carlosdl Apr 13, 2011   6:13 PM GMT

Are there any active iptables' filtering rules ? Have you tried clearing them ? Are the linux box and the machine from which you are trying to ping it in the same subnet ?

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Subhendu Sen Apr 14, 2011   5:38 AM GMT

When the menu comes, press space bar and try add the command like "pci=routeirq" (without quote) to kernel line in the default menu. After logging with root privilege open terminal box and try ping like ping 127.0.0.1 or ping localhost. If it responds then ok and u may go and reconfigure the network card with proper IP address. If not again restart RH and pass the command as "pci=noirq" as mentioned earlier. Also see the BIOS settings ! If possible post here the "/etc/sysconfig/network" & /etc/sysconfig/network-scripts/ifcfg-eth0 details. What is the result of u pass the command like ifup eth0 and dmesg (and see the name of the NIC card like r8169 / r8168B or what is this !) Please provide some info with quick reply

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Zhetmasta Apr 14, 2011   6:38 AM GMT

@Carlosdl active iptables are there but none were tampered with, problem just evolved from nowhere. @rechil pci=routeirq has got no reponse it just goes back prompt. /etc/sysconfig/network shows NETWORKING=YES and HOSTNAME=courem.co.zw /etc/sysconfig/network-scripts/ifcfg-etho shows DEVICE-eth0 BOOTPOTO=static ONBOOT=YES ethereal = e100 NIC is up

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Subhendu Sen Apr 14, 2011   7:25 AM GMT

"pci=routeirq has got no reponse it just goes back prompt"., sorry I did not understand this. Did u pass the command at Kernel Line parameter.... or try pci=noirq or replace the command with acpi=off and press Enter Key. Remember, the command pass as run time and not to write permanently in grub / lilo. I guess e100 nic driver duplex mismatch probs ! Could u send the output of 'ethtool eth0' and 'ethtool -i eth0' as well as the output from "dmesg" when the device autonegotiates to 100-Half !

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carlosdl Apr 14, 2011   10:01 PM GMT

"Could you send the output of 'ethtool eth0' and 'ethtool -i eth0' as well as the output from 'dmesg' when the device autonegotiates to 100-Half?" Rechil, what are you talking about ?? Who said the NIC is autonegotiating to 100-half ? Why do you almost always just copy-paste comments and even questions other people post on other sites ? That exact text comes from a RHEL bug report (related to duplex mismatch issues):Bug 235749 - e100 nic driver duplex mismatch (RHEL5) Please, stop doing that. It is bad for the site's reputation.

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carlosdl Apr 14, 2011   10:11 PM GMT

Zhetmasta, if possible, I would temporarily clean all filtering rules just to be completely sure it is not a firewall issue. How about other devices in between (switches or routers) ? Did something change (on the linux box or other devices on the network) about the time when this started to happen ?

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