use two separate internet connections

eantoranz · 05-31-2005, 11:53 AM

I have two different internet connections attached to a linux box.

I have already set their bandwiths with a tbf qdisc (they have a different bandwith).

Is there a simple way I can force the linux box to use both connections? (the simpler, the better, I guess. It's no flashy stuff).

I'm trying following "Linux Advanced Routing & Traffic Control HOWTO", but haven't been able to get them to work. It fails on the very last command to "blend" them (http://lartc.org/howto/lartc.rpdb.multiple-links.html):

Code:

# ip route add default scope global nexthop via 201.249.120.1 dev eth1 weight 1 nexthop via 201.249.112.1 dev eth2 weight 1
RTNETLINK answers: Invalid argument

Configuration of routes and links (eth0 is the lan connection. eth1 and eth2 are the two separate internet connections).

Code:

# ip link show
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:0f:fe:02:ec:d8 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc tbf qlen 1000
    link/ether 00:60:08:18:4b:4c brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc tbf qlen 1000
    link/ether 00:50:da:b7:40:6f brd ff:ff:ff:ff:ff:ff

# ip address show
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:0f:fe:02:ec:d8 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.47/24 brd 192.168.0.255 scope global eth0
3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc tbf qlen 1000
    link/ether 00:60:08:18:4b:4c brd ff:ff:ff:ff:ff:ff
    inet 201.249.122.247/21 brd 201.249.127.255 scope global eth1
4: eth2: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc tbf qlen 1000
    link/ether 00:50:da:b7:40:6f brd ff:ff:ff:ff:ff:ff
    inet 201.249.114.10/21 brd 201.249.119.255 scope global eth2

# ip route show
201.249.120.0 dev eth1  scope link  src 201.249.122.247
201.249.112.0 dev eth2  scope link  src 201.249.114.10
192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.47
201.249.120.0/21 dev eth1  proto kernel  scope link  src 201.249.122.247
201.249.112.0/21 dev eth2  proto kernel  scope link  src 201.249.114.10
default via 201.249.112.1 dev eth2
default via 201.249.120.1 dev eth1

Ideas?

bramhastra · 06-01-2005, 05:04 AM

what I can get from your first quote is that you have a load balancing issue. Try to have a check on that

eantoranz · 06-01-2005, 08:34 AM

I made a very implrtant discovery:

Without CONFIG_IP_ROUTE_MULTIPATH support by the kernel, that command I used WON'T work.

I tried on my mdk box (which has the support) and it worked.

zamri · 08-19-2005, 11:24 AM

thanks!. I need to know this. but how in the world can I know from stock Mandrake 10 distro kernel whether it has support for MULTIPATH ROUTING? /proc/* ? the kernel is 2.6.3

eantoranz · 08-26-2005, 08:26 PM

It does:

Code:

# grep ROUTE_MULTIPATH /boot/config-2.6.3-7mdk
CONFIG_IP_ROUTE_MULTIPATH=y

zamri · 09-01-2005, 05:05 AM

Ok. thanks. that'll be great.

pxumsgdxpcvjm · 12-06-2005, 07:19 AM

I faced the same problem
the simplest soln was netsane

take a look
http://www.linuxquestions.org/questi...d.php?t=381437