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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Regards
Jing Shen
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