Re: [LARTC] multi ADSLs links

[Andy Furniss <andy.furniss@dsl.pipex.com>]

ThE LinuX_KiD wrote:
> hi,
> 
> I've a dedicated internet link 512k with a cisco
> router,
> and now, I want to upgrade bandwidth with
> 8 ADSLs (512k each)
> 
> then:
> 
> 
> - build kernel 2.4.27 with pachs:
> 
> 	- patch-o-matic-ng-20040621 :  CONNMARK, H323, etc...
> 	- http://www.ssi.bg/~ja/#multigw   Julian's patch.
> 	- Activate "equal cost multi path"
>         (Advanced Router-Networking Options)
> 	  and so on
> - build iptables.1.2.11
> - build iproute2 with HTB patch
> 
> ADSLs are connected by modems/routers "Ericsson HM210dp"
> 
> I configure then with:
> 	- the pppoe username and password
> 	- nat
> 	- A static route (in order to reach LAN network)
> 	- LAN ip ethernet in this way:
> 
> 		modem/router 1 -> IP LAN : 172.16.1.1
> 		modem/router 2 -> IP LAN : 172.16.1.2
> 		 ....
> 		modem/router 8 -> IP LAN : 172.16.1.8
> 
> In LINUX BOX, I don't make NAT because modems/routers do it.
> -except if I go to internet througth Cisco router-
> 
> 
> then, I have this:
> 
> modem1		modem2	...	modem 8
> 172.16.1.1		172.16.1.2 	...	172.16.1.8
> 	|			|			|
> 	|			|			|
> 	+-----------------+----- ... -------+
> 	|
> 	|
> 
> 	|                  LINUX
> ------+------------------------+
> | eth2: 172.16.1.100           |
> |                              |
> |            eth0: 200.26.X.Y1 +--> 200.26.X.Y4 (CISCO)-->internet
> |                              |
> | eth1: 192.168.221.254        |
> +-----+------------------------+
>       |
>       |
>       +---> RED LAN 192.168.221.0/24
> 
> 
> Also, each modem/router haves next static route:
> 
> "192.168.221.0/24 via 172.16.1.100"
> 
> in order to reach LAN 192.168.221.0/24
> 
> 
> Finally, I make next script:
> 
> 
> #!/bin/sh
> 
> # flush all NICs
> 
> ip addr flush dev eth0
> ip addr flush dev eth1
> ip addr flush dev eth2
> ip addr flush dev lo
> 
> ip link set eth0 down
> ip link set eth1 down
> ip link set eth2 down
> ip link set lo down
> 
> 
> # set up all nics
> 
> ip addr add 127.0.0.1/8 dev lo
> ip link set lo up
> ip route add 127.0.0.0/8 dev lo
> 
> ip link set eth0 up
> ip addr add 200.26.X.Y1/29 brd 200.26.X.Y2 dev eth0
> ip route add 200.26.X.Y3/29 dev eth0
> 
> ip link set eth1 up
> ip addr add 192.168.221.254/24 dev eth1
> ip route add 192.168.221.0/24 dev eth1
> 
> ip link set eth2 up
> ip addr add 172.16.1.100/24 dev eth2
> ip route add 172.16.1.0/24 dev eth2
> 
> 
> # routing...
> 
> echo 1 > /proc/sys/net/ipv4/ip_forward
> 
> ip r a default proto static \
> nexthop via 172.16.1.1 dev eth2 \
> nexthop via 172.16.1.2 dev eth2 \
> nexthop via 172.16.1.3 dev eth2 \
> nexthop via 172.16.1.4 dev eth2 \
> nexthop via 172.16.1.5 dev eth2 \
> nexthop via 172.16.1.6 dev eth2 \
> nexthop via 172.16.1.7 dev eth2 \
> nexthop via 172.16.1.8 dev eth2 \
> nexthop via 200.26.X.Y4 dev eth0
> 
> # (last  IP is cisco's IP as default gateway of dedicated
> # internet link)
> 
> 
> # I only make NAT if packet go out internet trought Cisco
> 
> iptables -F -t nat
> iptables -A POSTROUTING -t nat -o eth0 -s 192.168.221.0/24 -j
> SNAT --to-source 200.26.X.Y1
> 
> 
> # also I make next rules in order to
> # reach linux box from internet.
> 
> ip ru d from 200.26.X.Y3/29 table 200
> ip ru a from 200.26.X.Y3/29 table 200
> ip r a default via 200.26.X.Y4 table 200  # <-- ip del CISCO
> ip r a 192.168.221.0/24 src 192.168.221.254 dev eth1 table 200
> 
> 
> MY RESULTS:
> 
> from Internet, I can reach LINUX box without problems
> but...
> 
> 
> browse web pages from LAN hosts is poor
> 
> sometimes, we get a very good browsing speed,
> but some others times happens something rare:
> 
> I need to click in STOP and REFRESH in my browser
> in order get access to some web pages (that happens
> in diferrents ways)
> 
> any ideas ???

I assume you have 8 different real IP addresses, not multilink.

I have no experience with load balancing but have read that some web 
servers won't serve files to an unknown IP address - so you may need to 
find a way to get all the tcp connections after the first one to use the 
same route.

Andy.


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