> Problem Description Local originating traffic leaves the system on the wrong interface after a more specific route was added. This is problematic for services like dhcrelay and syslogd.
I verified this on iced this on OpenBSD 6.1 but do not know how if was with older versions. The behaviour is still the same with current. > Workaround: Monitor the routing socket and restart affected services when the routing table changes. > How to reproduce: mistral ~# route -n show -inet Routing tables Internet: Destination Gateway Flags Refs Use Mtu Prio Iface default 172.18.35.1 UGS 7 408 - 12 iwm0 224/4 127.0.0.1 URS 0 1898 32768 8 lo0 127/8 127.0.0.1 UGRS 0 0 32768 8 lo0 127.0.0.1 127.0.0.1 UHhl 1 4 32768 1 lo0 172.18.35/24 172.18.35.87 UCn 1 634 - 8 iwm0 172.18.35.1 cc:4e:24:82:88:42 UHLch 1 312 - 7 iwm0 172.18.35.87 5c:e0:c5:1f:ad:c4 UHLl 0 14 - 1 iwm0 172.18.35.255 172.18.35.87 UHb 0 633 - 1 iwm0 172.30.1/24 192.168.250.18 UGS 0 0 - 8 vether0 192.168.250/24 192.168.250.1 UCn 1 0 - 4 vether0 192.168.250.1 fe:e1:ba:d0:05:e2 UHLl 0 5 - 1 vether0 192.168.250.18 fe:e1:bb:d1:a2:b9 UHLch 2 37 - 3 vether0 192.168.250.255 192.168.250.1 UHb 1 105 - 1 vether0 mistral ~# $mistral 130 ~$ nc -u 172.30.1.1 9999 adsfsa --> do not press ^C, keep it open to generate traffic over the same socket after changing routes --> as expected traffic leaves on vether0 16:24:00.676256 rule 0/(match) match out on vether0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 7 mistral ~# route del 172.30.1.0/24 --> now traffic leaves on iwm0. makes sense because of the default route. 16:24:51.078621 rule 0/(match) match out on iwm0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 3 mistral ~# route add 172.30.1.0/24 192.168.250.18 --> traffic still leaves iwm0. expectations: vether0 16:28:09.440038 rule 0/(match) match out on iwm0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 4 > dmesg OpenBSD 6.2-current (GENERIC.MP) #107: Tue Jan 16 21:58:15 CET 2018 r...@mistral.relo.ch:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 8473632768 (8081MB) avail mem = 8209895424 (7829MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xe0000 (84 entries) bios0: vendor Dell Inc. version "A13" date 06/16/2017 bios0: Dell Inc. XPS 13 9343 acpi0 at bios0: rev 2 acpi0: sleep states S0 S3 S4 S5 acpi0: tables DSDT FACP APIC FPDT FIDT MCFG HPET SSDT UEFI SSDT ASF! SSDT SSDT SSDT SSDT PCCT SSDT SSDT SSDT SLIC MSDM DMAR CSRT BGRT acpi0: wakeup devices PEGP(S4) PEG0(S4) PEGP(S4) PEG1(S4) PEGP(S4) PEG2(S4) PXSX(S4) RP01(S4) PXSX(S4) RP02(S4) PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) PXSX(S4) RP05(S4) [...] 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) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.62 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,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,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT cpu0: 256KB 64b/line 8-way L2 cache acpitimer0: recalibrated TSC frequency 2194928041 Hz cpu0: smt 0, core 0, package 0 mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges cpu0: apic clock running at 99MHz cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE cpu1 at mainbus0: apid 2 (application processor) cpu1: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 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,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,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT cpu1: 256KB 64b/line 8-way L2 cache cpu1: smt 0, core 1, package 0 cpu2 at mainbus0: apid 1 (application processor) cpu2: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 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,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,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT cpu2: 256KB 64b/line 8-way L2 cache cpu2: smt 1, core 0, package 0 cpu3 at mainbus0: apid 3 (application processor) cpu3: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 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,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,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT cpu3: 256KB 64b/line 8-way L2 cache cpu3: smt 1, core 1, package 0 ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins acpimadt0: bogus nmi for apid 3 acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63 acpihpet0 at acpi0: 14318179 Hz acpihpet0: recalibrated TSC frequency 2194924370 Hz acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (PEG0) acpiprt2 at acpi0: bus -1 (PEG1) acpiprt3 at acpi0: bus -1 (PEG2) acpiprt4 at acpi0: bus 1 (RP01) acpiprt5 at acpi0: bus -1 (RP02) acpiprt6 at acpi0: bus -1 (RP03) acpiprt7 at acpi0: bus 2 (RP04) acpiprt8 