getting a false/wrong ip address from dhcp

groovie1971 · 12-24-2006, 10:05 AM

Hello,

Yesterday, I did a fresh install of centos 4.4 / “minimal install”
I keep getting a false/wrong ip address from dhcp.
When I set a fixed IP it still does not work, I can not make use of the Internet.
If I connect to the internet running Windows everything works fine, so it is not a network issue I think. I tried several solutions (from reading forum posts etc..) but nothing seems to help. Could somebody point me in the good direction ?

This is what happens:

Quote:

[root@ANACONDA ~]# dhclient eth0
Listening on LPF/eth0/00:11:95:d8:93:16
Sending on LPF/eth0/00:11:95:d8:93:16
Sending on Socket/fallback
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 10.90.15.251
Bound to 10.90.12.95 – renewal in 300371 seconds

Quote:

[root@ANACONDA ~]# ifconfig eth0
eth0
Link encap:Ethernet HWaddr 00:11:95:D8:93:16
inet addr:10.90.12.95 Bcast:255.255.255.255 Mask:255.255.248.0
inet6 addr: fe80::211:95ff:fed8:9316/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:12007 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:723274 (706.3 KiB) TX bytes:1062 (1.0 KiB)
Interrupt:5 Base address:0xaf00

This is what my ifcfg-eth0 looks like:

Quote:

[root@ANACONDA ~]#cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:11:95:D8:93:16
ONBOOT=yes
TYPE=Ethernet
DHCP_HOSTNAME=ANACONDA.localdomain

Thanks, JJ

ppuru · 12-24-2006, 06:16 PM

what should be the appropriate DHCP address?

Check the contents of /var/lib/dhcp/dhcp*leases on the client (ANACONDA?). Delete that file. and run dhclient again.

groovie1971 · 12-25-2006, 08:45 AM

Quote:

Originally Posted by ppuru

what should be the appropriate DHCP address?

195.162.196.246
Looks like the dhcp server is correct?

Quote:

Originally Posted by ppuru

Check the contents of /var/lib/dhcp/dhcp*leases on the client (ANACONDA?). Delete that file. and run dhclient again.

result:

Quote:

lease {
interface "eth0";
fixed-address 10.90.12.95;
filename "disable.cfg";
option subnet-mask 255.255.248.0;
option time-offset 1;
option routers 10.90.15.254;
option dhcp-lease-time 519448;
option dhcp-message-type 5;
option domain-name-servers 195.162.196.246;
option dhcp-server-identifier 195.162.196.246;
option broadcast-address 255.255.255.255;
renew 4 2006/12/28 04:04:09;
rebind 6 2006/12/30 19:29:00;
expire 0 2006/12/31 13:31:11;
}

Windows "ipconfig /all"

Quote:

IP-address: 87:244.179.xxx
Subnetmasker: 255.255.255.0
Standaardgateway: 87.244.179.254
DHCP-server: 195.162.196.246
DNS-servers: 195.162.196.3 / 195.162.196.5

my centos pc is directly wired to a ARRIS cablemodem "model: CM450B" not connected to routers/switches.

JJ

Jaiprakash · 12-25-2006, 08:52 AM

Please update result of the following command in this thread

netstat -nr

groovie1971 · 12-25-2006, 09:15 AM

Quote:

Originally Posted by Jaiprakash

Please update result of the following command in this thread

netstat -nr

Result:

Quote:

[root@ANACONDA dhcp]# netstat -nr
Kernel IP routing table

Destination
1) 10.90.8.0
2) 0.0.0.0

Gateway
1) 0.0.0.0
2) 10.90.15.254

Genmask
1) 255.255.248.0
2) 0.0.0.0

Flags
1) U
2) UG

MSS Window
1) 0 0
2) 0 0

irtt Iface
1) 0 eth0
2) 0 eth0

JJ

jschiwal · 12-25-2006, 09:42 AM

Where does the fixed-address entry come from. It there an /etc/dhclient.conf file that it is being copied from?

groovie1971 · 12-25-2006, 10:03 AM

Quote:

Originally Posted by jschiwal

Where does the fixed-address entry come from. It there an /etc/dhclient.conf file that it is being copied from?

I found a dhclient-eth0.conf file

Quote:

[root@ANACONDA etc]# cat dhclient-eth0.conf
send host-name "ANACONDA.localdomain"; # temporary RHL ifup addition

this morning i formatted the hdd and did a fresh install of centos "minimal".

i did not change any settings during/after setup.

my ANACONDA looks like a little worm right now

JJ