Forum Discussion

TFleming's avatar
TFleming
Icon for Nimbostratus rankNimbostratus
Apr 17, 2020

Find connection attempts via source IP

Hey guys, I'm fairly new to F5. We have one configured before I started working here. We have a windows terminal server virtual server in our F5 that load balances between 18 different back end termi...
application delivery
BIG-IP
devops
TMSH
  • Beaker's avatar
    Beaker
    Apr 20, 2020
    when CLIENT_ACCEPTED {
  set LogString "Client [IP::client_addr]"
  log local0. "==== $LogString (request) ====="
}
 
when SERVER_CONNECTED {
  log local0. "==== $LogString (server connected) - server: [LB::server addr]:[LB::server port] ===="
}

    I have tested that this works

TFleming's avatar
TFleming
Icon for Nimbostratus rankNimbostratus

Great thank you! One quick question because I don't want to make any assumptions, will this cause an outage of any kind? Will I need to restart anything to have he iRule work?

Beaker's avatar
Beaker
Icon for Cirrus rankCirrus
Apr 17, 2020

This should no impact on actual traffic as all that is happening is the F5 is logging details of the connection. Depending on the traffic load it could lead to a lot of entries in the ltm log but that is why it is recommended for troubleshooting not permanent use.