Hello ,
I am Palak her from Bangalore. Even I have the same Realtek network card and its working very well on all the Operating Systems. The problem may be can you please just check your network connections and the ipconflict with other machines if any. I think that are the only to possible problems. And above all as you have got a very good network card you can even try out with diskless PC or the disk less client. just configure dhcp in one of the client with the help of ltsp packages and prepare the boot disk for your network card and just boot it from that floppy. If you would like to have more information on this please contact me at,


704, Ashok Heights, Mahalxmi Layout, Bangalore 560096, Karnataka
Ph: (080)31857771,31838551
[EMAIL PROTECTED]

Thank you.

Gaurav Arora wrote:

Hello all,
         I installed redhat 8.0 and I'm having problems with my LAN card. The card is 
a Realtek 8139C. The driver module is installed. However when RH boots, it is unable 
to bring up the NIC. The error I recieve is :

SIOCSIFFLAGS: Device or resource busy

After booting if I do a ifconfig, I get the same error.


The 'dmesg' command gives me the following :


ip_tables: (C) 2000-2002 Netfilter core team
8139too Fast Ethernet driver 0.9.25
PCI: Enabling device 00:10.0 (0004 -> 0007)
PCI: No IRQ known for interrupt pin A of device 00:10.0. Please try using pci=biosirq.
divert: allocating divert_blk for eth0
eth0: RealTek RTL8139 Fast Ethernet at 0xcf862000, 00:e0:4c:e3:62:ff, IRQ 0
eth0:  Identified 8139 chip type 'RTL-8139C'

As you can see the IRQ is 0 for the card. I 'think' this is the reason why I'm unable 
to activate the card. (Please correct me if I'm wrong.) How can I assign the proper 
IRQ since RH doesn't seem to autodetect it?
Moreover, how do I use "Please try using pci=biosirq."?

Moreover, I read somewhere that Linux does not support IRQ > 15 and if APIC is disabled, it would be able to. I have a P4S533-MX ASUS motherboard. How can I disable APIC in it? Is it possible to disable it through grub, like it is possible through lilo.

I've been struggling with the NIC for 3 days, any help would be most appreciated. :)

Gaurav Arora

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