How TCP connection is handled by ACE

[Jan Rolny]

Hi all,

I have simple question to ensure if I think that properly.

Here is this situation :

client----ACE----server1

                   \--server2

When client initiate TCP connection it starts standard 3-way handshake so it send SYN to ACE(VIP of serverfarm) first.

Question is, will ACE forward this SYN to server immediately or ACE will wait also for data from client?

I think that it pass through ACE to server. Server respond with SYN/ACK and client answer ACK back to server. After that data are sent.

Is it correct?

And 2nd question what if server send FIN+ACK and client sends RST. Will ACE reset the rest of this connection?

I appreciate your answers.

Jan

[Kanwaljeet Singh · Accepted solution]

Hi Jan,

If it is a L4 connection then yes ACE will forward SYN immediately and if it is L7 then there will be delayed binding meaning there will be a separate front end and back end connection as ACE needs to wait for L7 information to take a LB decision.

If client sends the RST then yes the connection would be closed.

Regards,

Kanwal

[Jan Rolny]

Hi Kanwal,

thanks for quick response.

Just another question. So in case of L7 connection between ACE and server, source IP will ACE IP not client IP. Correct?

Regards,

Jan

[Kanwaljeet Singh]

Hi Jan,

If you are using source natting then yes otherwise client IP would be used.

Regards,

Kanwal