[ale] Odd network issue

[leam hall]

Okay, yeah...that's odd. Is there more than one NIC? Can you swap out NICs?
Maybe freshen all the OS packages to ensure there's no module or kernel
wonkiness?



On Thu, Jul 9, 2015 at 9:17 AM, Lightner, Jeff <JLightner at dsservices.com>
wrote:

>  We have a server that appears to be unable to connect to various IPs
> (mostly printers) in our WAN at times.
>
>
>
> The odd thing is that the interface is not down on either the server or
> the printer.   The server can reach multiple other IPs when this occurs but
> for some reason can’t reach a few.    Similarly when this occurs we can
> reach these other IPs from other servers in the same VLAN.
>
>
>
> There are no errors shown in statistics on the interface (eth0) on the
> server nor on the port it attached to on the switch.   There are no errors
> shown in /var/log/messages or dmesg.
>
>
>
> The IPs are not always the same ones.   In fact yesterday when we saw the
> issue on IPs I tested the IPs that it couldn’t reach the day before that
> I’d resolved and they were still working.
>
>
>
>
>
> We’ve tried:
>
> Killing the lp process that is hung at the start of this issue on server
> side.
>
> Clearing arp on the server.
>
> Clearing arp on the switch.
>
> Bouncing cups (note issue is NOT just cups – when this occurs we can not
> ping the affected IPs nor can we telnet in on port 9100 as we would
> normally be able to do).
>
>
>
> The only thing that seems to resolve the issue (and does each time) is
> having the interface bounce on the server.
>
> We’’ve done that by:
>
> Rebooting the server
>
> Ifup/ifdown on the server interface
>
> Removing and reseating the cable.
>
> Resetting the switch port.
>
> In each of those we see the port go down then come back up and after that
> the previously unreachable IPs are again reachable.
>
>
>
> I’m suspecting a bad interface port on either the server or the switch but
> in the absence of actual errors can’t prove one way or the other.
>
>
>
> This is different than any other network issue I’ve seen.   I’m wondering
> if anyone has run into this and can shed any light on it?
>
>
>
>
>
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-- 
Mind on a Mission <http://leamhall.blogspot.com/>
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