pppoe egress
status: active
inet6 fe80::82ee:73ff:fefd:879f%pppoe0 --> prefixlen 64 scopeid 0x5
inet 45.142.146.140 --> 0.0.0.0 netmask 0xffffffff
inet6 2a10:3781:5c30::1 --> prefixlen 128 pltime 86339 vltime 86339
The first part of the routing table shows:
calvin# route -n show -inet
Routing tables
Internet:
Destination Gateway Flags Refs Use Mtu Prio Iface
default 0.0.0.0 UGS 26 2710 - 8 pppoe0
224/4 127.0.0.1 URS 0 84 32768 8 lo0
0.0.0.0 45.142.146.140 UHh 1 1 - 8 pppoe0
10.0.0/24 10.0.0.253 UCn 7 3 - 4 vport3
[...]
When the link initializes correctly, "ifconfig pppoe0" shows (note a
gateway IPv4 address now shows, as well as two IPv4 DNS addresses):
pppoe0:
flags=248851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST,AUTOCONF6TEMP,AUTOCONF6>
mtu 1500
index 5 priority 0 llprio 3
dev: vlan6 state: session
sid: 0x133d PADI retries: 2 PADR retries: 0 time: 00:00:29
sppp: phase network authproto pap authname "[email protected]"
dns: 185.93.175.43 185.232.98.76
groups: pppoe egress
status: active
inet6 fe80::82ee:73ff:fefd:879f%pppoe0 --> prefixlen 64 scopeid 0x5
inet 45.142.146.140 --> 185.93.175.251 netmask 0xffffffff
inet6 2a10:3781:5c30::1 --> prefixlen 128 pltime 86374 vltime 86374
The first part of the routing table:
calvin$ route -n show -inet
Routing tables
Internet:
Destination Gateway Flags Refs Use Mtu Prio Iface
default 185.93.175.251 UGS 11 6768 - 8 pppoe0
224/4 127.0.0.1 URS 0 249 32768 8 lo0
10.0.0/24 10.0.0.253 UCn 7 0 - 4 vport3
10.0.0.13 e8:db:84:d0:7a:22 UHLc 0 41 - 3 vport3
[...]
Any pointers would be greatly appreciated!
OpenBSD 7.9 (GENERIC.MP) #449: Wed May 6 13:17:25 MDT 2026
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 16959537152 (16173MB)
avail mem = 16417820672 (15657MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 3.6 @ 0x77c8a000 (76 entries)
bios0: vendor American Megatrends International, LLC. version "1.03"
date 03/27/2025
bios0: Shuttle Inc. DH770
efi0 at bios0: UEFI 2.8
efi0: American Megatrends rev 0x5001b
acpi0 at bios0: ACPI 6.5
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP FIDT SSDT SSDT SSDT SSDT HPET APIC MCFG SSDT
UEFI NHLT LPIT SSDT SSDT DBGP DBG2 SSDT DMAR FPDT SSDT SSDT SSDT PHAT
TPM2 WSMT
acpi0: wakeup devices PEG1(S4) PEGP(S4) PEGP(S4) PEG0(S4) PEGP(S4)
SIO1(S3) RP09(S4) PXSX(S4) RP10(S4) PXSX(S4) RP11(S4) PXSX(S4)
RP12(S4) PXSX(S4) RP13(S4) PXSX(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 19200000 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i3-14100, 4689.99 MHz, 06-bf-05, patch 0000003e
cpu0: cpuid 1
edx=bfebfbff<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>
ecx=77fafbbf<SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND>
cpu0: cpuid 6 eax=df8ff7<SENSOR,ARAT,PTS> ecx=409<EFFFREQ>
cpu0: cpuid 7.0
ebx=239c27eb<FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,CLFLUSHOPT,CLWB,PT,SHA>
ecx=98c007ac<UMIP,PKU,WAITPKG,PKS>
edx=fc184410<MD_CLEAR,IBT,IBRS,IBPB,STIBP,L1DF,SSBD>
cpu0: cpuid a vers=5, gp=8, gpwidth=48, ff=4, ffwidth=48
cpu0: cpuid d.1 eax=f<XSAVEOPT,XSAVEC,XGETBV1,XSAVES>
cpu0: cpuid 80000001 edx=2c100800<NXE,PAGE1GB,RDTSCP,LONG>
ecx=121<LAHF,ABM,3DNOWP>
