[LARTC] Multiple ADSL link

[LARTC] Multiple ADSL link

[Jerome Kerdreux]

Hi all,

It's my first post on this list, i'm not a ip route / qdisc
guru, and have a awfull english. So if i may say something
stupid ...


In fact i got a problem with my ISP(s) .

I have 2 ISP / 2 DSL Modem / 3 nic / on my firewall
and something like 20 computers behing it.


      20 machines with 192.168.0.xxx/16 private IPs
                       |
                       |
                       |eth2 (192.168.0.1)
              ===========
              |     Linux 2.4.18   |
              ===========
                 |eth0         |eth1
                 |             |
                 |             |
                 |             |
               ppp0           ppp1
               (IP1)          (IP2)

Notation :

provider 1 :
IF1="ppp0"                      # interface
IP1="xxx.xxx.xxx.xxx"           # ip of if1
P1="xxx.xxx.xxx.1"             # gateway ip
P1_NET="xxx.xxx.xxx.0"          # network

provider 2 :
IF2="ppp1"
IP2= ...
P2= ...
P2_NET= ...



eth0 and eth1 have no ip there are only used for the ppp


Now I can only use 1 provider at the same time
cause I can't route them.


As said before I want to use the provider at the same
time without distinction.(Perhaps I will look at a
way to have stmp / dns / ssh on one ppp and ftp /
http on the other but i gonna try w/ a simple thing
before )


I tried several things like the teql module.
http://lartc.org/howto/lartc.loadshare.html
but I still have the same pb. the teql module
is loaded but outgoing packet don't know the
way to go out (I think)



So yesterday i try w/ load balancing  way
http://lartc.org/howto/lartc.rpdb.multiple-links.html#AEN284
(multipath in fact)

I figured out how to have ppp0 and ppp1 used at
the same time the ppp0 doesn't transmit anything.
only some udp 6 (really strange)
Another thing I don't really understand if I need
to use the Split Access (previous in the howto).

This section isn't really clear for my awfull english
and isn't transalted in the french howto.


Does I need to add something else than

ip route add default scope global nexthop via $P1 dev $IF1 weight 1
nexthop via $P2 dev $IF2 weight 1



And the next question is how can I NAT this traffic
cause I don't have only one IF but 2 ?
(with teql I is easy .. but don't work for me) ..




Thanks for any help.





------------------------
Jerome Kerdreux aka SoaF



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Re: [LARTC] Multiple ADSL link

[Jerome Kerdreux]

Today, mahhy a écrit:

m>On Thu, 11 Jul 2002, Jerome Kerdreux wrote:
m>> ip route add default scope global nexthop via $P1 dev $IF1 weight 1
m>> nexthop via $P2 dev $IF2 weight 1

m>I havent looked at the LARTC HOWTO in depth yet, but I believe you are
m>wanting to implement Equal Cost Multipath Routing.  ECM allows for
m>*outgoing* traffic to be load-balanced across multiple ISP connections.
m>
m>There is some good information in the Advanced Routing HOWTO on
m>http://www.linuxdoc.org, I suggest you read that as well.
m>
m>Here is the general script I use to implement ECM, you will have to edit
m>it for your own values (different interface names, IP addresses, gateway
m>addresses, etc):
m>
m>  /sbin/ip rule add from <IP Num 1> table 124
m>  /sbin/ip rule add from <IP Num 2> table 120
m>  /sbin/ip route add default via <IP-GW Num 1> dev eth0 table 124
m>  /sbin/ip route add default via <IP-GW Num 2> dev ppp0 table 120
m>  /sbin/ip route delete default
m>  /sbin/ip route add default scope global nexthop via <IP-GW Num 1> dev
m>eth0 nexthop via <IP-GW Num 2> dev ppp0
m>  /sbin/ip route flush cache
m>
m><IP Num 1> is the first IP address on my Linux Router
m><IP Num 2> is the second IP address on my Linux Router
m><IP-GW Num 1> is the first IP address's default Gateway
m><IP-GW Num 2> is the second IP address's default Gateway
m>
m>replace them with appropriate values for your system.

