Did you try a cold boot? I have seen problematic network drivers that work after a cold boot, but fail if you do a warm boot on a box.
Have you tried "ethtool eth0"? Does it show link detected? It might be worth trying a live cd of something newer that would more likely support network of newer chipsets automatically at bootup, such as a live version of the latest fedora, ubuntu, or knoppix. ----- Original Message ----- > From: "Larry Linder" <larry.lin...@micro-controls.com> > To: scientific-linux-users@listserv.fnal.gov > Sent: Friday, March 7, 2014 4:47:01 PM > Subject: SL 6.4 Ethernet Port is dead - maybe > > I am looking for a way to check the functionality of an Ethernet port > on a 4 > mo old new system. We use this box for number crunching and > reducing data. > Since no one uses the desktop we left it as "Gnome" and set up > network. This > also the same box we found the SL 6.x had a broken driver for the > chip set. > Thanks to some serious help we were able to download the driver for > the > Ethernet chip set and it worked for a long time. > > After a power failure on a clear day we noticed that it would boot > and run but > no intranet. The power failure was city wide for about 5 sec. Just > enough > to turn on the UPS,s and EM Lights. > > I have look on the net and there is a lot of people offering > suggestions but > nothing you can hang you hat on. Most just reference a lot of > applications. > > Tried: > drop down's for "preferences" and network set up. restart "network" > & > NetworkManagement" . These look OK. > > Apps: > "ifconfig" > etho: says that it read a large number of packets and transmitted > none. > > "ss" > gives a lot of information but Its pretty criptic to say the least. > > The Ethernet chip set is on the mother board and I hate to dismantel > it > replace the mother board and have the same problem. I was looking > for a way > to test it with a loop back scheme and monitor the transmission with > a scope. > The Ethernet chip set supports 10/100/1000 megHz. Because of the > size of the > data sets we need the 1 g. rate. We plan to upgrade our entire > network to 1 > G router, and switches once this problem is resolved. > Only change one thing at a time. > > Larry Linder >