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?
