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Tag: network interface configuration

Moloch – Network interface configuration

Considering the possibility of packet loss at high traffic flows, it is recommended for the packet capture interface to NOT be the same as the interface connected to the internet, in this case, the interface assigned with static IP address. On the server in our lab there are two interfaces, one for packet capture and one for “outside” communication. To prevent packet loss, it is recommended to increase the Moloch-side interface’s buffer to maximum and turn off most of the NIC’s services by using the following commands:

ethtool –G enp0s9 rx 4096 tx 4096 
ethtool –K enp0s9 rx off tx off gs off tso off gso off 

You can find out the maximum buffer size using the ethool -g command, to check NIC’s services use the ethtool -k command. Disable most of NIC’s services, since you want to capture network traffic instead of what the OS can see they are not going to be used anyway.