| Description | This article provides a solution to a case of slow download speed on clients behind a FortiGate VM that is running on ProxMox VE (Virtual Environment) with Broadcom BCM57502 NICs. |
| Scope | FortiGate, ProxMox. |
| Solution |
Some Dedicated Servers equipped with Broadcom BCM57502 NICs may experience really slow download speeds inside VMs or containers running on Proxmox VE (Virtual Environment). To resolve this the generic-receive-offload on the actual interface of the server, where Proxmox bridges, must be disabled
How to disable and make the change permanent:
SSH to the server and list all PCI devices with this command:
lspci -nnd ::200
For example:
If the PCI ID is [14e4:1752], the server is affected.
List the network interfaces with:
ip -brief link show
For example:
To find which interface corresponds to the Broadcom controller, run the following:
ethtool -i eno1
For example:
Now that the interface is identified, the 'generic-receive-offload' parameter needs to be disabled. To check if 'generic-receive-offload' is enabled and disable it, use these commands:
ethtool --show-offload eno1 | grep generic-receive-offload ethtool --offload eno1 generic-receive-offload off
Finally, to make the change permanent, the /etc/network/interfaces file needs to be modified and the network service needs a restart:
Service restart:
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