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shadow_82
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May 10, 2022

2x F5 VE in Azure doesn't ping each other

Hi!

I'm building a F5 cluster. 2 VMs, 3 interfaces:

  • MGMT,
  • External,
  • Internal (+ HA)

I Azure I have 3 VNets - according to needs

When I wanted to start forming a cluster, I noticed VMs does not ping each other on external nor internal interfaces.
Only MGMT (which currently are opened to connect from Internet - temporarily).

While this is internal subnet traffic, NSGs shouldn't be a problem. Yet - if it doesn't work, we added permit internal to internal on any port/proto. Nothing changed...

I have simple setup as it can be:

  • 10.0.3.10 - internal floating
  • 10.0.3.11 - internal bigip1
  • 10.0.3.12 - internal bigip2

BigIP1

BigIP2

bigip1 doesn't ping bigip2. Doesn't resolve ARP. I tried to add static ARP on both sides - didn't help...

[admin@bigip1:Active:Standalone] ~ # ping 10.0.3.10
PING 10.0.3.10 (10.0.3.10) 56(84) bytes of data.
64 bytes from 10.0.3.10: icmp_seq=1 ttl=255 time=0.733 ms
^C
--- 10.0.3.10 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.733/0.733/0.733/0.000 ms
[admin@bigip1:Active:Standalone] ~ # ping 10.0.3.11
PING 10.0.3.11 (10.0.3.11) 56(84) bytes of data.
64 bytes from 10.0.3.11: icmp_seq=1 ttl=64 time=0.042 ms
^C
--- 10.0.3.11 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.042/0.042/0.042/0.000 ms
[admin@bigip1:Active:Standalone] ~ # ping 10.0.3.12
PING 10.0.3.12 (10.0.3.12) 56(84) bytes of data.
^C
--- 10.0.3.12 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms

[admin@bigip1:Active:Standalone] ~ # arp -a | grep 10.0.3
? (10.0.3.10) at 00:0d:3a:2d:74:82 [ether] on internal
[admin@bigip1:Active:Standalone] ~ #

I even created similar setup in GNS3, which works perfectly, so I assume something is wrong on Azure side.
But after clearing out NSGs I'm confused what can it be...

Using Version 16.1.2.1

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