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Having a second card has one major benefit. Failover.
If the first card dies, I have keepalived watching waiting with a script.
In this case the second card gets reset to having the RIP on hme1 and VIP
on l1:1. As well, we have seen lo:1 arp out somehow (really weird) on
hme0 which of course caused chaos at the routers and the directors.
That's where paranoia kicks in, and having the card for failover anyways
makes it an 'attractive' solution. Note that no arps have occured on hme1
- VIP setup.
Ramon Kagan
York University, Computing and Network Services
Unix Team - Intermediate System Administrator
(416)736-2100 #20263
rkagan@xxxxxxxx
On Tue, 11 Jun 2002, Roberto Nibali wrote:
> Hello,
>
> >>What does hme1 vs. lo0:1 have to do with paranoia?
>
> Question remains ;)
>
> >>>ifconfig <intfc> plumb
> >>>ifconfig <intfc> <VIP>
> >>>ifconfig <intfc> <VIP> <VIP>
> >>
> >> ^^^^^
> >
> >
> > Sure it can! This is a pointtopoint setup
> > And if it can't work then why is my setup working?
>
> Ok, I stand corrected. I've read the solaris ifconfig man page now. I'm
> still a bit confused as to why you set up a p2p with srcIP==destIP==VIP
> or did I even misread the man page? And why do you need the two steps:
>
> ifconfig <intfc> <VIP>
> ifconfig <intfc> <VIP> <VIP>
>
> >>>ifconfig <intfc> netmask 255.255.255.255
> >>>ifconfig <intfc> up
> >>
> >>s/up/-arp up/
> >
> > no need to, this is on a card that isn't connected to the network
> > it wouldn't hurt, but it doesn't matter
>
> Ok, I see. So why did you put <intfc> when you meant hme1? And besides
> that when I used to work with SUN hardware it wouldn't ship with more
> than one NIC. And buying a second NIC simply to be there for the VIP is
> bloody expensive. But I reckon if you can afford decent SUN hardware you
> might as well buy a second NIC.
>
> > The LVS FAQs in the how-to docs.
>
> Man, this was definitely not my best day. I'm sorry, you're right. Best
> regards,
>
> Roberto Nibali, ratz
> --
> echo '[q]sa[ln0=aln256%Pln256/snlbx]sb3135071790101768542287578439snlbxq'|dc
>
>
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