Hello,
I'm running a diskless Soekris net4526 (i386 architecture) and I have
encountered a problem when using dhcp setting on my hostname.sis0 file.
The booting process stops at 'Starting network'.

If I set the interface's hostname.sis0 to static IP, everything works
OK.

If I bring up the interface statically and _then_ run netstart, it also
hangs as it does in the boot process.
air# echo "dhcp" >/etc/hostname.sis0
air# /etc/netstart -n sis0
ifconfig sis0  down;dhclient sis0
air# /etc/netstart sis0
At this point the machine stops responding and must be hard-reset. ^C
doesn't do anything.

If I replicate the steps /etc/netstart takes and run ifconfig and
dhclient separately, it appears as the problem resides in dhclient, as
it straight up freezes and doesn't respond to ^C:
air# ifconfig sis0 down
air# dhclient -v sis0

However, if I set my IP configuration statically to somewhere in my
subnet and then run dhclient, everything works as it should:
air# ifconfig sis0
sis0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:00:24:c4:56:20
        index 2 priority 0 llprio 3
        groups: netboot
        media: Ethernet autoselect (100baseTX full-duplex)
        status: active
        inet 192.168.16.11 netmask 0xffffff00 broadcast 192.168.16.255
air# dhclient -v sis0
sis0: DHCPDISCOVER - interval 1
sis0: DHCPOFFER from 192.168.16.1 (00:22:4d:a6:12:6f)
sis0: DHCPREQUEST to 255.255.255.255
sis0: DHCPACK from 192.168.16.1 (00:22:4d:a6:12:6f)
sis0: bound to 192.168.16.11 from 192.168.16.1 (00:22:4d:a6:12:6f)
air#

My dmesg output:
   OpenBSD 6.3 (GENERIC) #490: Sat Mar 24 14:31:33 MDT 2018
       dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
   cpu0: AMD Am486DX4 W/B or Am5x86 W/B 150 ("AuthenticAMD" 486-class)
   cpu0: FPU
   real mem  = 66600960 (63MB)
   avail mem = 51486720 (49MB)
   warning: no entropy supplied by boot loader
   mpath0 at root
   scsibus0 at mpath0: 256 targets
   mainbus0 at root
   bios0 at mainbus0: date 20/80/03, BIOS32 rev. 0 @ 0xf7840
   pcibios0 at bios0: rev 2.0 @ 0xf0000/0x10000
   pcibios0: pcibios_get_intr_routing - function not supported
   pcibios0: PCI IRQ Routing information unavailable.
   pcibios0: PCI bus #0 is the last bus
   bios0: ROM list: 0xc8000/0x9000
   cpu0 at mainbus0: (uniprocessor)
   pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
   elansc0 at pci0 dev 0 function 0 "AMD ElanSC520 PCI" rev 0x00:
   product 0 stepping 1.1, CPU clock 133MHz, reset 0
   gpio0 at elansc0: 32 pins
   ath0 at pci0 dev 17 function 0 "Atheros AR5212" rev 0x01: irq 10
   ath0: AR5414 10.5 phy 6.1 rf2414 6.3 eeprom 5.2, FCC2A*, address
   00:0c:42:1b:f6:0e
   sis0 at pci0 dev 18 function 0 "NS DP83815 10/100" rev 0x00,
   DP83816A: irq 11, address 00:00:24:c4:56:20
   nsphyter0 at sis0 phy 0: DP83815 10/100 PHY, rev. 1
   isa0 at mainbus0
   isadma0 at isa0
   com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
   com0: console
   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
   wdc1 at isa0 port 0x170/8 irq 15
   wd0 at wdc1 channel 0 drive 0: <064MB ATA Flash Disk>
   wd0: 1-sector PIO, LBA, 61MB, 125056 sectors
   wd0(wdc1:0:0): using BIOS timings
   pcppi0 at isa0 port 0x61
   spkr0 at pcppi0
   npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
   vscsi0 at root
   scsibus1 at vscsi0: 256 targets
   softraid0 at root
   scsibus2 at softraid0: 256 targets
   PXE boot MAC address 00:00:24:c4:56:20, interface sis0
   nfs_boot: using interface sis0, with revarp & bootparams
   nfs_boot: client_addr=192.168.16.11
   nfs_boot: server_addr=192.168.16.1 hostname=air
   root on 192.168.16.1:/var/exports/air
   nfs_boot: bootparam get swap: 60
   WARNING: no swap

Is there something I am missing?

-- 
Thanks in advance
Kristjan Komlosi

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