Hi Dmitry,
Have you tried different NICs in QEMU? Could just be an issue with this one.
There's no problems on a real machine, so perhaps this query would be
best directed at QEMU's mailing lists.
HTH
On Sat, Jul 18, 2009 at 3:41 AM, Dmitiry Y. Zotikov<x...@ungrund.org> wrote:
> Hello everyone,
>
> I'm using OpenBSD as a guest system with qemu, and currently I'm unable
> to get network working. As far as I can say, the problem is not in my
> qemu setup, since I've also tried LFS Linux LiveCD as a guest and it
> worked fine (see below).
>
> Host: Debian Linux testing
> Guest: OpenBSD 4.5
> qemu: 0.10.4 w/o kqemu
>
> OpenBSD installs fine, then the following setup is used to run qemu
> (skipping tests and irrelevant stuff):
>
> run-openbsd.sh:
> ------------------------------------------------------------------------
> disk_image="`dirname $0`/obsd1.img"
> boot="c"
> mem="256"
> output="-vnc 192.168.1.1:1"
> ifname=`sudo tunctl -u $USER -b`
> net_nic="nic,vlan=0,model=pcnet,name=obsd1-pcnet0"
> net_mode="tap,vlan=0,ifname=${ifname},script=/etc/qemu-ifup"
>
> qemu -hda $disk_image \
> -boot $boot \
> -m $mem \
> $output \
> -net $net_nic \
> -net $net_mode
> ------------------------------------------------------------------------
>
> /etc/qemu-ifup:
> ------------------------------------------------------------------------
> ADDR='192.168.3.1 netmask 255.255.255.252'
> sudo -p "Password for $0:" /sbin/ifconfig $1 $ADDR
> ------------------------------------------------------------------------
>
> As a result, I get on Linux (host):
>
> $ ip addr show dev tap0
> 35: tap0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UNKNOWN qlen 500
> link/ether 00:ff:3f:3b:dc:6b brd ff:ff:ff:ff:ff:ff
> inet 192.168.3.1/30 brd 192.168.3.3 scope global tap0
> inet6 fe80::2ff:3fff:fe3b:dc6b/64 scope link
> valid_lft forever preferred_lft forever
>
> $ ip route show
> 192.168.3.0/30 dev tap0 proto kernel scope link src 192.168.3.1
> 192.168.0.0/30 dev eth1 proto kernel scope link src 192.168.0.2
> 192.168.255.0/30 via 192.168.1.2 dev eth0
> 192.168.2.0/24 dev wlan0 proto kernel scope link src 192.168.2.1
> 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.1
> default via 192.168.0.1 dev eth1
>
> Okay, now in the freshly installed OpenBSD (guest):
>
> # ifconfig pcn
> pcn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> lladdr 52:54:00:12:34:56
> priority: 0
> groups: egress
> media: Ethernet autoselect (autoselect)
> inet 192.168.3.2 netmask 0xfffffffc broadcast 192.168.3.3
> inet6 fe80::5054:ff:fe12:3456%pcn0 prefixlen 64 scopeid 0x1
>
> # netstat -f inet -rn
> Routing tables
>
> Internet:
> Destination Gateway Flags Refs Use Mtu Prio
Iface
> default 192.168.3.1 UGS 1 1927 - 8
pcn0
> 127/8 127.0.0.1 UGRS 0 0 33204 8 lo0
> 127.0.0.1 127.0.0.1 UH 1 62 33204 4 lo0
> 192.168.3.0/30 link#1 UC 1 0 - 4
pcn0
> 192.168.3.1 link#1 UHLc 1 5 - 4
pcn0
> 224/4 127.0.0.1 URS 0 0 33204 8 lo0
>
> And when I ping host's tap0 from it (default gw)
>
> # ping 192.168.3.1
> PING 192.168.3.1 (192.168.3.1): 56 data bytes
> ping: sendto: Host is down
> ping: wrote 192.168.3.1 64 chars, ret=-1
> ping: sendto: Host is down
> ping: wrote 192.168.3.1 64 chars, ret=-1
> ping: sendto: Host is down
> ping: wrote 192.168.3.1 64 chars, ret=-1
