strange problem ethernet

sunlinux · 01-02-2007, 04:18 AM

Linux redhat AS 4, just last day it was working ok... suddenly my Ethernet card eth0 is unable to ping any lan pc on the same network saying "destination host unreachable", n nobody can ping my system, i hv checked all cable everything found ok...when i ping local address that reply ok..what went worng ?

look i hv two Lan card , one of them is working absolutely fine... but one has above problem.

yeah i hv configured it with ip address : 192.168.1.50 255.255.255.0,

output of /sbin/sysctl -a is very big . may i post all ot it ?

output of /iptable -nvL :

iptables v1.2.11: Unknown arg `-nvl'
Try `iptables -h' or 'iptables --help' for more information.
[root@mon sunil]# /sbin/./iptables -nvL
Chain INPUT (policy ACCEPT 48986 packets, 23M bytes)
pkts bytes target prot opt in out source destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain OUTPUT (policy ACCEPT 44660 packets, 7479K bytes)
pkts bytes target prot opt in out source destination

Chain sun (0 references)
pkts bytes target prot opt in out source destination

**TheMatt** · 01-02-2007, 03:31 PM

Hi sunlinux,

A couple of things:

Did you check that eth0 is enabled?

Are you using a static IP adress, or are you using DHCP? Try setting eth0 to DHCP.

Did you check that the Domain (or if you are using Samba, the Workgroup) didn't get changed or deleted?

sunlinux · 01-05-2007, 09:42 PM

Dear,

Every thing is ok. you just tell me ,if smone use my MAC address at his card then my network would function ot not ?

I suspect that smone is using my mac address intensionally on his machine. How do i avoid such situation or check the culprit.

01-02-2007, 04:18 AM	#1 (permalink)
sunlinux Registered User Join Date: Jan 2007 Posts: 2 OS: linux	strange problem ethernet Linux redhat AS 4, just last day it was working ok... suddenly my Ethernet card eth0 is unable to ping any lan pc on the same network saying "destination host unreachable", n nobody can ping my system, i hv checked all cable everything found ok...when i ping local address that reply ok..what went worng ? look i hv two Lan card , one of them is working absolutely fine... but one has above problem. yeah i hv configured it with ip address : 192.168.1.50 255.255.255.0, output of /sbin/sysctl -a is very big . may i post all ot it ? output of /iptable -nvL : iptables v1.2.11: Unknown arg `-nvl' Try `iptables -h' or 'iptables --help' for more information. [root@mon sunil]# /sbin/./iptables -nvL Chain INPUT (policy ACCEPT 48986 packets, 23M bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 44660 packets, 7479K bytes) pkts bytes target prot opt in out source destination Chain sun (0 references) pkts bytes target prot opt in out source destination

01-02-2007, 03:31 PM	#2 (permalink)
TheMatt TSF Enthusiast Join Date: May 2006 Location: Boston Posts: 13,701 OS: Win 3.1, 98, NT 4.0, XP Debian 4.0, Kubuntu 6.06 My System Blog Entries: 3	Hi sunlinux, A couple of things: Did you check that eth0 is enabled? Are you using a static IP adress, or are you using DHCP? Try setting eth0 to DHCP. Did you check that the Domain (or if you are using Samba, the Workgroup) didn't get changed or deleted? __________________ - Matt M - KB1OSC - Folding@Home 85015 [url="http://www.techsupportforum.com/hardware-support/"] If TSF has helped you, please consider donating. If I have stopped responding to a thread, feel free to send me a PM with a link to the thread. It is advisable to subscribe to threads so you will receive updates when replies are posted. You can subscribe to threads from the "Thread Tools" Menu. »Memtest86 »Prime95 »UBCD »SpeedFan »NHC Personal »Everest »Sandra »PC Wizard »RivaTuner »ATi Tool Click here for Useful Articles and Guides

01-05-2007, 09:42 PM	#3 (permalink)
sunlinux Registered User Join Date: Jan 2007 Posts: 2 OS: linux	Dear, Every thing is ok. you just tell me ,if smone use my MAC address at his card then my network would function ot not ? I suspect that smone is using my mac address intensionally on his machine. How do i avoid such situation or check the culprit.