Forum Discussion
NimbostratusDoes a Node have to be part of a pool?
We have an 2200 LTM. Not certain of the version, but it should up to date, or close to it.
Do you have to have a node part of a pool?
Thanks in advance.
Judy
6 Replies
- JRahm
Admin
A pool is made up of one or more IP:port definitions of server addresses. A node is just the IP, which can potentially service multiple services. Can you clarify what you are trying to accomplish? 
gothicreader_23We have a web server that I have set up as a node, and assigned a health monitor for https. However, we're unable to reach the server from the external network. I can ping the server from the load balancers. We have other configured VIPs and POOLs with nodes that are working perfectly fine. My logic tells me that I don't need a pool for only one web server?
I hope this helps.
Thanks, Judy
natheCirrocumulus
You still need the concept of a pool, even if there is only 1 pool member (the web server). As Jason mentioned, a node is just an IP, when you add a node to a Pool to become a pool member you assign it a port, such as port 80.
- gothicreader_23
I went ahead and created a pool and added the node to the pool. I also created a health monitor for port 443 and associated the health monitor to the pool. When I do a packet capture from my workstation to the web server, I see a lot of TCP retransmissions, until the page times out. On the web server running tomcat, I don't see in the log file any connection, nor when I do a netstat of my workstation.
Just want to point out that we have other web servers setup in the same network in different pools/VIPs without this problem.
I'm stumped as to what the problem might be or what I'm doing wrong. Thanks, Judy
Amine_KadimiMVP
Unless your F5 is the default gateway of your backend servers and in case you didn't configure source translation already, you'll need to go into the virtual server settings and set the value of "source address translation" to "automap".- gothicreader_23Bingo!!! The automap was not selected and after selecting I was able to reach the web server. Thank you all for your help.
