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madhava's avatar
madhava
Icon for Altocumulus rankAltocumulus
Jun 21, 2023

Http server node receives partial http request big-ip load balancer

I am trying to setup BIG-IP load balancer first time, here is my setup. Client send traffic to virtual server and I have a node behind internal server. I am sending a simple get request to virtual s...
application delivery
devops
  • Mohamed_Ahmed_Kansoh's avatar
    Mohamed_Ahmed_Kansoh
    Jun 22, 2023

    Hi madhava , 

    I see in the Pcap that no completed flow between client side and server side , Bigip Resets the connection when seeing the HTTP GET request , I see also this GET request maybe truncated , something corrupted in this Request and not follow the standard of http. 

    Please test the below steps : 
    1) change the standard http Virtual server to >>> Performance layer 4 , you have to remove http profile prior to changing the virtual server type. 
    Performance layer 4 Virtual server  means that >>> Bigip will forward all requests ( somehow acts as a router ) Not http Checks.

    2) repeat the Tcpdump command that I sent in the first reply , and upload it. 

    Let us see what will be the behavior and decide what is the suitable workaround for your issue. 

    Look forward to hearning from you soon 🙂 

whisperer's avatar
whisperer
Icon for MVP rankMVP
Jun 22, 2023

So, you must have self IPs in VLAN used for Virtual Servers on the F5. Does the internal network have a route for this subnet pointing to the floating self IP on the F5? Sounds like the server is not routing the connection back via the F5. Could have async routing in play.