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2 out of 3 Macs online
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Fresh-Faced Recruit
Join Date: Nov 1999
Location: Pasadena, Calif, USA
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Apr 15, 2006, 09:05 PM
 
Up to yesterday, everything on the cable modem-linksys router-airport home Mac network worked. Then all 3 offline. Re-start everything. 2 Macs pick up Earthlink ip address fine. Third one won't, but constantly displays old ip address. Ideas?
     
Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Apr 15, 2006, 10:29 PM
 
Did they actually pick up IPs from earthlink, or local network IPs?
If the former, did you intentionally set it up that way.
     
Fresh-Faced Recruit
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Apr 15, 2006, 11:45 PM
 
Mark,
In my brevity, I left out info. No, the ips came from the local network. The two that work start with 24. The one that doesn't keeps coming up with an address beginning with 69.

Thanks
     
Admin Emeritus
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Location: Zurich, Switzerland
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Apr 17, 2006, 10:00 AM
 
69.254.xxx.xxx is the block of "self-assigned" IP addresses, when the DHCP (automatic assignment from the DHCP server, e.g. the one in the router) fails. Most likely you have a bad port or bad ethernet cable somewhere in the link between the router and 3rd Mac.

tooki
     
Junior Member
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Apr 20, 2006, 12:15 AM
 
169.254.x.x is dynamicaly assigned. Are we talking 169.x.x.x or 69.x.x.x
     
Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
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Apr 20, 2006, 04:25 AM
 
I would try switching Network interfaces from the regular one to any other and then switching back to the right one. Either that or restarting. Sometimes a computer will not pick up on an IP address change.

"The natural progress of things is for liberty to yield and government to gain ground." TJ
     
Admin Emeritus
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Apr 20, 2006, 09:19 AM
 
Originally Posted by ender78
169.254.x.x is dynamicaly assigned. Are we talking 169.x.x.x or 69.x.x.x
Gah, you are right!! Duh, it's 169.254.x.x.

::Brain fart::

But I bet it is still getting a self-assigned IP. (Note to ender78: self-assigned ≠ dynamically assigned.)

tooki
     
Administrator
Join Date: Apr 2001
Location: San Antonio TX USA
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Apr 20, 2006, 10:14 AM
 
69.254.x.x belongs to Comcast.

There are a number of "special" IP ranges. The 127.0.0.0 - 127.255.255.255 range is reserved for "localhost;" one's own local computer; used for loopback testing of the computer's network conection (not limited to the NIC). The range 169.254.0.0 -169.254.255.255 is reserved for self-assigned IPs, for example when the computer cannot find a DHCP server or cannot receive an IP from it.

According to RFC 1918
The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:

10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
It's important to differentiate between a "private" IP and a "self-assigned" IP because they result from very different situations and cause very, VERY different results.
Glenn -----
OTR/L, MOT, Tx
     
Admin Emeritus
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Apr 20, 2006, 12:59 PM
 
Regardless, the OP needs to provide more info in order to help diagnose this.

tooki
     
   
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