This is the same problem we experianced with SL 6.0 in August 13. ( Two years ago ). - the comm chip set is not broken. Run ifconfig and you can see that it Receives data but no transmit. SL 5.10 works. SL 6.0 and later versions have a mistake in driver and kernal, are broken..
We used a ELRepo kernal and driver to fix problem with SL 6.5. It has worked well for 2 years. We gave up on SL 7 ect. for a server / back up. We just purchased a raid box with 10 slots and it uses Linux with a wonderful clean and logical desk top. For other boxes in plant we decided drop back to SL 6.7 which works pretty well. But no Ethernet as in SL 6.5. Looking for an Elrepo driver and Kernel to fix problem. There is not a set for SL 6.7. Anyone have any idea when we might see the driver and kernel. When I am looking at complaints with with install problems the Ethernet problem may contribute to a lot of these unhappy campers. It is too bad the upstream vender did not fix the problem up front. It would have saved a lot of people a lot of fooling around. Leaving broken problems unfixed is a mistake and just conpounds the orrig. error. As the versions move along and the number of users expands things just get worse. Thank You Larry Linder