-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 11/21/11 10:52, Pandu Poluan wrote: > Hello all, I'm in need of some suggestions. > > You see, I have 2 Internet connections with public IP addresses, let's > say ISP A 11.22.33.44 and ISP B 22.33.44.66 > > Now, I want outside parties trying to connect to "target.example.com" > by default resolves to 11.22.33.44, but if ISP A's connection goes > down for any reason, the DNS server will instead return "22.33.44.66". > > The nameserver itself will be located in the company, accessible from > the world via "ns1.example.com" = 11.22.33.44:53 or "ns2.example.com" > = 22.33.44.66:53. This allows the nameserver to monitor the state of > the connections to ISP A and ISP B. > > I've been perusing pages discussing BIND, and came to the conclusion > that BIND is incapable of doing that. > > Anyone can recommend me a DNS server that has such capability? Or how > to implement this ability with maybe Python or (*shivers*) Perl? > > Rgds,
Hello, you could use another way, by switching the IP address of the DNS server with Heartbeat acordingly. Say you have a server with IP A and another with IP B. You can tell heartbeat to switch an IP C as second IP between these servers. So if Server 1 ist master, it has IP A and C. If it goes down, Server 2 will bring IP C up and become master. IP C will be you ns dns record obviously. You can avoid splitbrains when a network component between these machines goes down by wiering them crossover on a second NIC. Even saver would be a STONITH device, which kills the whole machine if one of the servers is reachable and answers to ping but is doing crap. A client side way would be a resolve.conf looking like this: nameserver 11.22.33.44 nameserver 22.33.44.66 options timeout:1 search your.domain regards, Norman -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJOyz4BAAoJEMCA6frkLT6zcGMH/RhfutaeDKtelQsRotGDfEjb z9dWgWJs+YBC4P16AGw9ZGEQ8b1zOjhnj4mjjkCPQohik0A4tCLHqUX0tC2QeJSN 4fErfaqInOqqPHmcvEOYBREG09dC0VoqGC9MjzvOKn2yYUbaBdt8Foc8o6DHICKi rZMl2KGWIUUSv4/uhbaqpd3mEceqGB33XjssvYDis1douPz4TgZTexYlC/gX+OtF l8eUDdEWy6ks+BM712CLqWAp45zgv3QPQvNQiPyOUU++LQ7vW5FLmlz6fHl9xUtw SjqUC+9Ry17VdSTBSMtmiTZjaXoR2LFZPiVvFnIKYKvJE/Fa3sDMtLFQTF1u0SE= =dKBC -----END PGP SIGNATURE-----
