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Mike_L__62783
Nimbostratus
Jan 26, 2011LTM 10.2 - MAC Address Change w/ Different Volume
In trying to apply Hotfix2 for 10.2 tonight we came across a strange issue. We saw the MAC addresses move around between interfaces. For example our external MAC ended in .84 on one volume and in .85 on the other. This caused a network connectivity issue as we had to clear out the ARP cache in order to get things moving. We thought this was strange behavior and were curious if anyone else has seen this or know why it occurs?
- Chris_Miller
Altostratus
Another reason for MAC Masquerading - Mike_L__62783
Nimbostratus
In the CLI they are the interfaces listed when doing an ifconfig. In the GUI you can call them VLANs. Either way they MAC address moved from one VLAN or interface to another when booting to a different volume. - Chris_Miller
Altostratus
Posted By Mike L. on 01/26/2011 09:29 AM - hoolio
Cirrostratus
I think MAC addresses are assigned from lowest to highest address as each VLAN is created. So if you created VLAN1 and then VLAN2 on one slot, but created VLAN2 then VLAN1 on the second slot, the MAC addresses would be reversed between the two. You can see this on a single slot if you create, delete and then recreate two VLANs in opposite order:b vlan VLAN1 {interfaces 2.1} b vlan VLAN2 {interfaces 2.2} b vlan|grep ^VLAN VLAN VLAN1 tag 4094 00:017:60:B3:83 MTU 1500 VLAN VLAN2 tag 4093 00:017:60:B3:84 MTU 1500 b vlan all delete b vlan VLAN2 {interfaces 2.2} b vlan VLAN1 {interfaces 2.1} b vlan|grep ^VLAN VLAN VLAN1 tag 4093 00:017:60:B3:84 MTU 1500 VLAN VLAN2 tag 4094 00:017:60:B3:83 MTU 1500
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