On Tue, 2 Oct 2001, David McBride wrote:
> Okay, here we go again. I am trying to join the bandwidth of two cable
> modems.
I thought you were working with a dsl and cable connection. Perhaps this
is just for learning?
Two cable modems.... hmmm...
ISP -----+---------+----------
| |
mdmA mdmB
| |
***eth0******eth2***
* *
* LEAF router *
* *
********eth1********
|
|
The problem with trying to get better bandwidth using two cable modems is
that the cable itself is being shared. The only bandwidth improvement you
will get is having two devices contending for access instead of one.
Thus, if your LRP and one other subscriber are the only ones contending
for bandwidth, you get two-thirds of the bandwidth. If there are a couple
of dozen modems contending for access on that segment, then you may go
from 4% to 8% of the bandwidth. Or, if you are the only one contending for
access, your double modem setup gains you nothing.
Thus, at the very time when you want to improve your throughput (high
contention), you are only able to achieve a fraction of the throughput you
have under ideal circumstances, so the appearance is that having two
modems is really gaining you nothing. Despite the relative gain, my
tapping fingers would question whether a gain of 4% is worth the effort.
> I am useing the Eigerstein disk with kernel and nic modules from
> Eigerstein2beta/20010527 for pentium cpu. evrything works except that only
> one nic is used for internet instead of both. From lrp I can ping all
> interfaces and network and internet, from system on network the same is
> true. All works, except the joining of bandwith. I read the
> load-balanceing doc, but did not understand it. I am pretty sure I need
> to do the round robin.
I can't help with that. Jack Coates seemed to be having troubles with
this recently, so you might want to look back through the archives.
> I know this is probably for two different routers, but I dont see how else I
> can do it. My ip info is eth0 208.180.172.208 netmask 208.180.172.0/24 gw
> 208.180.172.1, eth2 208.180.172.209 rest same as eth0. eth1 is lan side.
>
> router1
> route add -net a.a.a.a netmask b.b.b.b gw c.c.c.c
> route add -net z.z.z.z netmask y.y.y.y metric 1 dev eth0
>
> router2
> route add -net z.z.z.z netmask y.y.y.y gw x.x.x.x
> route add -net a.a.a.a netmask b.b.b.b metric 1 dev eth0
>
> Dont undrestand how to fill in the blanks.
> When I tried route add .... it said route not found. I tried ip route add
> -net ........ and a "inet prefex is expected not "-net" error" message
> appeared.
"route" is not present in Eigerstein, and the "ip" syntax is quite
different from "route" syntax.
The correct syntax _is_ encoded in /etc/init.d/network, so why not use the
/etc/network.conf file to invoke those commands?
> NOw Im really confused. Please someone help me gain what little sanity I
> used to have.
You have tackled a difficult problem. If difficult problems push you over
the edge, maybe you should work on something easier. :)
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