Forum Discussion
NimbostratusPool Member server requesting to load balance back to itself
Hello,
I am in the process of using the f5 to load balance the EMC SourceOne application. It is using HTTPS, TCP ports 8001 and 8002. Currently only one member server is active in the pool and the member servers are using the f5 for the default gateway. There is no SNAT for client communications unless the client originated from the same subnet as the pool member server (iRule placed on virtual server).
The issue is that the member server performs a DNS lookup for the Web site which it is hosting. This DNS lookup returns the Virtual Server address of the f5 and the member server appears to try and make a connection to the f5 VS which then points back to itself. It is at this point that the member server RST this connection and the original client experiences an application error.
What we did to get around this was to put a local DNS host entry on the member server to point that web site to its own physical IP address. This seems to have fixed the problem.
Is there something that can be done on the f5 to resolve this?
Thanks for the assistance.
4 Replies
PeteWhiteEmployee
If you want to have a VS on the f5 which accepts this traffic and sends it back to the server then you can create a VS with a source of the app server and a pool of the app server. This will take precedence over the original VS.
Sounds like the local DNS entry fixed the issue though and is a much more graceful way of doing that.
- Kevin_Stewart
Concur with Pete. The answer probably lies in a local Hosts entry, or a split DNS configuration.
daemon8814_1288Did you ever get this working with SourceOne offline access? I am trying to load balance our SourceOne worker servers with our F5 LTMs but have been unsuccessful. As a test, I created the HTTP iApp, created the VIP on port 8001, and assigned just a single worker (we have 6 but using just one for now to test) on port 8001 to the pool. I then modified my local hosts file to point to the VIP for our alias s1work01 but when I try to connect via the offline plugin for Outlook, it just gets stuck at querying for the worker server. Also, keep in mind that I am very new to F5 so bear with me. Thanks.
- Kevin_Stewart
I believe the idea here wasn't to point to the VIP but to the host itself in the hosts file. You'd want the server to resolve its FQDN to itself directly so that it does not go through the VIP, otherwise you'd need to apply a SNAT.
