Arp Cache issue

[J. D.]

There is am issue with older bnx2 kernel modules in rhel5. There is a kb
article that explains how to disable MSIX or update the kernel.
On Jul 13, 2011 8:38 AM, "brian irvin" <brian944us at yahoo.com> wrote:
> We are using bnx2 driver. We are getting outages when arp table fills up
and unless we flush the table, network connectivity is an issue.
>
> more ifcfg-bond0
> DEVICE=bond0
> BONDING_OPTS="mode=1 miimon=500 primary=eth4"
>
>
> Thanks
>
> Brian
>
>
> --- On Tue, 7/12/11, Georgios Magklaras <georgios at biotek.uio.no> wrote:
>
>> From: Georgios Magklaras <georgios at biotek.uio.no>
>> Subject: Re: Arp Cache issue
>> To: "General Red Hat Linux discussion list" <redhat-list at redhat.com>
>> Date: Tuesday, July 12, 2011, 9:41 PM
>> On 07/12/2011 09:46 PM, brian irvin
>> wrote:
>> > We have a RHEL 5 box which requires frequent flushing
>> of arp cache to stay up and running and not create network
>> bottlenecks. Anyone have these issues? we have quite a few
>> servers and have never faced an issue before this one. I
>> thought it might have to do with the switch but the network
>> folks say the switch is clear. Any thoughts??
>> >
>> > cat /proc/net/bonding/bond0
>> > Ethernet Channel Bonding Driver: v3.4.0 (October 7,
>> 2008)
>> >
>> > Bonding Mode: fault-tolerance (active-backup)
>> > Primary Slave: eth4
>> > Currently Active Slave: eth4
>> > MII Status: up
>> > MII Polling Interval (ms): 500
>> > Up Delay (ms): 0
>> > Down Delay (ms): 0
>> >
>> > Slave Interface: eth0
>> > MII Status: up
>> > Link Failure Count: 0
>> > Permanent HW addr: 00:37:c9:38:e3:3b
>> >
>> > Slave Interface: eth4
>> > MII Status: up
>> > Link Failure Count: 0
>> > Permanent HW addr: 00:11:17:4c:ee:22
>> >
>> >
>> > Thanks
>> >
>> > Brian.
>> >
>>
>> Can you clarify a bit the staying up and running/bottleneck
>> issue? What happens if you do not flush the ARP table in
>> terms of what you see in the system and what do you see on
>> the LAN side for the system? Also which Ethernet driver
>> module you use in the system?
>>
>> I have seen issues with IP aliasing (not HA bonding) on
>> very busy LANs, but long time ago, not on recent 5 releases.
>> As far as I know, unless you use a load balancing mode
>> bonding, the netwrk switch should not be tweaked.
>>
>>
>> GM
>>
>> -- -- George Magklaras PhD
>> RHCE no: 805008309135525
>>
>> Senior Systems Engineer/IT Manager
>> Biotek Center, University of Oslo
>> EMBnet TMPC Chair
>>
>> http://folk.uio.no/georgios
>>
>> Tel: +47 22840535
>>
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>
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