[quagga-users 14433] Re: Redundant Service IP on loopback

sthaug at nethelp.no sthaug at nethelp.no
Tue Sep 27 06:56:53 BST 2016


> The article I found described how to set up the IP for some service 
> (i.e. DNS) on the loopback interface of two identical servers and then 
> use BGP to distribute route advertisements with different metrics such 
> that if the server with the lower metric fails or is rebooted the 
> traffic will go to the other server.
> 
> My main goal here is services such as DNS and LDAP were the service is 
> primarily used by other hosts/servers on the same subnet.  I'm not sure 
> if the original scheme (above) assumed that there was a router involved, 
> but in this case there is no router.
> 
> Any guidance would be sincerely appreciated.

This is standard anycast, used on *lots* of DNS servers on the Internet
today. See for instance

       https://www.nanog.org/meetings/nanog29/presentations/miller.pdf

Easy to configure, works great. No magic.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no



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