[Gllug] Intermittent Network Loss on Centos Web Server

[George Siddiqui]

I'm experiencing regular intermittent (10-20 per day)  network dropout
(over SSH and HTTP) on a web server running Centos 5.3 and was
wondering if someone here could suggest what I could try next.

Much of the time  the network connection resumes itself - sometimes
not.  When it doesn't (strangely enough) if I log the machine back on
to itself as root via ssh - all network services resume for a number
of hours till then it fails again.

Things I have tried already:

-Checked for duplicate IP's on network
-Swapped Network cable
-Swapping from eth0 to eth1
-Updated the broadcom driver from v3.93 v3.99
-Turned off the acpid service
-Turned off the NetworkManager service

It's using the tg3 driver for a broadcom nic.

system logs shows the following but the eth1 is not ready messages
does not correspond directly to any of the many network outages

Sep 22 09:25:34 myserver kernel: eth1: Tigon3 [partno(BCM95703A30) rev
1002] (PCIX:100MHz:64-bit) MAC address*************
Sep 22 09:25:34  myserver kernel: eth1: attached PHY is 5703
(10/100/1000Base-T Ethernet) (WireSpeed[1])
Sep 22 09:25:35 myserver kernel: eth1: RXcsums[1] LinkChgREG[0]
MIirq[0] ASF[0] TSOcap[1]
Sep 22 09:25:35 myserver kernel: eth1: dma_rwctrl[769c4000] dma_mask[64-bit]

Sep 22 09:25:40 myserver kernel: process `sysctl' is using deprecated
sysctl (syscall) net.ipv6.neigh.lo.base_reachable_time; Use
net.ipv6.neigh.lo.base_reachable_time_ms instead.
Sep 22 09:25:40 myserver kernel: ADDRCONF(NETDEV_UP): eth1: link is not ready
Sep 22 09:25:40 myserver kernel: tg3: eth1: Link is up at 1000 Mbps,
full duplex.
Sep 22 09:25:40 myserver kernel: tg3: eth1: Flow control is on for TX
and on for RX.

[root at myserver ~]# ifconfig -a

eth1      Link encap:Ethernet  HWaddr ***********
          inet addr:*********** Bcast:***********  Mask:***********
          inet6 addr: fe80::20d:60ff:fe1c:22d1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:176071 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24085 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:17341622 (16.5 MiB)  TX bytes:18926143 (18.0 MiB)
          Interrupt:177


Much thanks in advance,

George
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