Anycast DNS is inadvisable. DNS is specified to work on TCP, and Anycast
is unsuitable for TCP.
Those few who have been promoting the idea of anycast DNS were found to be
wrong in their assumptions. See previous discussion on the subject in the
archives.
--Dean
On Fri, 25 Mar 2005, jing shen wrote:
> Hi ��
>
> I'm trying to set up a anycast DNS server farm for customer service.
> In order to improve availability, we plan to install those servers in
> one LAN which has the similar structure like :
>
>
> server-(1,3)---switch1---router-1---(outside)
> |
> |
> server-(2,4)---switch2---router-2---(outside)
>
>
> The four unix servers are all unix boxes, switch-1 & switch-2 are
> interconnected to guarantee the availability. BIND is to be used as
> DNS cache server software, Quagga OSPFD is used to be routing
> software.
>
> According to above configuration, both routers will know multiple
> paths to dns cache server, while dns cache server should know two
> paths to outside network. Here comes my questions:
>
> 1) should each dns cache server be configured a static default route
> (0.0.0.0/0.0.0.0)? If server-(1,3) is configured statically to use
> router-1 as default router, will Quagga make it use router-2 when
> router-1 is not reachable?
>
> 2) If each server is configured two default router ( router-1 &
> router-2), or each server learn route 0.0.0.0/0.0.0.0 by OSPF ( our
> border router inject default route into OSPF ); there should be
> two equal cost path to 0.0.0.0/0.0.0.0 on each DNS server, the DNS
> server should disperse any outgoing packets onto the two paths, will
> that do harm to DNS service ?
>
> 3) Is there any requirement on BIND to fit to such multipath routing
> situation?
>
>
>
--
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