Vrrp/CARP/ucarp Problems

[Jordan Gordeev]

The only load balancing that CARP supports, to my knowledge, is ARP 
level load balancing. From carp(4):
The ARP load balancing has some limitations.  First, ARP balancing only
     works on the local network segment.  It cannot balance traffic that
     crosses a router, because the router itself will always be balanced to
     the same virtual host.
Ross Draper wrote:

> Hi
>  
> Firstly, many thanks to Stefan (who provided me a diff of the CURRENT 
> update) and Bruce for advising me that the "multiple CARP interface 
> destroy" bug is fixed in CURRENT.
>  
> Jordan, thanks for your reply, but I cant find a reference to CARP 
> being unsuitable for this purpose in the CARP man page, have I perhaps 
> misunderstood you?  I also did a quick search of the freebsd.org site 
> and cant find any mention of it being an issue - If you could provide 
> me with a link I'd be grateful.
>  
> Further to this, I have been in the office today performing local 
> testing as opposed to remote testing and have noticed that when both 
> machines in the cluster are using xl network cards, failover etc seems 
> fine.  However, when having one node using xl and the other using 
> em/bge I can see the em or bge card physically go down after it 
> reverts to backup mode, then come back up and goto master. (this wasnt 
> displaying in the messages log, but was obvious on the console).  I 
> believe that this down period is sufficient for it to miss the 
> remaining advertisements and believe it is the master again.  For some 
> reason it doesnt seem to ever remove the mac address or recover after 
> this point, but I'm not particularly suprised.  Not sure how to take 
> this further, but I'll continue fiddling.
>  
> Many thanks
>  
> Ross
>  
>  
>  
>
>
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