Forum Discussion
Mia_254836
Nimbostratus
NimbostratusAbout reusing the IP and ports deleted in the connection table
Hi Experts,
The BIG-IP will delete the connection by connection idle timeout or RST from the client or the server. Thus, after BIG-IP delete the relevant connection in the connection table. I wan wondering whether the BIG-IP use immediately the IP and port deleted in the connection table.
For example,
- BIG-IP establish a connection with 1.1.1.1:10000 -> 2.2.2.2:80
- After idle timeout, BIG-IP delete the above connection.
- If the new SYN with the source(1.1.1.1:10000) and the destination(2.2.2.2:80) is arrived immediately to the BIG-IP, I was wondering whether the BIG-IP create a connection(1.1.1.1:10000 -> 2.2.2.2:80) and establish or not.
Thank you. Mia
2 Replies
pete_71470Cirrostratus
F5 developers can answer precisely but I can tell you from personal experience that 3 in your example does not happen. The IP:port on source can't be reused until twice the maximum segment lifetime -- even then it appears F5 cycles through least recently used ephemerals per source IP first.- Chris_Grant
Employee
If the connection is not in our connection table, then yes we will initiate a new connection when receiving a SYN.
