Digimer wrote: > On 03/16/2012 04:03 PM, Devin Reade wrote: >> --On Friday, March 16, 2012 07:41:18 PM +0000 Ken Smith >> <kens at kensnet.org> >> wrote: >> >>> Hi all, I swapped a Realtek 8139 100M Net Card for a Realtek 8169 Gig >>> Net card in a Centos 5.6 system. <snip> >> In some cases, they didn't get recognised at boot, either, whereas >> a subsequent reboot *might* make them come back. >> > I've seen the same behavious. Realtek cards are no longer an option for > my builds. I would second Devin and suggest saving yourself a lot of > headaches... Replace with an Intel NIC. The difference in performance > and reliability is staggering. If the OP doesn't/can't go out to buy another NIC, you might try putting HWADDR in ifconfig-eth<whatever>. If it was CentOS 6.x, you'd have to deal with /etc/udev/rules.d/70-persistent-net-rules mark "just had this happen"