I am doing DR and the ARP problem makes sense. The part I still don't understand is "I need a public and private VIP." The ISP I am using has assigned me some IP addresses. I know how to use ifconfig to put multiple addresses on an interface, that is no big deal, but what I can't figure out is how to decide what IP address to use for the VIP. I have looked up VIP and found many explanations, including ones that tie it to lo, ones that say that it does not need to be tied to an interface (and I don't know how to do that). Unless it is one of the ones my ISP lets me use, then no one can get to me from the outside. I need to both configure the machine and use it from outside the data center. I have an IP address that I go into with ssh. If that is my RIP, then what address should my VIP be? Should I request an address from my ISP that I can use for the VIP and configure it on eth0? Do I get an address from the ISP and have them configure the router so people can get to it?
-Don > Hi, > > On Tue, 2009-05-19 at 23:27 -0700, Don Steiny wrote: > >> I found this recent and comprehensive documentation that is missing one >> important thing. It tells that we need add a VIP, but to what? I have >> machines that have 2 ethernet cards. On are on an internal subnet >> 172.21.4.32 and so on, and the others go though the router to the >> outside: 66.124.8.1 and so on. When it says "set up a VIP" and that it >> can be "pinged from the outside" I am totally lost. Do I do an ifconfig >> on eth0:1 or something like that? What ip address should I use? If I >> make it part of the internal network, then I can't get to it from the >> outside, if I make it part of the external, then the machines inside >> can't see it. HELP!! >> > > Think logically: if you need a VIP that can be reached from 'outside', > it must be a public address, right? Also you don't mention which method > of LVS you're going to use. > > Anyway, you'll need a public VIP and an internal VIP in the case of NAT: > > [client] -> [director] -> [realserver] -> [director] -> [client] > > And set the default gateway of your realserver to point to the internal > VIP on the director to guarantee the packets travels back through the > director to the client. > > If you use DR you'll need only a public VIP: > > [client] -> [director] -> [realserver] -> [client] > > The default gateway on the realserver can be set to its 'normal' value. > > Btw, all this is documented in the (mini-)HOWTO. There are even > ready-to-run examples of DR/NAT that you can modify. I suggest you > really read the HOWTO again because if this boggles you, you're in for a > treat when it comes to the ARP problem ;) > > Good luck > > _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - [email protected] Send requests to [email protected] or go to http://lists.graemef.net/mailman/listinfo/lvs-users
