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Dell server dropping packets

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.

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

Comments

Re: Dell server dropping packets

By Gordon Messmer at 12/04/2018 - 13:45

On 12/4/18 9:12 AM, Jerry Geis wrote:

Does the switch have any logs for the port that the server is connected to?

Have you use "arping" to look for an IP address conflict on the network?
(To test for a conflict for address 1.2.3.4 on the network attached to
eth0, use: arping -c 2 -D -I eth0 1.2.3.4)

Re: Dell server dropping packets

By Jonathan Billings at 12/04/2018 - 13:40

On Tue, Dec 04, 2018 at 12:12:25PM -0500, Jerry Geis wrote:
Did you try replacing the cable?

Re: Dell server dropping packets

By Stephen John Smoogen at 12/04/2018 - 12:54

On Tue, 4 Dec 2018 at 12:13, Jerry Geis <jerry. ... at gmail dot com> wrote:
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
here.