Bonding two internet connections

zamri · 08-15-2005, 02:47 AM

Hi all,

I have 2 broadband connection at my office. I just want to know how can I "bond" these two together. I have read of ethernet bonding. How am i do that? Can anyone give simple network diagram to achieve this.?

Thanks in advance.

satinet · 08-15-2005, 02:54 AM

You need a special router for this. While this is not too hard, they are rather expensive i believe. That said maybe some has built a linux box to do this instead? I suppose if you had a linux box with 2 NICs on the internet side and one on the LAN side, you could use linux to load balance etc...

Anyone done this, as it is of interest to me?

zamri · 08-16-2005, 12:59 AM

thanks for the reply. I have searched for the answer and i got this :

3 NICs for the Linux server. 2 of them to connect to the internet. 1 to connect to LAN.

I have 2 broadband connections with the same ISP. ethernet bonding can be done with these two.

My configuration:

eth0 -- xxx.xxx.xxx.xxx (public ip) <-- to ISP
eth1 -- aaa.aaa.aaa.aaa (private ip) <-- connected to LAN
eth2 -- yyy.yyy.yyy.yyy (public ip) <-- to ISP

Code:

modprobe bonding mode=0
ifconfig eth0 down
ifconfig eth2 down

ifconfig bond0 ??????????? up
ifenslave bond0 eth0
ifenslave bond0 eth2

what ip should i use for the bonding device. private ip or public ip?

fr_laz · 08-16-2005, 07:59 AM

hi,

you should use a public IP, but i don't think you'll be able to use the IP given by your first provider on the link to the second one.
i think that so as to use bonding, both your machine AND the network equioement on which it is connected must be configured for bonding... which won't be the case since you'll have trouble to have your 2 ISP agree on that

maybe you should have a look at multi-homing (or load balancing between 2 ISP), here's an howto: http://lartc.org/howto/lartc.rpdb.multiple-links.html

(give a try with bonding prior to looking at loadbalancing, since it's much more easy... but i would be _greatly_ surprised if it worked).
good luck

zamri · 08-16-2005, 11:44 AM

thanks buddy. I'll take a look at it and see whether it will work.

zamri · 08-17-2005, 09:15 AM

let's say i have 2 default gateways. meaning that the 2 gateways are the link to the two providers that i have.

route add default gw jjj.jjj.jjj.jjj
route add default gw kkk.kkk.kkk.kkk

When I connect to the internet, which route the packets will go through? I noticed that the two modems were blinking when I connected to the internet.

Can I use this command to load-balance the connection?

ip route add default scope global nexthop via jjj.jjj.jjj.jjj dev eth0 weight 1 nexthop via kkk.kkk.kkk.kkk dev eth2 weight 1

zamri · 08-19-2005, 10:42 AM

hi all,

After several days of hard work, my work has come to a dead end. the command ip route stated above when run produced error. I have no clue what caused this but i think i have to make a table T1 and T2. How to add these tables in /etc/iproute2/rt_tables? as stated in this link : http://lartc.org/howto/lartc.rpdb.multiple-links.html

anyone please?