i am running knoppix 3.7 on two boxes and i have the same issue
i have two network interfaces eth0 and eth1
eth1 is the usb modem to internet
eth0 is network card to local network
every time i boot up i watch the screen info fly by and i can see the network interfaces being brought up and then back grounding?
when i log in and ifconfig all the interfaces are up and running (even control centre agrees) but if i ping a web address nothing happens
i have to go to netcardconfig and re set the eth1 interface (this often causes eth0 to fall out of bed so i have to restart that again)
i run a web server and this is a real pain in the but
can someone help
i am fairly ok with command line work if needed
m

TP-Link TL-SG105 5-Port Gigabit Ethernet Unmanaged Metal Desktop Network Switch
$19.99
TP-Link TL-SG1048 48-Port Gigabit Rackmount Switch New Factory Sealed
$199.99
NETGEAR GS308EP Essential Series 8-Port Gigabit PoE+ Unmanaged Switch
$49.99
Cisco Catalyst 2960-48TT-L 48-Port Fast Ethernet Managed Rackmount Switch
$46.99
5 Port Gigabit Unmanaged Ethernet Switch, Home Network Hub, Office Ethernet S...
$9.64
10-Port Gigabit PoE Network Switch with 8 PoE+ Ports with 2 Combo SFP Slots 125W
$39.99
TP-Link TL-SG2210P 10-Port Gigabit Smart Switch w/ 8-Port PoE+ NO AC SKU 25597
$36.98
Arista DCS-7010T-48-R 48P 1GbE 4P 10GbE SFP+ RA Switch with rack mounts
$69.00
Linksys LGS328MPC 24-Port Managed Gigabit PoE+ Switch with 4 10G SFP+ Uplinks
$224.95
Cisco WS-C3650-12X48UR-L 48-Port Stackable Layer 3 8x10G SFP+ Port Switch
$129.99