> --- 192.168.3.1 ping statistics ---
> 6 packets transmitted, 0 packets received, 100.0% packet loss
>
> Because
>
> # arp -an
> ? (192.168.3.1) at (incomplete) on pcn0
>
> So I launched tcpdump to see what's wrong (on linux host):
>
> $ sudo tcpdump -i tap0 -s 0 -w obsd1.dump
>
> Booted OpenBSD, made few pings, halted it, then analyzed the dump:
>
> $ tcpdump -t -r obsd1.dump
> reading from file obsd1.dump, link-type EN10MB (Ethernet)
> IP6 fe80::2ff:c6ff:fead:f73e > ip6-allrouters: ICMP6, router solicitation,
length 16
> IP6 fe80::2ff:c6ff:fead:f73e > ff02::16: HBH ICMP6, multicast listener
report v2, 1 group record(s), length 28
> IP6 fe80::2ff:c6ff:fead:f73e > ip6-allrouters: ICMP6, router solicitation,
length 16
> arp who-has 192.168.3.2 tell 192.168.3.2
> IP6 :: > ff02::1:ff12:3456: ICMP6, neighbor solicitation, who has
fe80::5054:ff:fe12:3456, length 24
> arp who-has 192.168.3.1 tell 192.168.3.2
> arp reply 192.168.3.1 is-at 00:ff:c6:ad:f7:3e (oui Unknown)
> arp who-has 192.168.3.1 tell 192.168.3.2
> arp reply 192.168.3.1 is-at 00:ff:c6:ad:f7:3e (oui Unknown)
> arp who-has 192.168.3.1 tell 192.168.3.2
> arp reply 192.168.3.1 is-at 00:ff:c6:ad:f7:3e (oui Unknown)
> arp who-has 192.168.3.1 tell 192.168.3.2
> arp reply 192.168.3.1 is-at 00:ff:c6:ad:f7:3e (oui Unknown)
> arp who-has 192.168.3.1 tell 192.168.3.2
> arp reply 192.168.3.1 is-at 00:ff:c6:ad:f7:3e (oui Unknown)
>
> It seems like OpenBSD guest doesn't recieve or ignores arp replies.
>
> I also tried Linux LFS LiveCD to check that it's not my qemu
> configuration problem. Did the ususal:
>
> $ ip link set dev eth0 up
> $ ip addr add 192.168.3.2/30 brd 192.168.3.3 dev eth0
> $ ping -c 2 192.168.3.1
>
> And it worked fine (and even ping www.ru, with additional setup).
> Tcpdump:
>
> $ tcpdump -t -r lfs.dump
> reading from file lfs.dump, link-type EN10MB (Ethernet)
> IP6 fe80::2ff:39ff:fe72:bf12 > ip6-allrouters: ICMP6, router solicitation,
length 16
> IP6 fe80::2ff:39ff:fe72:bf12 > ff02::16: HBH ICMP6, multicast listener
report v2, 1 group record(s), length 28
> IP6 fe80::2ff:39ff:fe72:bf12 > ip6-allrouters: ICMP6, router solicitation,
length 16
> IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from
52:54:00:12:34:56 (oui Unknown), length 548
> IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from
52:54:00:12:34:56 (oui Unknown), length 548
> IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from
52:54:00:12:34:56 (oui Unknown), length 548
> arp who-has 192.168.3.1 tell 192.168.3.2
> arp reply 192.168.3.1 is-at 00:ff:39:72:bf:12 (oui Unknown)
> IP 192.168.3.2 > 192.168.3.1: ICMP echo request, id 31748, seq 0, length 64
> IP 192.168.3.1 > 192.168.3.2: ICMP echo reply, id 31748, seq 0, length 64
> IP 192.168.3.2 > 192.168.3.1: ICMP echo request, id 31748, seq 256, length
64
> IP 192.168.3.1 > 192.168.3.2: ICMP echo reply, id 31748, seq 256, length 64
> arp who-has 192.168.3.2 tell 192.168.3.1
> arp reply 192.168.3.2 is-at 52:54:00:12:34:56 (oui Unknown)
>
> Additionally, I've found that OpenBSD sends a 'gratuitous arp request',
> while linux doesn't, but I think that's not the case.
>
> Any guesses?
>
>
--
Aaron Mason - Programmer, open source addict
- Oh, why does everything I whip leave me?