at acpi0: bus -1 (RP05) acpiprt9 at acpi0: bus -1 (RP06) acpiprt10 at acpi0: bus -1 (RP07) acpiprt11 at acpi0: bus -1 (RP08) acpiec0 at acpi0 acpicpu0 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS acpicpu1 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS acpicpu2 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS acpicpu3 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS acpipwrres0 at acpi0: PG00, resource for PEG0 acpipwrres1 at acpi0: PG01, resource for PEG1 acpipwrres2 at acpi0: PG02, resource for PEG2 acpitz0 at acpi0: critical temperature is 107 degC acpipwrres3 at acpi0: FN00, resource for FAN0 acpipwrres4 at acpi0: FN01, resource for FAN1 acpipwrres5 at acpi0: FN02, resource for FAN2 acpipwrres6 at acpi0: FN03, resource for FAN3 acpipwrres7 at acpi0: FN04, resource for FAN4 acpitz1 at acpi0: critical temperature is 105 degC acpitz2 at acpi0: critical temperature is 105 degC "INT3F0D" at acpi0 not configured "INT3403" at acpi0 not configured "INT3403" at acpi0 not configured "INT3403" at acpi0 not configured "INT3403" at acpi0 not configured "DLLK0665" at acpi0 not configured "DLL0665" at acpi0 not configured "INTL9C60" at acpi0 not configured dwiic0 at acpi0: I2C0 addr 0xfe103000/0x1000 irq 7 iic0 at dwiic0 dwiic1 at acpi0: I2C1 addr 0xfe105000/0x1000 irq 7 iic1 at dwiic1 ihidev0 at iic1 addr 0x2c irq 39, vendor 0x6cb product 0x76ad, DLL0665 ihidev0: 14 report ids imt0 at ihidev0: clickpad, 3 contacts wsmouse0 at imt0 mux 0 "INT3402" at acpi0 not configured "PNP0C14" at acpi0 not configured acpibtn0 at acpi0: LID0 acpibtn1 at acpi0: PBTN acpibtn2 at acpi0: SBTN acpiac0 at acpi0: AC unit offline acpibat0 at acpi0: BAT0 model "DELL 0DRRP56" serial 154 type LiP oem "Sanyo" "INT340F" at acpi0 not configured "INT3400" at acpi0 not configured "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 acpivideo0 at acpi0: GFX0 acpivout0 at acpivideo0: LCD_ cpu0: Enhanced SpeedStep 2494 MHz: speeds: 2201, 2200, 2100, 2000, 1800, 1700, 1600, 1500, 1300, 1200, 1100, 1000, 900, 700, 600, 500 MHz pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "Intel Core 5G Host" rev 0x09 inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 5500" rev 0x09 drm0 at inteldrm0 inteldrm0: msi inteldrm0: 1920x1080, 32bpp wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation) wsdisplay0: screen 1-5 added (std, vt100 emulation) azalia0 at pci0 dev 3 function 0 "Intel Core 5G HD Audio" rev 0x09: msi "Intel Core 5G Thermal" rev 0x09 at pci0 dev 4 function 0 not configured xhci0 at pci0 dev 20 function 0 "Intel 9 Series xHCI" rev 0x03: msi 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 9 Series MEI" rev 0x03 at pci0 dev 22 function 0 not configured azalia1 at pci0 dev 27 function 0 "Intel 9 Series HD Audio" rev 0x03: msi azalia1: codecs: Realtek/0x0288 audio0 at azalia1 ppb0 at pci0 dev 28 function 0 "Intel 9 Series PCIE" rev 0xe3: msi pci1 at ppb0 bus 1 rtsx0 at pci1 dev 0 function 0 "Realtek RTS5249 Card Reader" rev 0x01: msi sdmmc0 at rtsx0: 4-bit, dma ppb1 at pci0 dev 28 function 3 "Intel 9 Series PCIE" rev 0xe3: msi pci2 at ppb1 bus 2 iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7265" rev 0x59, msi ehci0 at pci0 dev 29 function 0 "Intel 9 Series USB" rev 0x03: apic 2 int 21 usb1 at ehci0: USB revision 2.0 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 pcib0 at pci0 dev 31 function 0 "Intel 9 Series LPC" rev 0x03 ahci0 at pci0 dev 31 function 2 "Intel 9 Series AHCI" rev 0x03: msi, AHCI 1.3 ahci0: port 3: 6.0Gb/s scsibus1 at ahci0: 32 targets sd0 at scsibus1 targ 3 lun 0: <ATA, LITEON L8H-256V2, F881> SCSI3 0/direct fixed t10.ATA_LITEON_L8H-256V2G-11_M.2_2280_256GB_TW0MGNHV5508556A4111 sd0: 244198MB, 512 bytes/sector, 500118192 sectors, thin ichiic0 at pci0 dev 31 function 3 "Intel 9 Series SMBus" rev 0x03: apic 2 int 18 iic2 at ichiic0 pchtemp0 at pci0 dev 31 function 6 "Intel 9 Series Thermal" rev 0x03 isa0 at pcib0 isadma0 at isa0 pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pckbd0 at pckbc0 (kbd slot) wskbd0 at pckbd0: console keyboard, using wsdisplay0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 vmm0 at mainbus0: VMX/EPT efifb at mainbus0 not configured uvideo0 at uhub0 port 5 configuration 1 interface 0 "CKFEH41F301030003940 Integrated_Webcam_HD" rev 2.01/48.14 addr 2 video0 at uvideo0 uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.03 addr 2 vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed sd1: 143359MB, 512 bytes/sector, 293600752 sectors root on sd1a (ff74af09a40c98e0.a) swap on sd1b dump on sd1b iwm0: hw rev 0x210, fw ver 16.242414.0, address 5c:e0:c5:1f:ad:c4 iwm0: could not add phy context 0 (error 35)