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Date:      23 Jan 2011 02:38:34 -0000
From:      John Levine <>
Subject:   Changing the MAC address on a LAN adapter
Message-ID:  <20110123023834.19098.qmail@joyce.lan>

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My Lenovo laptop running 8.1 has two ordinary Intel network adapters,
a wired PRO/1000 with the em driver and a WiFi PRO/Wireless 5300 with
the iwn driver.  They work fine, but for either one if I use ifconfig
to change the MAC address, the adapter won't actually work until I
change the address back to the native one.  Typical symptoms are
endless DHCP queries with no response.

Is this a known problem?  As far as I know, it's supposed to work.


PS: If you were wondering, obnoxious airport wifi that cuts you off
after an hour and won't let you back on until the next day, keyed by
MAC address.

em0: <Intel(R) PRO/1000 Network Connection 7.0.5> port 0x1840-0x185f mem 0xf2600000-0xf261ffff,0xf2625000-0xf2625fff irq 20 at device 25.0 on pci0
em0: Using MSI interrupt

iwn0: <Intel(R) PRO/Wireless 5300> mem 0xf2500000-0xf2501fff irq 17 at device 0.0 on pci3
iwn0: MIMO 3T3R, MoW, address 00:21:6a:b5:18:48
iwn0: [ITHREAD]
iwn0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
iwn0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
iwn0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps

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