[LARTC] load balancing over 4 lines to one provider

[LARTC] load balancing over 4 lines to one provider

[Marcos Dione]

  yes, this is a crazy subject. I have 4 ADSL lines to the same provider, which
even have the same gateway. Those lines are connected to the same machine (more
crazyness: even connected to the same nic. it works fine, I swear). this machine
will serve this conenction to a local net.

  so, I setup the ifaces correctly, everything works. I add balancing using this
command:

# ip route replace default nexthop dev ppp0 nexthop dev ppp1 nexthop dev ppp2
nexthop dev ppp3

  I try this downloading a iso image using BT and checking with iptraf. the load
gets balanced. fine.

  then I issue this command to setup masquerading for each ppp line:

# for i in 1 2 3 4; do
> sudo iptables -t nat -A POSTROUTING -s 172.16.16.0/22 -o ppp$i -j MASQUERADE;
> done

  now I try to do the same download from a machine in the intranet and all the
traffic goes to only one of the ppp lines.

  is important to note that this setup was successfully working in a previous
incarnation of the gateway (this time each ppp line was attached to its own
nic, but I think this is irrelevant, as balancing *is* somewhat working)
running a 2.4.7 kernel from RedHat-6.0 (yes, *that* old; reason why we're
trying to replace it with something newer).

  so, any ideas? if you need more data, don't hesitate to ask.

-- 
Marcos Dione
Departamento de Cómputos
Facultad de Ciencias Químicas - UNC

----------------------------------------------------------------
Facultad de Ciencias QuÃmicas - Universidad Nacional de CÃrdoba
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Re: [LARTC] load balancing over 4 lines to one provider

[Zoilo Gomez]

Marcos Dione wrote:

>  yes, this is a crazy subject. I have 4 ADSL lines to the same provider, which
>even have the same gateway. Those lines are connected to the same machine (more
>crazyness: even connected to the same nic. it works fine, I swear). this machine
>will serve this conenction to a local net.
>
>  so, I setup the ifaces correctly, everything works. I add balancing using this
>command:
>
># ip route replace default nexthop dev ppp0 nexthop dev ppp1 nexthop dev ppp2
>nexthop dev ppp3
>
>  I try this downloading a iso image using BT and checking with iptraf. the load
>gets balanced. fine.
>
>  then I issue this command to setup masquerading for each ppp line:
>
># for i in 1 2 3 4; do
>  
>
>>sudo iptables -t nat -A POSTROUTING -s 172.16.16.0/22 -o ppp$i -j MASQUERADE;
>>done
>>    
>>
>
>  
>

Have you tried instead:

iptables -t nat -A POSTROUTING -s 172.16.16.0/22 -o ppp+ -j MASQUERADE


?

I do not know the implementation, but perhaps one rule with a '+' makes 
a difference over summing up the 4 individual interfaces.

Interesting setup you have anyway!
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Re: [LARTC] load balancing over 4 lines to one provider

[Marcos Dione]

Quoting Zoilo Gomez <zoilo@xs4all.nl>:
> Have you tried instead:
>
> iptables -t nat -A POSTROUTING -s 172.16.16.0/22 -o ppp+ -j MASQUERADE
>
>
> ?
>
> I do not know the implementation, but perhaps one rule with a '+' 
> makes a difference over summing up the 4 individual interfaces.

  no joy :-|

-- 
Marcos Dione
Departamento de Cómputos
Facultad de Ciencias Químicas - UNC

----------------------------------------------------------------
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