cpu0: cpuid 80000007 edx=100<ITSC>
cpu0: msr
10a=cc8fd6b<IBRS_ALL,SKIP_L1DFL,MDS_NO,IF_PSCHANGE,TAA_NO,MISC_PKG_CT,ENERGY_FILT,DOITM,SBDR_SSDP_N,FBSDP_NO,PSDP_NO,RRSBA,OVERCLOCK,GDS_NO,RFDS_NO>
cpu0: 48KB 64b/line 12-way D-cache, 32KB 64b/line 8-way I-cache, 1MB
64b/line 10-way L2 cache, 12MB 64b/line 12-way L3 cache
cpu0: smt 0, core 0, package 0, type P
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 38MHz
cpu0: mwait min=64, max=64, C-substates=0.2.0.1.0.1.0.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Core(TM) i3-14100, 4687.98 MHz, 06-bf-05, patch 0000003e
cpu1: smt 0, core 1, package 0, type P
cpu2 at mainbus0: apid 4 (application processor)
cpu2: Intel(R) Core(TM) i3-14100, 4490.24 MHz, 06-bf-05, patch 0000003e
cpu2: smt 0, core 2, package 0, type P
cpu3 at mainbus0: apid 6 (application processor)
cpu3: Intel(R) Core(TM) i3-14100, 4490.27 MHz, 06-bf-05, patch 0000003e
cpu3: smt 0, core 3, package 0, type P
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 120 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xc0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PC00)
acpiprt1 at acpi0: bus -1 (PEG1)
acpiprt2 at acpi0: bus -1 (PEG0)
acpiprt3 at acpi0: bus -1 (RP09)
acpiprt4 at acpi0: bus -1 (RP10)
acpiprt5 at acpi0: bus -1 (RP11)
acpiprt6 at acpi0: bus -1 (RP12)
acpiprt7 at acpi0: bus -1 (RP13)
acpiprt8 at acpi0: bus -1 (RP14)
acpiprt9 at acpi0: bus -1 (RP15)
acpiprt10 at acpi0: bus -1 (RP16)
acpiprt11 at acpi0: bus -1 (RP01)
acpiprt12 at acpi0: bus -1 (RP02)
acpiprt13 at acpi0: bus -1 (RP03)
acpiprt14 at acpi0: bus -1 (RP04)
acpiprt15 at acpi0: bus -1 (RP05)
acpiprt16 at acpi0: bus 1 (RP06)
acpiprt17 at acpi0: bus 2 (RP07)
acpiprt18 at acpi0: bus -1 (RP08)
acpiprt19 at acpi0: bus -1 (RP17)
acpiprt20 at acpi0: bus -1 (RP18)
acpiprt21 at acpi0: bus -1 (RP19)
acpiprt22 at acpi0: bus -1 (RP20)
acpiprt23 at acpi0: bus -1 (RP21)
acpiprt24 at acpi0: bus -1 (RP22)
acpiprt25 at acpi0: bus -1 (RP23)
acpiprt26 at acpi0: bus -1 (RP24)
acpiprt27 at acpi0: bus -1 (RP25)
acpiprt28 at acpi0: bus -1 (RP26)
acpiprt29 at acpi0: bus -1 (RP27)
acpiprt30 at acpi0: bus -1 (RP28)
acpiec0 at acpi0: not present
acpiec1 at acpi0
acpipci0 at acpi0 PC00: 0x00000000 0x00000011 0x00000001
com0 at acpi0 UAR1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
com0: console
com1 at acpi0 UAR2 addr 0x2f8/0x8 irq 3: ns16550a, 16 byte fifo
"ACPI000E" at acpi0 not configured
pchgpio0 at acpi0 GPI0 addr 0xe06e0000/0x10000 0xe06d0000/0x10000
0xe06b0000/0x10000 0xe06a0000/0x10000 0xe0690000/0x10000 irq 14, 480
pins
acpibtn0 at acpi0: SLPB
acpicpu0 at acpi0: C3(200@1048 mwait.1@0x60), C2(350@127
mwait.1@0x20), C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C3(200@1048 mwait.1@0x60), C2(350@127
mwait.1@0x20), C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C3(200@1048 mwait.1@0x60), C2(350@127
mwait.1@0x20), C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C3(200@1048 mwait.1@0x60), C2(350@127
mwait.1@0x20), C1(1000@1 mwait.1), PSS
"PNP0C14" at acpi0 not configured
"PNP0C14" at acpi0 not configured
intelpmc0 at acpi0: PEPD
state 0: 0x7f:1:2:0x00:0x0000000000000060
counter: 0x7f:64:0:0x00:0x0000000000000632
