Network Issue: fresh proxmox 4.1 installation no network access

[Kaya]

Hi everyone.
Strange issue today.
I installed a fresh proxmox 4.1 on tower pc for testing purpouse and i can't figure out why network doesn't work.

The network interface is correctly enabled and led blink in the right manner.
If i try to ping a device it doesn't work.
If i try to put the eth0 interface as dhcp client, proxmox grab correctly the ip, subnet, gateway and dns. But still doesn't work or ping.

I'm guessing that there's something like a firewall even if pve-firewall is in disabled state.
Doing a tcpdum reveal that a lot of packet ar dropped by the kernel, so I think that there's something that block ip traffic.
What can I do to understand what's happening?

Thanks in advice

 

[mmenaz]

Just a shot in the dark... You could have driver issues, and packets are dropped because "malformed", try with a different ethernet nic (i.e. Intel chipset brand). Check also the cable (replace it) and try a direct connection with a PC so you can exclude switch issues or configurations. Have a look also at the "douplex" and "auto negotiate" stuff (don't remember if ethtool and mii-tool are installed by default).
With default installation firewall is not enabled, in any case check with iptables -L

 

[Kaya]

Adding one more information.
The place where Proxmox had to be placed is in a 172.24.25.0/24 subnet.
If I put vmbr0 to get an IP according to that subnet, it didn't work.
Otherwise, if I use an IP like 192.168.25.10, it work.

The VM inside, who has 172.24.25.3 IP, work without problem.
I cant't figure out what's happening..