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Hello

Here is the situation :
- VMplayer with 2 physical NICs (network interface cards) on the Windows host
- VM Debian 64bits
- On VM settings: both NICs are configured to replicate on the physical network
- When VM Debian is running, I declared 2 NICs :

ETH0 : 0.0.0.0 (dedicated to snort)
ETH1 : 172.22.0.12 set on dhcp (internet)

ETH0 is up and in promiscuous mode to receive mirroring flow from a switch
ETH1 is using to go to internet

I have some update scripts that must download some data from internet.
They cannot access the network, even if /etc/resolv.conf is well configured.

Depending tests that I did :
Or I can go to the net, but no capture on snort that listens eth0
Or I cannot go to the internet and snort capture eth0

What is(are) the configuration you think ?

I wish :

ETH0 : 0.0.0.0 : capture the traffic that arriving
ETH1 : dhcp : go to the internet from kernel (root) login for my scripts

Thanks for your help

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You need to make sure the default route is via the eth1 interface. For example:

route del default
route add default eth1

That will delete the existing default route (if any) and add a new default route via eth1.

You could add those as post-up commands to the definition of eth1 in /etc/network/interfaces. e.g.

iface eth1 inet dhcp
post-up route del default || true
post-up route add default eth1

The || true ensures that the route del default never returns a failure exit code, even if there is no default route to delete. Without that, ifup could abort before running the route add default eth1 command.

-1

The problem came because VMPlayer needs to have a bridge nic and a nat bridge. After this, linux configuration interfaces are as usual.

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