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Shinichi Kido wrote:
>
> Dear all,
>
> If anyone may give some advice to my concerns, it would be very helpful
> and would like to appreciate.
>
> 1) Gratuitous ARP interval
>
> I'm setting two nodes cluster with heartbeat and checked the timing
> when the gratuitous arp broadcast, using tcpdump.
> I found the packet broadcasted when the fail over occurs, but it
> looks likes never be broadcasted at regular intervals.
yes, normal arp takes over after that
> If so, when the router facing to WAN, missed to receive the arp, due
> to network congestion, etc, the service would be unavailable till
> the arp cash expires.
yes, but since your network is congested, it doesn't matter, since nothing
is getting through.
> Is it possible to set to broadcast gratuitous arp constantly from
> active server, regardless of the failover?
yes, but I would kick you off the network if I was running it.
Your problem is with congestion not with arp.
> 2) Strange phenomenon
>
> I set static MAC address table corresponds to virtual ip (10.0.0.1)as
> BBBBBBBBBB(MAC address of Back up), experimentally on my client pc.,
> and made ping test to virtual ip(10.0.0.1).
> Actually, it replies.
perhaps I'm missing something. Why shouldn't it reply?
> $B"((BI tried arp request fo 10.0.0.1 many times, and all the reply was
> collect(Address of Active Server).
I do not understand this.
> Cannot find output of virtual interface eth0:0 in BackUP
eth0:0 does not exist. Only eth0 exists. the ":0" is an arguement
to the ifconfig command. The network is clearer if you use the iproute2 tools.
Joe
--
Joseph Mack PhD, High Performance Computing & Scientific Visualization
SAIC, Supporting the EPA Research Triangle Park, NC 919-541-0007
Federal Contact - John B. Smith 919-541-1087 - smith.johnb@xxxxxxx
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