LBM for internal vlans,

Thanks for your reply, but it's still not fixed.

Try doing a tcpdump on your BIG-IP to see what communications are going between it and the servers: tcpdump -nni 0.0 host 10.10.10.10 or host 10.10.10.11

Under System>Console, i ran the command, i got the message below BIGpipe parsing error: 012e0008:3: The requested command (tcpdump -nni 0.0 host 10.10.10.11) is invalid

You'll need to do this from CLI, in the bash shell. To get to bash from TMSH, type 'run util bash'

Is the System>Console is the CLI ? The console is the only option where we can type the commands in.

You should be able to SSH to the BIG-IP using Putty or some other SSH client.

This is my version BIG-IP 9.4.5 Build 1049.80 Final. Sorry i am still finding how to open the bash shell and TMSH

Now I can have the tcpdump on host 10.10.10.10 and .11, what would we expect to see ?

You are looking for two way traffic between the BIG-IP and your two servers. Look to see if a three-way handshake is completing (SYN, SYN ACK, ACK). Feel free to post the tcpdump results here for us to take a look at. Though if there are sensitive IP addresses used, you might want to sanitize those before posting.

Okay, so your BIG-IP (10.10.10.13) is attempting to contact the server (10.10.10.10) on port 80. You can see the SYN packets leaving the BIG-IP on vlan 300, but no SYN ACK ever comes back from the server. ARP is working, so layer 2 looks to be good. Is there a firewall or some other device that could be blocking the packets from getting to your 10.10.10.10 server?