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[linux-help] Re: network unreachable

[linux-help] Re: network unreachable

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To: linux-help@xxxxxxxxx
Subject: [linux-help] Re: network unreachable
From: "Jonathan Hall" <flimzy@xxxxxxxxxx>
Date: Tue, 2 May 2006 09:01:40 -0500 (CDT)
Reply-to: linux-help@xxxxxxxxx

That could not cause a 'network unreachable' error.  If resolv.conf was
borked, the worst that would happen would be 'host not found' type of
errors.  That's something _completely_ different.

> Of course don't know what could change it, but how about
> /etc/resolv.conf?  I have
> search
> nameserver
> nameserver
> bruce
> On Tuesday 02 May 2006 01:41, Tom Hull wrote:
>> Jonathan Hall wrote:
>> > Sounds like hardware to me.
>> >
>> > Does the link light come on (either on the NIC, or on the switch) when
>> > the cable is plugged in?
>> Both lights come on. Speed is 100mbs. Don't see any blinking when I run
>> something like:
>>    ping -i 0 -f -I eth0 -r
>> which floods out thousands of ping packets. Seems like the hardware
>> level is functioning, but something is blocking data transmission.
>> Similar command from other end doesn't blink light either, so receipt
>> also seems to fail.
>> Could be hardware, I suppose, but doesn't seem all that likely on a
>> new machine that had been working smoothly. What else could it be?
>> One difference between this machine and others is that netstat -r
>> shows MSS = 0 here vs. 40 on others. Haven't figured out how to
>> set/change that, even though route(8) suggests it should work.
>> >>I have a problem on a recently built Ubuntu Linux system. Sometime in
>> >>the last day or two the machine lost its network connection. Ethernet
>> >>controller is on the motherboard. It is configured with a static
>> >>address, and can ping that address but nothing else on the local
>> >>network. Changing cable and/or port on the otherwise working switch
>> >>has no effect. We had some trouble yesterday when my gateway machine
>> >>couldn't get a DHCP address from Cox for a period of several hours.
>> >>Not sure whether the Ubuntu machine problem occurred at that time,
>> >>since I didn't notice it until much later. I've rebooted since then.
>> >>Don't see anything obviously wrong, e.g. in netstat -r or iptables -L.
>> >>
>> >>Aside from hardware, is there anything you can think of that might
>> >>cause a Linux machine to effectively disconnect itself from a local
>> >>network?
>> >>
>> >>Thanks.
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