Channel Bonding

Velocet math at velocet.ca
Mon Jan 28 01:50:04 EST 2002


On Sun, Jan 27, 2002 at 01:27:32PM -0600, David McBride's all...
> Thanks for the reply.
> I am trying to be able to do two different things.
> 1) I am trying to perform is to channel bond with a linux router that has 3
> nics, 2 connected to two different cable modems and one for the lan side to
> provide internet access.
> 2) I am trying to perform is to channel bond with a linux router that has 3
> nics, 1 connected to a cable modems and one connected to a ADSL line and one
> for the lan side to provide internet access, connected to a hub.
> 
>            same ISP             and         Different ISP's
>  
>      cable modem 1 cable modem 2         ADSL line   Cable modem
>          eth0 \      / eth1                eth0 \      / eth1
>                \    /                            \    /
>             linux router                       linux router
>                  | eth2                        eth2 |
>                  |                                  |
>                 hub                                hub
>                 /|\                                /|\ 
>               multiple PC's                    multiple PC's    

this is way outside the scope of the beowulf list.

what you want is either Iproute2 for linux, or, the way i do it
which also agregates bandwidth, is multilink PPP over udp with a remote
server (actually, 2 mp sessions and OSPF, to be exact, in case remote
server dies, then other mp session to other server stays up :)

channel bonding is for broadcats mediums only - ie local ethernet
segments.

you can also  try policy routing if you have a preferred remote set
of hosts to route via one internet connection, leaving the other for
general traffic.

/kc

> 
> 
> Thanks again for the reply and any further help,
> David 
> 
> 
> -----Original Message-----
> From: abhishek Sinha [mailto:aby_sinha at yahoo.com]
> Sent: Saturday, January 26, 2002 9:42 PM
> To: David McBride
> Subject: Re: Channel Bonding
> 
> 
> Hi David 
> 
> Channel bonding happens with ethernet cards.
> If u want to gain in more bandwidth then channel
> bonding or trunking as it is known as  would be
> helpful.Suppose ur box has 2 ethernet devices
> configured.eth0 and eth1. if u compile the channel
> bonding code and put it in the kernel they can be made
> to behave as a single port.so ur beandwidth becomes
> double.But some minimal time is spend in distributing
> the packets at the hardware queue  level.
> 
> So it also depends upon at what rate packets are u
> getting. Suppose the bandwith(Max) which ur card can
> take is A and u ur getting a packet inflow rate of
> about 2A then it makes sense to channel bond 2 eth
> devices. Otherwise there is no point. There is more to
> this. U should know how much is ur average network
> traffic 
> 
> abby
> --- David McBride <DMcBride at ctwenterprises.com> wrote:
> > I am a total newbie to Beowulf and was wondering if
> > the channel bonding
> > could be used to join the bandwidth from two cable
> > modems into a single
> > bandwidth to get some killer speed.
> > 
> > Thanks,
> > David
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> 
> =====
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> 
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-- 
Ken Chase, math at velocet.ca  *  Velocet Communications Inc.  *  Toronto, CANADA 
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