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Mattmans1's avatar
Mattmans1
Icon for Nimbostratus rankNimbostratus
Jun 30, 2020

Logging all VIP connections to syslog - Irule only?

Hi Guys,

 

I have around 35 VIP's setup on my LTM - i have a requirement to log the original Source IP of the requesting client to a syslog server so we can audit who has been accessing the servers by querying the syslog messages. If i take the LTM log file below, is all the connections to VIP's logged to this file by default? if so would it be the original src/dst or the src/dst after its been "Snat" and "Dnat" by the LTM?

 

**************************************************************************************************************************************************************

local traffic / The local traffic messages pertain specifically to the BIG-IP local traffic management events ./var/log/ltm

***************************************************************************************************************************************************************

 

I have been told you can only log traffic events to VIP's using an Irule but i'm not sure i this is true? can anyone clarify please?

 

BIG-IP
LTM
security
    • Mattmans1's avatar
      Mattmans1
      Icon for Nimbostratus rankNimbostratus
      Jul 02, 2020

      Hello Samir,

       

      Thankyou so much, just what i was looking for. Do you know if this is the same as configuring a HTTP profile? Would it do the same thing?

       

      Am i also right in thinking that if you had a custom VIP for a random SSH jump server that you would have to use an irule to log that since you cant use a HTTP profile?

  • Samir's avatar
    Samir
    Icon for MVP rankMVP
    Jul 03, 2020

    Above iRule will work for HTTP connection. If you wanted to capture all connection date then go with below irule.

    It will give complete picture

    when SERVER_CONNECTED {
  # This logs information about the TCP connections on *both* sides of the full proxy
  set client_remote "[IP::client_addr]:[TCP::client_port]"
  set client_local  "[IP::local_addr clientside]:[TCP::local_port clientside]"
  set server_local  "[IP::local_addr]:[TCP::local_port]"
  set server_remote "[IP::server_addr]:[TCP::server_port]"
  log local0. "Got connection: Client($client_remote)<->($client_local)LTM($server_local)<->($server_remote)Server"
}

    Output will be like below.

    <SERVER_CONNECTED>: Got connection: Client(101.3.3.20:33791)<->(10.2.4.111:80)LTM(10.1.1.110:33768)<->(10.3.5.200:8080)Server