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Mac Forum / General / Networking / January 2005Vanishing ethernet
Hi, I tried to post this a week or so ago, but i think the news server ate it (it's not on google); if you've seen it before, apologies. I woke my machine (G4 PowerBook running OS X 10.3.7) up a while ago to find that ethernet wasn't working (ie 'the internet was broken'). When i went to the Network pane in System Preferences, i found that 'Built-in Ethernet' *was missing from the list of network interfaces*. It's still there as an option in the 'Show' drop-down box, but the fields on its pane are all empty. It's there in Network Port Configurations, and ticked, so it should show up (and none of clearing and resetting the tick box, duplicating the entry or creating a new entry have any effect). My Airport still shows up and works, so the ethernet subsystem as a whole (at some level) is still working. ifconfig reports the interface, and even claims it's up, but says it doesn't have an address. I've tried rebooting, and shutting down and starting up, and neither have any effect. I've tried bringing the interface down and up again with ifconfig; no joy there either. Everything worked before new year, and i haven't fiddled with it since - i had't been near an ethernet network until the day it vanished. Now, even if it wasn't working, or if it didn't have an address, the interface should show up in the Network panel, just with a red dot instead of green. What's happening at the moment is completely wrong. So, has anyone got any idea what's going on, or what i might do to fix it? Thanks, tom Who is getting less and less impressed with OS X by the day ...  Signatureunconstrained by any considerations of humanity or decency << My Airport still shows up and works, so the ethernet subsystem as a whole (at some level) is still working. >> Tom- It appears that you are using Airport to access the internet. The fact that you are not getting an address suggests that the problem may be with the Airport link to a base station. In other words, the problem may not be with your PowerBook, but at the other end of the link. Are you using a known-good wireless network, or are you just roaming and using what you find? Perhaps a network you accessed in the past has been changed to require a password or requires your "MAC address" be listed in its access tables. You mention that you woke your machine. Does that mean you never reboot? Try rebooting it! Fred > << My > Airport still shows up and works, so the ethernet subsystem as a whole (at > some level) is still working. >> > > It appears that you are using Airport to access the internet. Certainly am. > The fact that you are not getting an address suggests that the problem > may be with the Airport link to a base station. In other words, the [quoted text clipped - 5 lines] > been changed to require a password or requires your "MAC address" be > listed in its access tables. I think we may be getting our wires crossed here - the problem i'm having is with my wired ethernet, not the wireless. The wireless is working perfectly. I get the wired problem with two completely different hubs, and when i'm not plugged into anything, so i think the problem there's on my machine. > You mention that you woke your machine. Does that mean you never > reboot? Try rebooting it! I did. I used a PC recently enough that it's still a reflex action! Thanks for your suggestions, though. tom Signaturenon, scarecrow, forensics, rituals, bacteria, scientific instruments, .. > Hi, > [quoted text clipped - 29 lines] > tom > Who is getting less and less impressed with OS X by the day ... OK, try the network utility's info and choose en0 If there is no ethernet cable plugged in, it will show Hardware address (00.0a.something) IP address 144.3.8.0 Link speed 0 Mb Link Status Not reported Vendor Apple Model gmac+ What happens when you hook it into your hub depends on whether you are being served DHCP or whether you have to configure the IP address and mask and server address and dns addresses manually. It should look something like IP Address(es) 192.168.1.mumble (for most normal DHCP served up addresses on a home network) Link Speed 100MB (or maybe 10 or 1000) etc. (the same) On rare occasions, the ethernet may get into a sulk and pretend to be not plugged in. I have seen this once in 10.3.7, which is more than I have since 10.2.mumble, when it was fairly frequent on my PB 12". The workaround was to give it time to come good by itself - about a minute or two. Then sleep and wake and repeat the wait. Then reboot and repeat the wait. I think swapping locations and swapping between airport and ethernet might have helped bring it on, but it was very rare and I never found guaranteed way to trigger it, or I would have whinged at Apple. I saw it once while fiddling about with my new Airport Express and waving cables about. I tried just now to reproduce it but it refused to misbehave. So it just might be hardware. SignatureI thought I would be the last on earth to mung my e-mail address. fsnospam$elliott$$ > Hi, > [quoted text clipped - 23 lines] > interface should show up in the Network panel, just with a red dot instead > of green. What's happening at the moment is completely wrong. Try shutting the computer down then restarting it. SignatureClark Martin Redwood City, CA, USA Macintosh / Internet Consulting "I'm a designated driver on the Information Super Highway" > > I've tried rebooting, and shutting down and starting up, and neither > > have any effect. > > Try shutting the computer down then restarting it. Yep. tom Signatureif you can't beat them, build them |
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