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anujg27_358584's avatar
anujg27_358584
Icon for Nimbostratus rankNimbostratus
Apr 15, 2018
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F5 Fundamental Lab-can't communicate between servers

Hi, I am currently following CBT Lab for F5 fundamentals(see attached 2 images) in which F5 imported and configured on Vmware workstation( Ver 13.x).The Internal subnet is 10.2.0.0/24 and Internal IP address on F5 is 10.2.0.145. My question relates to the INTERNAL section of the diagram where there are 3 web server nodes (10.2.0.11, 10.2.0.22 and 10.2.0.33) which I can't ping from F5. All three nodes can ping with each other. Also F5 internal side and all three web servers are all on Vmnet2.

 

I would appriciate if somebody can assist me as I have reached a road block.

 

Thanks

 

Anuj

 

application delivery
BIG-IP
devops
LTM
  • Learner_358934's avatar
    Learner_358934
    Apr 18, 2018

    Hi Anuj,

     

    To me, it looks like VMnet issue rather then the F5 issue. Try swapping VMnet2 with other interfaces.

     

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  • Davidfisher_345's avatar
    Davidfisher_345
    Icon for Altocumulus rankAltocumulus
    Apr 19, 2018

    hey man I had this same issue with this same lab.

     

    Here's the problem during my issue:

     

    ok so I finally got it.

     

    The default gw on the servers was set to 10.2.0.1 which is the ip for the vmnet2 and not the bigIP interface, which in turn was set to 10.2.0.145.

     

    So i set the gw to 10.2.0.145 and i get the webpages served all right.

     

    The tutorial caused this confusion, I should email keith barker!

     

    Get this checked.

     

  • AJ7's avatar
    AJ7
    Icon for Nimbostratus rankNimbostratus
    Jul 14, 2022

    Hello guys,

    I am facing the Same issue, I have tried all the suggestions but nothing is working for me.

    Also I checked the default route on these servers and seems okay.

     

    Please suggest.

    Below is the tcpdump out I can see. Same issue I am not able to ping these servers but able to ping with the servers.

    tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
    listening on any, link-type EN10MB (Ethernet), capture size 65535 bytes
    10:54:14.324368 ARP, Request who-has 10.2.0.11 tell 10.2.0.145, length 35 out slot1/tmm0 lis=
    10:54:15.325247 ARP, Request who-has 10.2.0.11 tell 10.2.0.145, length 35 out slot1/tmm0 lis=
    10:54:16.325754 ARP, Request who-has 10.2.0.11 tell 10.2.0.145, length 35 out slot1/tmm0 lis=
    10:54:17.326165 ARP, Request who-has 10.2.0.11 tell 10.2.0.145, length 35 out slot1/tmm0 lis=
    10:54:18.326456 ARP, Request who-has 10.2.0.11 tell 10.2.0.145, length 35 out slot1/tmm0 lis=
    10:54:19.326335 ARP, Request who-has 10.2.0.11 tell 10.2.0.145, length 35 out slot1/tmm0 lis=
    ^C
    6 packets captured
    6 packets received by filter
    0 packets dropped by kernel

     

    Thanks.

    • AJ7's avatar
      AJ7
      Icon for Nimbostratus rankNimbostratus
      Jul 14, 2022

      Also tried changing the VMNET's but still not working.