[quagga-users 14434] Re: Redundant Service IP on loopback

Alexis Rosen quagga-users at alexis.users.panix.com
Tue Sep 27 11:35:39 BST 2016


On Sep 27, 2016, at 1:56 AM, sthaug at nethelp.no wrote:
>> 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.

Also, not a good solution, if I'm reading the OP right. This seems like exactly the situation VRRP (HSRP) was invented for.

/a


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