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Re: System log MAC addresses changes with strange IP address?



I have the following listing in my Xserver system log. Can someone tell me what is happening? These are not in my IP address space.

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Oct 25 10:13:12 physio1 kernel: arp: 169.254.78.156 moved from 00:50:0f:04:2c:81 to 00:0a:95:97:55:0c on en0
Oct 25 11:26:04 physio1 kernel: arp: 169.254.135.143 moved from 00:03:93:b3:df:da to 00:50:0f:04:2c:81 on en0
Oct 25 11:26:04 physio1 kernel: arp: 169.254.135.143 moved from 00:50:0f:04:2c:81 to 00:03:93:b3:df:da on en0
Oct 25 11:42:51 physio1 kernel: arp: 169.254.80.45 moved from 00:0a:95:c1:cf:6c to 00:50:0f:04:2c:81 on en0
Oct 25 11:42:51 physio1 kernel: arp: 169.254.80.45 moved from 00:50:0f:04:2c:81 to 00:0a:95:c1:cf:6c on en0
Oct 25 11:57:08 physio1 kernel: arp: 169.254.2.4 moved from 00:0a:95:ea:50:80 to 00:50:0f:04:2c:81 on en0
Oct 25 11:57:08 physio1 kernel: arp: 169.254.2.4 moved from 00:50:0f:04:2c:81 to 00:0a:95:ea:50:80 on en0
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Not knowing anything about your network, I'd say this looks like you have a bunch of clients that initially come up with self-assigned addresses (in the 169.254.x.x range), then acquire a "real" address (probably via DHCP), leaving those self-assigned addresses open for someone else to use. So a machine comes up, grabs a self-assigned IP that another had used earlier, and your system is telling you that the MAC address associated with that IP in its ARP cache has changed.

I'd be curious why you apparently have so many machines using
self-assigned addresses. Maybe the response time of your DHCP
servers needs to be looked at?

_____________________________________________________________
Leon Towns-von Stauber          http://www.occam.com/leonvs/
"We have not come to save you, but you will not die in vain!"

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References: 
 >System log MAC addresses changes with strange IP address? (From: "Larry Tague" <email@hidden>)
 >Re: System log MAC addresses changes with strange IP address? (From: Horst Hoesel <email@hidden>)
 >Re: System log MAC addresses changes with strange IP address? (From: Larry Tague <email@hidden>)



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