Proxmox cannot ping a server in the network yet the rest of that network

Hello Experts,

There is a weird situation with proxmox.

I cannot ping from proxmox a server in the network yet the rest of network I can.

The actual virtual machine can ping the server.

The server we want to ping is the primary DNS server (if it makes a difference).

No idea where to begin troubleshooting.

marceloNYCMiddle-Tier AdministratorAsked:
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Since you did not give a lot of information for troubleshoot so this will be wide and general. :)
What to check:
IP address, subnet mask, default gateway on proxmox server

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marceloNYCMiddle-Tier AdministratorAuthor Commented:
Yes, you are right. I just started here and I am new to proxmox.

Let me keep digging any useful detail.
marceloNYCMiddle-Tier AdministratorAuthor Commented:
Well according to someone here.

He said that it will be helpful that the proxmox machines ping the multi-cast address:

proxmox-03:~# pvecm status
Version: 6.2.0
Config Version: 23
Cluster Name: smac-vm-clstr01
Cluster Id: 57065
Cluster Member: Yes
Cluster Generation: 37844
Membership state: Cluster-Member
Nodes: 2
Expected votes: 2
Total votes: 2
Node votes: 1
Quorum: 2  
Active subsystems: 5
Ports Bound: 0  
Node name: smac-proxmox-03
Node ID: 3
Multicast addresses: <--------- he is on that this needs pinging
Node addresses:
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