Re: [LARTC] ADSL channel boding or Load balancing

[Grant Taylor <gtaylor@riverviewtech.net>]

On 10/25/07 00:49, the sew wrote:
> You were right, the usb modem mehtod was just a way for me to see how 
> usb modems works in linux, u basicly add new firmware and load the 
> driver and it sees your usb modem also as a ethernet device and u use 
> pppd with that :-)

*nod*  That's the experience that I had too.  I will say that I 
perceived performance to be a bit better with the USB ADSL modem than I 
did with external bridging modems.  I attributed this perceived 
performance improvement to be related to more intelligent caching of 
data on the system with the IP stack with comparison to external modems 
that did not know if there would be any more packets coming or not thus 
the external would have to wait longer before transmitting packets.  I 
have no numbers to back this up, but I did perceive a performance 
improvement both under Linux and Windows with my USB ADSL modem and 
under Windows with my PCI ADSL modem.

> Im trying your option below to get increased upload, but no luck yet
> 
> from your ascii , mine looks similar

                 +-----------+     +---------+
  +--------+     | ...245.18 +-----+ ...77.1 |     +-------+
  | ...0.x +-----+ ...0.1    |     |    COLO +-----+ 101.x |
  +--------+     | ...245.19 +-----+ ...78.1 |     +-------+
                 +-----------+     +---------+

(Slight clean up.)

> the background how I got this setup is that 245.18 and 19 has pppoe 
> into my ISP, then I made a pptp tunnel to COLO on 2 diffrent ips and 
> got my new ips which is 245.18 Ptp 77.1 and 245.19 Ptp 78.1.
> 
> All this works fine, I've even add multiple routes to 101.x via dev 
> ppp0 nexthop dev ppp1, but this just load balances the links, not 
> increase uploads

Where are you doing your NATing to the world?  Are you NATing on your 
PPtP tunnels or on the COLO system?

> Is it possible at all to route all upload via both links at the same 
> time, maybe disable the cached routes, let it just change routes the 
> whole time?

If you are doing your NATing on the COLO system and you add two routes 
to your internal network via the two PPtP tunnels, you should be able to 
equal cost multipath route across both PPtP tunnels to achieve increased 
bandwidth.  The key part is that both tunnels have to appear to the 
world as a single external IP.

> Thanks agian for your help

You are welcome.



Grant. . . .
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