The main question is the following: Where are the clients of your server located? If all the clients are on the internal network (i.e. you server does not contain any zones, which sould be visible from the Internet) you could use one network card and connect it to the internal network. If your server contain zones which should be visible from the Internet, you should use two NICs and connect it both to the internal network and to the router (with the real address on that NIC), because it should be accessible from the Internet, and, therefore should have the real IP address and be accesible even in the case of primary DNS server failure - therefore it should have connection between itself and its clients which should not go through the primary DNS machine.
The switchover between servers will be authomatic, if you will include the secondary server everywhere in the configuration in the same way as primary - in the configuration of clients and in the parent DNS zone (in the NS record of your zone). Alexey Fadyushin. Brainbench MVP for Linux. http://www.brainbench.com santosh kumar wrote: > > As per current existing LAN architecutre I have different kind of > setup. The DNS server itself is acting as gateway with private IP and > its connected to router with public IP (like mediator bet LAN and > Router). So to access the internet first client will hit the DNS server > and then go through router. I want to configure a sec DNS that in case > of problem with primary DNS I can avoid down time. Is sec DNS will > switch over automatically or else I need to promote manually to primary > DNS. Now tell me as per existing setup shall I need to install sec DNS > with dual NIC cards...??? And How to tech disaster recovery??? > If you specify some steps it would be great helpful.. > > Thanks & Regds, > santosh > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Alexey Fadyushin > Sent: Monday, March 31, 2003 3:36 PM > To: [EMAIL PROTECTED] > Subject: Re: Secondary DNS > > You do not need two NICs in the secondary DNS. However, you secondary > DNS server should be accessible in the case of primary DNS failure. For > example, if you will place your primary DNS on the router, which connect > your secondary DNS server to Internet (I think that you use such a > configuration because you have two NICs in the primary DNS), and that > router fails, you will not have access from the Internet to your > secondary DNS server and you will not have disaster recovery capability > for the clients from the Internet. > > You should list yor secondary DNS server in the NS record for the zone > which it will serve in the same way as you did for primary DNS. Clients > will use both NS records for primary and secondary DNS servers. > Therefore, as long as both servers work each of then will serve one half > of client requests, and when one of them fails all requests will be > addressed to the working server. > > Of course, it is the description of the typical situation. If you have > some unusual network configuration or requirements, the DNS > configuration could be more complex. > > Alexey Fadyushin. > Brainbench MVP for Linux. > http://www.brainbench.com > > santosh kumar wrote: > > > > Hi everyone, > > > > Have small doubt about secondary DNS. I have a primary DNS server > > with redhat 7.2 which is configured with 2 NICs, one for public IP & > > other for local IP. My doubt is to configure secondary DNS shall I > > need again 2 NIC cards & how to promote a secondary DNS in case of > > Primary DNS down I want to configure Secondary DNS & test it for > > disaster recovery, so I can avoid down time in case of problem with > > Primary DNS server... Desperately waiting for all guru's answers... > > > > Thanks & Regards, > > santosh > > ph : 080-5273061,5202417 > > > > -- > > redhat-list mailing list > > unsubscribe mailto:[EMAIL PROTECTED] > > https://listman.redhat.com/mailman/listinfo/redhat-list > > -- > redhat-list mailing list > unsubscribe mailto:[EMAIL PROTECTED] > https://listman.redhat.com/mailman/listinfo/redhat-list > > -- > redhat-list mailing list > unsubscribe mailto:[EMAIL PROTECTED] > https://listman.redhat.com/mailman/listinfo/redhat-list -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://listman.redhat.com/mailman/listinfo/redhat-list
