Хост - CentOS 5.7, гость - CentOS 6.3, одна из сетевых карт хоста проброшена гостю через PCI passthrough.
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x06' slot='0x01' function='0x0'/>
</source>
</hostdev>
0:nbw@nsv1:~% dmesg | grep -B1 eth0
e100 0000:00:06.0: PCI INT A -> Link[LNKB] -> GSI 11 (level, high) -> IRQ 11
e100 0000:00:06.0: eth0: addr 0xc4001000, irq 11, MAC addr 00:02:b3:a2:e8:1a
0:nbw@nsv1:~% lspci -nn | grep Ethernet
00:03.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device [1af4:1000]
00:06.0 Ethernet controller [0200]: Intel Corporation 82557/8/9/0/1 Ethernet Pro 100 [8086:1229] (rev 0c)
0:nbw@nsv1:~% sudo ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: No
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: g
Current message level: 0x00000007 (7)
Link detected: yes
0:nbw@nsv1:~% sudo mii-tool -v eth0
eth0: negotiated 100baseTx-FD, link ok
product info: Intel 82555 rev 4
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
link partner: 100baseT4 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
# А это конфиг интерфейса, ничего запредельного
0:nbw@nsv1:~% cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE="eth0"
HWADDR="00:02:B3:A2:E8:1A"
NM_CONTROLLED="no"
ONBOOT="yes"
TYPE="Ethernet"
BOOTPROTO=none
0:nbw@nsv1:~% sudo ifup eth0
RTNETLINK answers: Connection timed out
RTNETLINK answers: Network is down
Что это? Может, я что-то делаю не так? о_о
UPD: dmesg'и и прочие messages'ы молчат.