Forum Discussion
Ernesto_M
Nimbostratus
NimbostratusResolve 2 IPs at the same time, with failover in a 3rd one
In BIG-IP GSLB, I want to resolve a domain, for example, www.example.com, with 2 IPs at the same time (1.1.1.1, 2.2.2.2), and when these 2 IPs are down, resolve with a third IP (3.3.3.3). For example, in a nslookup this is what I want:
> nslookup www.example.com
Servidor: dns.google
Address: 8.8.8.8
Respuesta no autoritativa:
Nombre: www.example.com
Addresses: 1.1.1.1
2.2.2.2
I achieved something similar using Wide IP, where I created 3 pools (1 per IP), the 2 main IPs are balancing in Round Robin and the 3rd IP is used as Last Resort Pool, the issue is that the 2 main IPs aren’t resolving at the same time, they’re balancing correclty, but no resolving at the same time, only one per nslookup request.
Another test I did was using Return to DNS as main action in pools (with previous Zone Records configuration), here I can resolve both IPs, but failover with 3rd IP doesn’t work.
Do you know what can I do to accomplish this?
Hello,
My understand, in your scenario you can run with a single pool and a fallback IP:
To get multiple answers, change the "Maximum Answers Returned" on pool properties.
E.g.
WideIP: www.my.domain
Pools: Pool_A
Last Resort Pool: None
Pool_A:
Properties:
Maximum Answers Returned: 2
Members:
1.1.1.1
2.2.2.2
Load Balancing Method:
Preferred: RR
Alternate: RR
Fallback: Fallback IP
Fallback IP: 3.3.3.3
If you need to work with a last resort pool setup, you can:
WideIP: www.my.domain
Pools: Pool_A
Last Resort Pool: Pool_B
Pool_A:
Maximum Answers Returned: 2
Members:
1.1.1.1
2.2.2.2
Load Balancing Method:
Preferred: RR
Alternate: RR
Fallback: None
Fallback IP: 0.0.0.0
Pool_B:
Members:
3.3.3.3
.........
I hope this helps.
Best Regards
cjuniorNacreous
Hello,
My understand, in your scenario you can run with a single pool and a fallback IP:
To get multiple answers, change the "Maximum Answers Returned" on pool properties.
E.g.
WideIP: www.my.domain
Pools: Pool_A
Last Resort Pool: None
Pool_A:
Properties:
Maximum Answers Returned: 2
Members:
1.1.1.1
2.2.2.2
Load Balancing Method:
Preferred: RR
Alternate: RR
Fallback: Fallback IP
Fallback IP: 3.3.3.3
If you need to work with a last resort pool setup, you can:
WideIP: www.my.domain
Pools: Pool_A
Last Resort Pool: Pool_B
Pool_A:
Maximum Answers Returned: 2
Members:
1.1.1.1
2.2.2.2
Load Balancing Method:
Preferred: RR
Alternate: RR
Fallback: None
Fallback IP: 0.0.0.0
Pool_B:
Members:
3.3.3.3
.........
I hope this helps.
Best Regards
Ernesto_MHello cjunior,
This worked for me, thank you very much!