[linux-help] Re: network unreachable

[Bruce Bales <bbales@xxxxxxx>]

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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