Oh thanks Mahhy I test that :)


Here is what I test :


/sbin/ip rule add from <IP Num 1> table T1
/sbin/ip rule add from <IP Num 2> table T2
/sbin/ip route add default via <IP-GW Num 1> dev ppp0 table T1
/sbin/ip route add default via <IP-GW Num 2> dev ppp1 table T2
/sbin/ip route delete default
/sbin/ip route add default scope global nexthop via <IP-GW Num 1> dev ppp0 nexthop via <IP-GW Num 2> dev ppp1
/sbin/ip route flush cache


but I still have the same pb
===================================================================
ip route:
194.206.78.3 dev ppp1  proto kernel  scope link  src 62.212.102.172
80.15.151.1 dev ppp0  proto kernel  scope link  src 80.15.151.117
192.168.0.0/16 dev eth2  proto kernel  scope link  src 192.168.0.1
default
        nexthop via 80.15.151.117  dev ppp0 weight 1 dead
        nexthop via 62.212.102.172  dev ppp1 weight 1
===================================================================

ppp0 seems to be detected as dead.


So all the trafic go throught ppp1 and only get this on ppp0
===================================================================
tcpdump -i ppp0:
15:50:22.786991 80.24.174.28.1073 > 80.15.151.117.4665:  udp 6
15:50:22.787074 80.15.151.117 > 80.24.174.28: icmp: 80.15.151.117 udp
port 4665 unreachable [tos 0xc0]
15:50:36.917769 62.178.40.99.1275 > 80.15.151.117.4665:  udp 6
15:50:36.917855 80.15.151.117 > 62.178.40.99: icmp: 80.15.151.117 udp
port 4665 unreachable [tos 0xc0]
15:50:37.446685 217.235.251.61.2588 > 80.15.151.117.4665:  udp 6
15:50:37.446767 80.15.151.117 > 217.235.251.61: icmp: 80.15.151.117
udp port 4665 unreachable [tos 0xc0]
===================================================================
all the trafic i get it that  :(



Another thing is that when I drop all the route and just put
ppp0 as default route. this interface works well . this sound
really strange.


Any body have a idea ?



I put the list in Cc: too :)

/Thanks


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Re: [LARTC] Multiple ADSL link

[Julian Anastasov]

	Hello,

On Thu, 11 Jul 2002, Jerome Kerdreux wrote:

> default
>         nexthop via 80.15.151.117  dev ppp0 weight 1 dead
>         nexthop via 62.212.102.172  dev ppp1 weight 1
> =================================>
> ppp0 seems to be detected as dead.

	This bug is fixed in iproute2 package from this year.
Fetch the latest archive.

Regards

--
Julian Anastasov <ja@ssi.bg>

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Re: [LARTC] Multiple ADSL link

[Jkx]

On Thu, 11 Jul 2002, Julian Anastasov wrote:

>
> 	Hello,
>
> On Thu, 11 Jul 2002, Jerome Kerdreux wrote:
>
> > default
> >         nexthop via 80.15.151.117  dev ppp0 weight 1 dead
> >         nexthop via 62.212.102.172  dev ppp1 weight 1
> > =================================> >
> > ppp0 seems to be detected as dead.
>
> 	This bug is fixed in iproute2 package from this year.
> Fetch the latest archive.

(Please add this in the Howto . I spent a couple of
hours to find that)


Ok thanks .. I miss this bug fix . and gonna try this
tomorrow.


so the nex question is :
How could i NAT my local traffic throught this 2 ppp
I usually do that w /

$IPTABLES -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

but this assume you have only one not two :))




Thanks again all for the help. :)


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Re: [LARTC] Multiple ADSL link

[Julian Anastasov]

	Hello,

On Fri, 12 Jul 2002, Jkx wrote:

> > 	This bug is fixed in iproute2 package from this year.
> > Fetch the latest archive.
>
> (Please add this in the Howto . I spent a couple of
> hours to find that)

	Always use the latest software in such situations, the
HowTo is not a changelog :)

> so the nex question is :
> How could i NAT my local traffic throught this 2 ppp
> I usually do that w /

	Check this URL:

http://www.linuxvirtualserver.org/~julian/#routes

	and read some docs and the included examples. Then
you will be able to build correct routing rules for your
setup.

Regards

--
Julian Anastasov <ja@ssi.bg>

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