AW: Arp Cache issue

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Hello,

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-----Ursprüngliche Nachricht-----
Von: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] Im Auftrag von Richardson, Joshua A.
Gesendet: Mittwoch, 13. Juli 2011 16:18
An: General Red Hat Linux discussion list
Betreff: RE: Arp Cache issue

Can you post your /etc/sysctl.conf file?  Maybe the answer resides in your arp cache size limits and garbage collection frequency?

Thanks!

Josh Richardson
General Dynamics AIS

-----Original Message-----
From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of brian irvin
Sent: Wednesday, July 13, 2011 9:34 AM
To: General Red Hat Linux discussion list
Subject: Re: Arp Cache issue

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@xxxxxxxxxxxxx> wrote:

> From: Georgios Magklaras <georgios@xxxxxxxxxxxxx>
> Subject: Re: Arp Cache issue
> To: "General Red Hat Linux discussion list" <redhat-list@xxxxxxxxxx>
> 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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