frequency: 0
state 1: 0x7f:1:2:0x00:0x0000000000000060
counter: 0x00:32:0:0x03:0x00000000fe001098
frequency: 32768
acpibtn1 at acpi0: PWRB
tpm0 at acpi0 TPM_ 2.0 (CRB) addr 0xfed40000/0x5000, device 0x00000000 rev 0x0
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
acpipwrres0 at acpi0: WRST
acpipwrres1 at acpi0: FN00, resource for FAN0
acpipwrres2 at acpi0: FN01, resource for FAN1
acpipwrres3 at acpi0: FN02, resource for FAN2
acpipwrres4 at acpi0: FN03, resource for FAN3
acpipwrres5 at acpi0: FN04, resource for FAN4
acpitz0 at acpi0
acpitz0: critical temperature is 105 degC
acpipwrres6 at acpi0: PIN_
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD1F
acpivout1 at acpivideo0: DD2F
cpu0: Enhanced SpeedStep 4689 MHz: speeds: 3501, 3500, 3300, 3100,
2900, 2700, 2500, 2300, 2100, 2000, 1800, 1600, 1400, 1200, 1000, 800
MHz
pci0 at mainbus0 bus 0
0:31:5: mem address conflict 0xfe010000/0x1000
pchb0 at pci0 dev 0 function 0 "Intel Core 12G Host" rev 0x05
inteldrm0 at pci0 dev 2 function 0 "Intel UHD Graphics 730" rev 0x0c
drm0 at inteldrm0
inteldrm0: msi, ALDERLAKE_S, gen 12
xhci0 at pci0 dev 20 function 0 "Intel 700 Series xHCI" rev 0x11: msi, xHCI 1.20
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev
3.00/1.00 addr 1
"Intel 700 Series Shared SRAM" rev 0x11 at pci0 dev 20 function 2 not configured
"Intel 700 Series HECI" rev 0x11 at pci0 dev 22 function 0 not configured
ahci0 at pci0 dev 23 function 0 "Intel 700 Series AHCI" rev 0x11: msi,
AHCI 1.3.1
ahci0: port 4: 6.0Gb/s
ahci0: PHY offline on port 5
ahci0: PHY offline on port 6
ahci0: PHY offline on port 7
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 4 lun 0: <ATA, SAMSUNG MZ7KH240, HXM7> naa.5002538e02207c90
sd0: 228936MB, 512 bytes/sector, 468862128 sectors, thin
ppb0 at pci0 dev 28 function 0 "Intel 700 Series PCIE" rev 0x11: msi
pci1 at ppb0 bus 1
igc0 at pci1 dev 0 function 0 "Intel I226-LM" rev 0x04, msix, 4
queues, address 80:ee:73:fd:87:9f
ppb1 at pci0 dev 28 function 6 "Intel 700 Series PCIE" rev 0x11: msi
pci2 at ppb1 bus 2
igc1 at pci2 dev 0 function 0 "Intel I226-LM" rev 0x04, msix, 4
queues, address 80:ee:73:fd:87:a0
pcib0 at pci0 dev 31 function 0 "Intel H770 eSPI" rev 0x11
azalia0 at pci0 dev 31 function 3 "Intel 700 Series HD Audio" rev 0x11: msi
azalia0: codecs: Realtek ALC888, Intel/0x2815, using Realtek ALC888
audio0 at azalia0
ichiic0 at pci0 dev 31 function 4 "Intel 700 Series SMBus" rev 0x11:
apic 2 int 18
iic0 at ichiic0
iic0: addr 0x48 0a=02 15=2c 16=20 19=04 1b=05 1c=60 1e=60 1f=60 20=cf
21=78 22=63 25=78 26=63 27=78 28=63 29=80 2a=88 2b=42 2c=20 2d=22
2e=b4 2f=5e 32=80 33=04 34=0e 3b=12 3c=8a 3d=8c words 00=0000 01=0000
02=0000 03=0000 04=0000 05=0000 06=0000 07=0000
"Intel 700 Series SPI" rev 0x11 at pci0 dev 31 function 5 not configured
isa0 at pcib0
isadma0 at isa0
kbc selftest: ffffffff
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT
efifb at mainbus0 not configured
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (b833f3cf9322063e.a) swap on sd0b dump on sd0b
inteldrm0: 1024x768, 32bpp
wsdisplay0 at inteldrm0 mux 1
wsdisplay0: screen 0-5 added (std, vt100 emulation)
