Аз не мога да разбера какво точно ти е нужно,не е ясна постановката

Проста емулация на интерфейс става с macvlan.
root@OpenWrt:~# dmesg | grep eth
[ 1.050000] eth0: Atheros AG71xx at 0xba000000, irq 5
[ 1.650000] eth0: Found an AR7240/AR9330 built-in switch
[ 2.880000] eth1: Atheros AG71xx at 0xb9000000, irq 4
[ 3.490000] ag71xx ag71xx.0: eth1: connected to PHY at ag71xx-mdio.0:04 [uid=004dd041, driver=Generic PHY]
[ 7.860000] eth0: link up (1000Mbps/Full duplex)
[ 10.670000] eth0: link down
[ 19.830000] eth0: link up (1000Mbps/Full duplex)
[ 21.310000] device eth0 entered promiscuous mode
[ 24.000000] eth1: link up (100Mbps/Full duplex)
[ 24.220000] br-lan: port 2(eth0) entered forwarding state
[ 24.230000] br-lan: port 2(eth0) entered forwarding state
[ 39.280000] br-lan: port 2(eth0) entered forwarding state
ifconfig -a
br-lan Link encap:Ethernet HWaddr D8:5D:4C:D6:00:37
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:999 errors:0 dropped:0 overruns:0 frame:0
TX packets:856 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:175300 (171.1 KiB) TX bytes:437914 (427.6 KiB)
eth0 Link encap:Ethernet HWaddr D8:5D:4C:D6:00:37
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1038 errors:0 dropped:0 overruns:0 frame:0
TX packets:859 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:198236 (193.5 KiB) TX bytes:438052 (427.7 KiB)
Interrupt:5
eth1 Link encap:Ethernet HWaddr D8:5D:4C:D6:00:39
inet addr:172.17.250.6 Bcast:172.17.250.15 Mask:255.255.255.240
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1224 errors:0 dropped:26 overruns:0 frame:0
TX packets:952 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:461169 (450.3 KiB) TX bytes:180930 (176.6 KiB)
Interrupt:4
ifb0 Link encap:Ethernet HWaddr 2E:42:CD:6E:46:04
BROADCAST NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ifb1 Link encap:Ethernet HWaddr B6:F1:F5:A1:D6:17
BROADCAST NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ip link add link eth1 eth2 type macvlan
ifconfig eth2 hw ether 00:24:01:f9:22:69
root@OpenWrt:~# ifconfig -a
br-lan Link encap:Ethernet HWaddr D8:5D:4C:D6:00:37
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1052 errors:0 dropped:0 overruns:0 frame:0
TX packets:901 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:179012 (174.8 KiB) TX bytes:445238 (434.8 KiB)
eth0 Link encap:Ethernet HWaddr D8:5D:4C:D6:00:37
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1097 errors:0 dropped:0 overruns:0 frame:0
TX packets:905 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:203508 (198.7 KiB) TX bytes:445422 (434.9 KiB)
Interrupt:5
eth1 Link encap:Ethernet HWaddr D8:5D:4C:D6:00:39
inet addr:172.17.250.6 Bcast:172.17.250.15 Mask:255.255.255.240
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1371 errors:0 dropped:33 overruns:0 frame:0
TX packets:982 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:472157 (461.0 KiB) TX bytes:183808 (179.5 KiB)
Interrupt:4
eth2 Link encap:Ethernet HWaddr 00:24:01:F9:22:69
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ifb0 Link encap:Ethernet HWaddr 2E:42:CD:6E:46:04
BROADCAST NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ifb1 Link encap:Ethernet HWaddr B6:F1:F5:A1:D6:17
BROADCAST NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)