[gentoo-user] Re: MAC addresses
Sergey A. Kobzar sergey.kobzar at mail.ru writes: LinkSys switch. It has 2 NICs onboard: How is it possible? Often the MAC is printed on the nic. Some (few) devices have MAC set in firmware and it is hackable. MAC numbering is often suspect in a variety of circumstances. My suggestion is that you surf the open source tools to find something that reveals deeper information about your MAC anomalies. Lots of stuff in: /usr/portage/net-analyzer/ Here's one: net-analyzer/macchanger Description: Utility for viewing/manipulating the MAC address of network interfaces goodluck, James
Re: [gentoo-user] Re: MAC addresses
Thursday, April 30, 2009, 6:22:27 PM, James wrote: Sergey A. Kobzar sergey.kobzar at mail.ru writes: LinkSys switch. It has 2 NICs onboard: How is it possible? Often the MAC is printed on the nic. Some (few) devices have MAC set in firmware and it is hackable. MAC numbering is often suspect in a variety of circumstances. My suggestion is that you surf the open source tools to find something that reveals deeper information about your MAC anomalies. Lots of stuff in: /usr/portage/net-analyzer/ Here's one: net-analyzer/macchanger Description: Utility for viewing/manipulating the MAC address of network interfaces James, thank you for the useful tip. The output of macchanger: # macchanger eth1 Current MAC: 00:15:17:1a:6e:6d (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6e (Intel Corporate) # macchanger eth0 Current MAC: 00:15:17:1a:6e:6c (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6d (Intel Corporate) How is it possible? I thought NIC has one MAC only.What does mean 'Faked MAC'? goodluck, James -- Sergey
Re: [gentoo-user] Re: MAC addresses
Sergey A. Kobzar wrote: James, thank you for the useful tip. The output of macchanger: # macchanger eth1 Current MAC: 00:15:17:1a:6e:6d (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6e (Intel Corporate) # macchanger eth0 Current MAC: 00:15:17:1a:6e:6c (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6d (Intel Corporate) How is it possible? I thought NIC has one MAC only.What does mean 'Faked MAC'? Current MAC = MAC in firmware on the card, Faked MAC = MAC the OS is telling the network?
Re: [gentoo-user] Re: MAC addresses
Anthony Metcalf wrote: Sergey A. Kobzar wrote: James, thank you for the useful tip. The output of macchanger: # macchanger eth1 Current MAC: 00:15:17:1a:6e:6d (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6e (Intel Corporate) # macchanger eth0 Current MAC: 00:15:17:1a:6e:6c (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6d (Intel Corporate) How is it possible? I thought NIC has one MAC only.What does mean 'Faked MAC'? Current MAC = MAC in firmware on the card, Faked MAC = MAC the OS is telling the network? yes, you can set the mac to what ever you want. There's a line in /etc/conf.d/net that explains how to do this (with macchanger). signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] Re: MAC addresses
You can actually change your MAC address using ifconfig for many types of NIC's. --James 2009/4/30 Eric Martin freak4u...@gmail.com Anthony Metcalf wrote: Sergey A. Kobzar wrote: James, thank you for the useful tip. The output of macchanger: # macchanger eth1 Current MAC: 00:15:17:1a:6e:6d (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6e (Intel Corporate) # macchanger eth0 Current MAC: 00:15:17:1a:6e:6c (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6d (Intel Corporate) How is it possible? I thought NIC has one MAC only.What does mean 'Faked MAC'? Current MAC = MAC in firmware on the card, Faked MAC = MAC the OS is telling the network? yes, you can set the mac to what ever you want. There's a line in /etc/conf.d/net that explains how to do this (with macchanger).
Re[2]: [gentoo-user] Re: MAC addresses
Thursday, April 30, 2009, 7:27:43 PM, James wrote: You can actually change your MAC address using ifconfig for many types of NIC's. --James 2009/4/30 Eric Martin freak4u...@gmail.com Anthony Metcalf wrote: Sergey A. Kobzar wrote: James, thank you for the useful tip. The output of macchanger: # macchanger eth1 Current MAC: 00:15:17:1a:6e:6d (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6e (Intel Corporate) # macchanger eth0 Current MAC: 00:15:17:1a:6e:6c (Intel Corporate) Faked MAC: 00:15:17:1a:6e:6d (Intel Corporate) How is it possible? I thought NIC has one MAC only.What does mean 'Faked MAC'? Current MAC = MAC in firmware on the card, Faked MAC = MAC the OS is telling the network? yes, you can set the mac to what ever you want. There's a line in /etc/conf.d/net that explains how to do this (with macchanger). No, I didn't change MAC by OS. My /etc/conf.d/net file: config_eth0=( aa.bb.cc.dd netmask 255.255.255.224 ) routes_eth0=( default via 1.2.3.4 ) config_eth1=( 10.11.1.203 netmask 255.255.255.0 ) Nothing that changes MAC addresses for the NICs... Maybe it's BIOS feature for failover.. It seems I need reboot server to check BIOS settings. -- Sergey
