CentOS 5.5 seth0 Dropping packets


  • I have a Plesk CentOS 5.5 VM running in Hyper-V that seems to drop about 1% of its packets.  The host itself does not drop any packets, just the VM.  I've tested having both the host (Server 2008) and the client (CentOS 5.5) simultaneously and I can see that the host doesn't have any interuptions while the client does. 

    ifconfig shows:

    seth0     Link encap:Ethernet  HWaddr 00:15:5D:01:6F:00
              inet addr:x.x.x.x  Bcast:x.x.x.x  Mask:
              inet6 addr: fe80::215:5dff:fe01:6f00/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:209304597 errors:0 dropped:0 overruns:0 frame:0
              TX packets:194666860 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:120617262583 (112.3 GiB)  TX bytes:108309221137 (100.8 GiB)

    ping shows:

    2090 packets transmitted, 2061 received, 1% packet loss, time 2108778ms
    rtt min/avg/max/mdev = 0.000/7.710/980.522/41.922 ms

    While the adapter status shows everything is fine (whatever it is checking); ping, ssh, and snmp drop continually.  Is there anything that needs to be done specifically for a Redhat NIC to work properly inside Hyper-V?

    • Edited by lekcomp Tuesday, February 07, 2012 9:54 PM added detail
    Tuesday, February 07, 2012 9:50 PM


All replies

  • Before we continue this, you have installed Linux Integration services in the guest OS? from here:

    they will smooth out some odd issues you might experience =)

    Saturday, February 11, 2012 11:36 PM
  • I already installed the v2.1 about a year ago.  Does it need to be upgraded?  The pdf for that version shows it supports:  Red Hat Enterprise Linux 6.0 and 6.1 x86 and x64.  No mention of previous versions.
    • Edited by lekcomp Thursday, February 16, 2012 5:18 PM Additional Info
    Thursday, February 16, 2012 2:26 PM
  • We encounter the same problems. Random packet drops running CentOS 5.8 under Hyper-V R2 (fully updated). Do you really recommend upgrading to Linux Integration Services >= 3 with CentOS 5?
    Tuesday, April 10, 2012 7:17 PM