Duplicate IP problem on CentOS 5.7

pinoyskull · 02-05-2012, 06:14 PM

Hi,

I have a VM running on CentOS 5.7 and weird thing is eth0 and eth1 has same IP every time i do a server restart, even though on the config (ifcfg-eth0 and ifcfg-eth1) it's not.

Where the hell did it get the IP?

Quote:

eth0 Link encap:Ethernet HWaddr E8:9A:8F:91:C4:0F
inet addr:10.100.1.1 Bcast:10.100.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:93 errors:0 dropped:0 overruns:0 frame:0
TX packets:40 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11173 (10.9 KiB) TX bytes:6641 (6.4 KiB)
Interrupt:90 Memory:e8000000-e8012800
eth1 Link encap:Ethernet HWaddr E8:9A:8F:91:C4:10
inet addr:10.100.1.1 Bcast:10.100.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:199 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:140507 (137.2 KiB)
Interrupt:98 Memory:ea000000-ea012800

Quote:

[root@xxx ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Broadcom Corporation NetXtreme II BCM5716 Gigabit Ethernet
DEVICE=eth0
BOOTPROTO=static
BROADCAST=10.100.255.255
HWADDR=E8:9A:8F:91:C4:0F
IPADDR=10.100.1.1
NETMASK=255.255.0.0
NETWORK=10.100.0.0
ONBOOT=yes
[root@xxx ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
# Broadcom Corporation NetXtreme II BCM5716 Gigabit Ethernet
DEVICE=eth1
BOOTPROTO=static
HWADDR=E8:9A:8F:91:C4:10
IPADDR=172.16.1.1
NETMASK=255.255.0.0
ONBOOT=yes
[root@pratesis-1-1-mcc1 ~]#

but if you do a network restart (/etc/init.d/network restart) it will fix the problem

jhwilliams · 02-05-2012, 09:41 PM

I would take the following actions:

First, add NETWORK=172.16.0.0 and BROADCAST=172.16.255.255 lines for eth1.

Next, clear your DHCP lease files, cause it can't hurt.

Code:

rm -r /var/lib/dhcp/*.lease

Or more drastically, remove the dhclient all-together.

Now, reboot and see what comes of it.

pinoyskull · 02-06-2012, 03:39 AM

whoa! why did't i saw that, btw the 2 lines fixes the problem, no need for the removal of the leases (im not using it anyway).

Thanks dude.