Gratuitous arp on startup

[lozley]

I am having a problem with gratuitous ARP. Basically, I have 2 servers which share the same IP address, only one of the servers interface is down. The problem is, when the server with the downed interface is rebooted, Solaris sends out a gratutious ARP, which updates all the network devices with the downed interfaces MAC address, which in turn causes traffic to goto the wrong server. Does anyone have any idea how to disable gratuitous ARPs during startup? The only way I have found to do it is to remove the hostname.interface file so that the interface is not plumbed at startup, but this then means the interface has to be manually plumbed & configured....

Any help appreciated!!

 

[Annihilannic]

I would try stepping through /etc/init.d/network somehow, maybe by adding sleeps and echos to try and figure out what step is generating the arps. Maybe while snooping the interface from another system.

It could be something like this line:

[tt]# Configure the rest of the IPv4 interfaces automatically, quietly.
/sbin/ifconfig -adD4 auto-revarp netmask + broadcast + up[/tt]

...which you probably don't need unless you use RARP to obtain IP addresses.

Annihilannic.

 

[mrn]

Take a look at this

http://www.opensolaris.org/os/community/networking/dad-design.pdf

Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."

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