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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
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  • 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 🙂 

Mohamed_Ahmed_Kansoh's avatar
Mohamed_Ahmed_Kansoh
Icon for MVP rankMVP

Hi madhava , 
First,  I'm reviewing with you your flow and Ips , So Am I correct in the below diagram according your configuration and design : 



Please confirm : Do you use SNAT Automap feature or not in Virtual server properities , you must configure it !

2nd ) 
I need you to execute only one TCPdump command to capture the Client and server sides traffic at the same time and to make it clear to follow the http and tcp stream well. 
use the below command : 

tcpdump -nni 0.0:nnnp -s0 -c 100000 -w /var/tmp/capture.pcap host 172.16.0.2

#where 172.16.0.2 is the IP of your machine or your client ip address.

using this command will capture all needed information in both sides ( Client & server side ) 
Please attach it in your reply to have a look on. 

Looking forward to hearning from you soon.