Odd NIC packet drop

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izghitu
Posts: 1
Joined: 2018/04/11 19:45:48

Odd NIC packet drop

Post by izghitu » 2018/07/26 04:36:47

Hi,

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
Does anyone have any ideas about this?
Please help.
Thanks

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