I have a very strange problem I am unable to find a solution to for a long time now. I am experiencing a problem with the NIC dropping packets constantly even if there's no IP assigned to it. Details below.
I have a HyperV cluster running many CentOS 6 and CentOS 7 guests. The CentOS 6 guests NIC have no packet drop at all. I have installed one CentOS 7 guest 6 months ago and it had no packet drop either. The guest server was not rebooted since then and it was working fine until I updated the kernel and rebooted it. It has the packet drop now.
Other CentOS 7 guests that I am installing from scratch are experiencing the same packet drop. Basically it started at some point after OS updates.
Technical data below:
Code: Select all
[root@console ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.36.0.83 netmask 255.255.255.0 broadcast 10.36.0.255
inet6 fe80::2914:fce8:888b:f128 prefixlen 64 scopeid 0x20<link>
ether 00:15:5d:fe:c2:0f txqueuelen 1000 (Ethernet)
RX packets 335 bytes 28650 (27.9 KiB)
RX errors 0 dropped 185 overruns 0 frame 0
TX packets 67 bytes 13079 (12.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@console ~]# lsmod | grep hv
hv_utils 25808 2
ptp 19231 1 hv_utils
hv_balloon 22083 0
hv_storvsc 22446 3
scsi_transport_fc 64007 1 hv_storvsc
hv_netvsc 46215 0
hv_vmbus 49810 7 hv_balloon,hyperv_keyboard,hv_netvsc,hid_hyperv,hv_utils,hyperv_fb,hv_storvsc
[root@console ~]# lshw -class network
*-network
description: Ethernet interface
physical id: 1
logical name: eth0
serial: 00:15:5d:fe:c2:0f
capabilities: ethernet physical
configuration: autonegotiation=off broadcast=yes driver=hv_netvsc duplex=full firmware=N/A ip=10.36.0.83 link=yes multicast=yes
Please help.
Thanks