External DNS reference in ACE

[Jack Dixon]

I have an External DNS: 12.53.18.186

I have IP (VIP): 10.35.153.69

How to configure ACE to reference this external DNS IP? (what are comds, or better still, URL reference.)

[Andrew Nam]

Hi Jack

Can you give more info about why you need to configure ACE to reference this external DNS IP?

regards

Andrew

[Jack Dixon]

Andrew,

Sure; below is the basic ACE lb template the program manager handed off to me:

=================================================================================

Complete Description of the Request: Implement Load Balancer on VLAN 401 in XYZ Dallas

App: Production Extranet Farm

Test/Prod: Production

IP (VIP): 10.35.153.69

DNS: bpnwww.mbco.com

External DNS: 12.53.18.186

Virtual Service Port: 80, 443, 4081

Real Server Name: mbsdalweb15, mbsdalweb23, mbsdalweb24, mbsdalweb25, mbsdalweb26, mbsdalweb27, mbsdalweb28

Real Server IP: 10.35.153.68, 10.35.153.55, 10.35.153.56, 10.35.153.57, 10.35.153.58, 10.35.153.59, 10.35.153.60,

Ports to be balanced: 80, 443, 4081

Load-Balancing Method: Least Connections

Persistence Method: Yes, timeout = 1260 seconds

Rules: None required.

Health Monitor: ICMP Ping to server

==============================================================================

Thanks for any assist you can give,

jack

[Andrew Nam]

Hi Jack

As per the basic ACE lb template the program manager handed off to you, you don't need to configure ACE to reference this external DNS IP.

Generally speaking, this DNS name resolution happens between client and DNS server before the tc connection request sneds out to the ACE.

Step 1. DNS name resolution between client and DNS server

Step 2. Once the client understand this domain name "bpnwww.mbco.com" resolves to 10.35.153.69, the client will  initate tcp connection to the resolved IP (in this case vip address defined on ACE).

Step 3. TCP 3 ways shandshake happens between the client and ACE.

so on.

I hope this answers your question.

regards

Andrew

[Jack Dixon]

Andrew,

Ok, thanks much for research and reply.

Regards,

Jack