[linux-help] Re: network unreachable

["Jonathan Hall" <flimzy@xxxxxxxxxx>]

His modem has nothing to do with his ability to ping other devices on his
network.  Not to mention, the switch would blink with activity even if the
modem wasn't working.


> I suppose you have reset the modem by unplugging for a full minute.
> bruce
>
> On Tuesday 02 May 2006 09:01, Jonathan Hall wrote:
>> 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 cox.net cox.ks.net cox.ok.net
>> > nameserver 68.230.242.25
>> > nameserver 68.230.242.30
>> > 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 192.168.1.90 -r 192.168.1.65
>> >>
>> >> 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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