[linux-help] Re: network unreachable

[Steven Saner <ssaner@xxxxxxxxxxxxxxx>]

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.

Any chance that a firewall got setup on the box that is blocking all traffic? 
Do 
iptables -L -n as root and see if anything shows up. You might also post the 
output of ifconfig and netstat -r, just in case.

Steve

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Steven Saner <ssaner@xxxxxxxxxxxxxxx>

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