On Tue, 4 Dec 2018 at 12:13, Jerry Geis jerry.geis@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 here.

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 _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos

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

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)