[Cialug] ARP cache overflow

[David Champion]

I don't think the tg3 driver is the problem - you'd think if it were, 
I'd be seeing other problems... for instance I don't have any ethernet 
drops or errors:

# ifconfig
eth0      Link encap:Ethernet  HWaddr <removed>
           inet addr:<removed>  Bcast:<removed>  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:4431153 errors:0 dropped:0 overruns:0 frame:0
           TX packets:4224837 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:100
           RX bytes:811120635 (773.5 Mb)  TX bytes:1862807308 (1776.5 Mb)
           Interrupt:28

-dc

Daniel Wittenberg wrote:
> I haven't seen this myself with the tg3 driver, even on heavily loaded
> systems.  However, most manufacturers tell you to use the bcm5700 driver
> instead as it's more stable and higher throughput.
> 
> Dan
> 
> On Tue, 2004-11-30 at 11:54 -0600, David Champion wrote:
> 
>>Has anyone else had trouble with ARP cache overflows? The symptoms I'm 
>>seeing:
>>
>>- dmesg has a lot of "Neighbor table overflow" messages
>>- named showing a bunch of "error sending response: not enough free 
>>resources" in /var/log/messages.
>>
>>I've done some googling around... some people blame it on a bad ethernet 
>>driver for the Broadcom chipset I have - it's the "tg3" driver. Others 
>>say it can be caused by a machine on the LAN that's spoofing their MAC 
>>address, and causing the switches to broadcast all packets (it becomes a 
>>repeater instead of a switch), so they can run a packet sniffer on all 
>>of the traffic.
>>
>>-dc
>>
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