[CentOS] Dell server dropping packets

Tue Dec 4 17:54:17 UTC 2018
Stephen John Smoogen <smooge at gmail.com>

On Tue, 4 Dec 2018 at 12:13, Jerry Geis <jerry.geis at gmail.com> wrote:
> Hi All - I have a Dell R430 server running CentOS 7.5 that is dropping
> packets on the network.   Its connected to Cisco switch at AUTO for the
> port.  The server reports 1000M on the network. I even changed the setting
> for the switch to 1000M full, that did not seem to make a difference either.

I don't think that FULL/AUTO would have a difference on gigabit
networks that it did with 10/100MBit. When I have seen packet losses
on gigabit it has been STP related where the system  and the switch
keep negotiating spanning tree and stuff just goes poof. The other one
is where a second system says it has the same ip address because some
service is being 'helpful' in failover mode.. but that is less likely

> What else might I look at as to why its dropping packets? Its mainly 90'ish
> percent idle. so not doing much at this time. I have no idea what else is
> happening on the network.
> I set a windows box on the same network and just did a "ping" to the server
> and once in a while it lost the packets or my putty connection dropped
> etc...
> Thoughts? Ideas?
> Thanks!
> Jerry
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Stephen J Smoogen.