Determining active TCP connections via ELB logs





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I have an issue where my application crashes and it appears to correspond with an increase in Estimated Active Connections at my ELB. I've been digging through ELB logs and I'm having a hard time reconciling what I see in the logs vs. what the client is telling they are sending.



An example:



Client A (source IP 192.168.0.100) states they are "using 64 threads" to send simultaneous requests to my API, but when I check my ELB logs for a given hour, I only see 4-8 unique ports that appear with their source IP:



2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20635 10.65.65.1:80...

2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20647 10.65.65.1:80...

2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20649 10.65.65.1:80...

2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20638 10.65.65.1:80...

...

2018-11-10T12:00:43 MyLoadBalancer 192.168.0.100:20647 10.65.65.1:80...

2018-11-10T12:00:44 MyLoadBalancer 192.168.0.100:20635 10.65.65.1:80...


In contrast, Client B (source IP 172.16.0.100) appears in my ELB logs and it looks like they are opening 50+ TCP connections simultaneously:



2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36500 10.65.65.1:80...

2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36501 10.65.65.1:80...

2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36502 10.65.65.1:80...

2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36503 10.65.65.1:80...

....

2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36550 10.65.65.1:80...


Questions:




  1. If a client says they are using X number of threads in their client application when calling my API, should I expect to see around X unique port numbers at any given time in the ELB logs?

  2. Does 1 port number = 1 distinct TCP connection?

  3. Is it possible to limit a client from opening more than X connections simultaneously?


Thanks!






amazon-web-services networking tcp aws-elb







share|improve this question































    0















    I have an issue where my application crashes and it appears to correspond with an increase in Estimated Active Connections at my ELB. I've been digging through ELB logs and I'm having a hard time reconciling what I see in the logs vs. what the client is telling they are sending.



    An example:



    Client A (source IP 192.168.0.100) states they are "using 64 threads" to send simultaneous requests to my API, but when I check my ELB logs for a given hour, I only see 4-8 unique ports that appear with their source IP:



    2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20635 10.65.65.1:80...
    
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20647 10.65.65.1:80...
    
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20649 10.65.65.1:80...
    
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20638 10.65.65.1:80...
    
...
    
2018-11-10T12:00:43 MyLoadBalancer 192.168.0.100:20647 10.65.65.1:80...
    
2018-11-10T12:00:44 MyLoadBalancer 192.168.0.100:20635 10.65.65.1:80...


    In contrast, Client B (source IP 172.16.0.100) appears in my ELB logs and it looks like they are opening 50+ TCP connections simultaneously:



    2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36500 10.65.65.1:80...
    
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36501 10.65.65.1:80...
    
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36502 10.65.65.1:80...
    
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36503 10.65.65.1:80...
    
....
    
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36550 10.65.65.1:80...


    Questions:




    1. If a client says they are using X number of threads in their client application when calling my API, should I expect to see around X unique port numbers at any given time in the ELB logs?

    2. Does 1 port number = 1 distinct TCP connection?

    3. Is it possible to limit a client from opening more than X connections simultaneously?


    Thanks!






    amazon-web-services networking tcp aws-elb







    share|improve this question



























      0












      0








      0








      I have an issue where my application crashes and it appears to correspond with an increase in Estimated Active Connections at my ELB. I've been digging through ELB logs and I'm having a hard time reconciling what I see in the logs vs. what the client is telling they are sending.



      An example:



      Client A (source IP 192.168.0.100) states they are "using 64 threads" to send simultaneous requests to my API, but when I check my ELB logs for a given hour, I only see 4-8 unique ports that appear with their source IP:



      2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20635 10.65.65.1:80...
      
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20647 10.65.65.1:80...
      
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20649 10.65.65.1:80...
      
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20638 10.65.65.1:80...
      
...
      
2018-11-10T12:00:43 MyLoadBalancer 192.168.0.100:20647 10.65.65.1:80...
      
2018-11-10T12:00:44 MyLoadBalancer 192.168.0.100:20635 10.65.65.1:80...


      In contrast, Client B (source IP 172.16.0.100) appears in my ELB logs and it looks like they are opening 50+ TCP connections simultaneously:



      2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36500 10.65.65.1:80...
      
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36501 10.65.65.1:80...
      
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36502 10.65.65.1:80...
      
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36503 10.65.65.1:80...
      
....
      
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36550 10.65.65.1:80...


      Questions:




      1. If a client says they are using X number of threads in their client application when calling my API, should I expect to see around X unique port numbers at any given time in the ELB logs?

      2. Does 1 port number = 1 distinct TCP connection?

      3. Is it possible to limit a client from opening more than X connections simultaneously?


      Thanks!






      amazon-web-services networking tcp aws-elb







      share|improve this question
















      I have an issue where my application crashes and it appears to correspond with an increase in Estimated Active Connections at my ELB. I've been digging through ELB logs and I'm having a hard time reconciling what I see in the logs vs. what the client is telling they are sending.



      An example:



      Client A (source IP 192.168.0.100) states they are "using 64 threads" to send simultaneous requests to my API, but when I check my ELB logs for a given hour, I only see 4-8 unique ports that appear with their source IP:



      2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20635 10.65.65.1:80...
      
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20647 10.65.65.1:80...
      
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20649 10.65.65.1:80...
      
2018-11-10T12:00:42 MyLoadBalancer 192.168.0.100:20638 10.65.65.1:80...
      
...
      
2018-11-10T12:00:43 MyLoadBalancer 192.168.0.100:20647 10.65.65.1:80...
      
2018-11-10T12:00:44 MyLoadBalancer 192.168.0.100:20635 10.65.65.1:80...


      In contrast, Client B (source IP 172.16.0.100) appears in my ELB logs and it looks like they are opening 50+ TCP connections simultaneously:



      2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36500 10.65.65.1:80...
      
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36501 10.65.65.1:80...
      
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36502 10.65.65.1:80...
      
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36503 10.65.65.1:80...
      
....
      
2018-11-10T12:00:43 MyLoadBalancer 172.16.0.100:36550 10.65.65.1:80...


      Questions:




      1. If a client says they are using X number of threads in their client application when calling my API, should I expect to see around X unique port numbers at any given time in the ELB logs?

      2. Does 1 port number = 1 distinct TCP connection?

      3. Is it possible to limit a client from opening more than X connections simultaneously?


      Thanks!






      amazon-web-services networking tcp aws-elb




      amazon-web-services networking tcp aws-elb






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      edited Nov 24 '18 at 15:02







      suspicious_williams

















      asked Nov 24 '18 at 12:22









      suspicious_williamssuspicious_williams

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