[CentOS] Centos machine sometimes unreachable

m.roth at 5-cent.us m.roth at 5-cent.us
Wed Aug 22 20:00:45 UTC 2012


Richard Reina wrote:
> Look like there are some errors although I am not sure what the mean.
>
>  eth0      Link encap:Ethernet  HWaddr 00:D0:B7:5A:C6:FE
>            inet addr:192.168.0.5  Bcast:192.168.0.255  Mask:255.255.255.0
>            inet6 addr: fe80::2d0:b7ff:fe5a:c6fe/64 Scope:Link
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>            RX packets:2316067887 errors:0 dropped:0 overruns:1 frame:1
>            TX packets:2451037674 errors:3 dropped:0 overruns:0 carrier:3
>            collisions:0 txqueuelen:1000
>            RX bytes:221599111550 (206.3 GiB)  TX bytes:575914174697 (536.3
> GiB)
>
> Cable seems fine and machine is in a dark room (no sunlight) although it
> does run through the ceiling.
>
Please stop top posting.

I'm not sure, but overrun? Frame? Not sure. Cabling goes into the
ceiling... was there any wiring or HVAC work done lately, where the cables
might run?

     mark
>
> 2012/8/22 <m.roth at 5-cent.us>
>
>> Richard Reina wrote:
>> > I have a simple perl script that every few hours pings the handful of
>> > machines on my LAN. Lately I've sometimes been getting
>> >
>> > ping of 192.168.0.1 succeeded
>> > ping of 192.168.0.7 succeeded
>> > ping of 192.168.0.5 FAILED
>> > ping of 192.168.0.6 succeeded
>> > ping of 192.168.0.9 succeeded
>> >
>> >   This machine in question has been running Centos faithfully for
>> about
>> > six years and no recent changes to it have been made. When I try and
>> ping the
>> > machine manually it works.   /var/og/messages does not seem irregular.
>> > Does anyone know know what might be the problem or what else I might
>> check?
>>
>> Have you done an ifconfig on 5, and seen if there's any collisions, etc?
>> Another possibility is that *you* haven't changed, but someone else has
>> put a piece of hardware on the LAN that's trying to get that IP, or has
>> it
>> configured for that IP.
>>
>>      mark, who *really* wishes that the network folks would give
>>               their hardware IPs by MAC, not broadcast
>>
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>>
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