I have a linux server running Mandrake 10, with the kernel
configured with "CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_IP_MULTIPLE_TABLES=y
CONFIG_IP_ROUTE_MULTIPATH=y" options, with 4 ethernet
cards:
- 2 ethernet used to connect to my lan (eth0=192.168.1.x and
eth1=192.168.2.x)
- 2 ethernet used to internet connection (2 adsl lines, both
with 600/300 kbtis)
The two lan are used to share the internet connetion with my
friends. We run p2p services on the linux server, so all the
heavy traffic is generated directly by the linux server.
The main objective here is to load balance the traffic
generated by the p2p services running on the server and the
lan through the 2 adsl lines, and make the 2 adsl 600/300
kb/sec looks like a 1200/600 kb/sec connection...
Here is a diagram of the network (i don´t know if it helps..
but.. here it is):
___________________
eth0 | |ppp0
_______| Linux Server |__________
| (Firewall + P2p |
_______| +Traffic control |__________
eth1 | +Load Balance) |ppp1
|__________________|
To make the traffic control i mark all packets using iptables,
then i put identical cbq rules on each ppp connection. My ideia
is that the packets go to the cbq qdiscs only after they was
routed to that ppp connection... is that right? If it is, this
might work...
The load balance is a problem.. i tried to load balance using
the commands below:
ip rule add from 200.193.25.93 lookup 1
ip route add 192.168.1.0/24 via 192.168.1.1 table 1
ip route add 192.168.2.0/24 via 192.168.2.1 table 1
ip route add 0/0 via 200.138.225.254 table 1
ip rule add from 201.3.232.150 lookup 2
ip route add 192.168.1.0/24 via 192.168.1.1 table 2
ip route add 192.168.2.0/24 via 192.168.2.1 table 2
ip route add 0/0 via 201.3.196.254 table 2
ip route add default equalize nexthop via 200.138.225.254
dev ppp0 nexthop via 201.3.196.254 dev ppp1
But... when i use the above commands the lan can´t
communicate with the internet, just the linux server can see
the internet... so i need to put one of the ppp connection as
a "default gateway" to make the lan see the internet, using
the command:
route add default gw 200.138.225.254
then, i get this route table:
200.138.225.254 * 255.255.255.255 UH 0
0 0 ppp0
201.3.196.254 * 255.255.255.255 UH 0
0 0 ppp1
192.168.4.0 * 255.255.255.0 U 0 0
0 eth3
192.168.2.0 * 255.255.255.0 U 0 0
0 eth1
192.168.1.0 * 255.255.255.0 U 0 0
0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 201.3.196.254 0.0.0.0 UG 0 0
0 ppp1
default 200.138.225.254 0.0.0.0 UG 0 0
0 ppp0
But, in this case, the traffic coming from the lan don´t get
load balanced... just go through the ppp0 (200.138.225.254),
and looks very strange to me to have two "default gateway".
Even if i keep the first configuration option, without using
the "route add default gw 200.138.224.254" command, and
keeping the lan disconnected (for test purposes) i can see
that the traffic generated by the linux server use the 2 adsl
lines, but it don´t make a "load balance"...if i make
a "traceroute" it ALWAYS go through the first "NEXTHOP" ip
configured on the "ip route add default equalize nexthop"
command...
Even if i give a "ip route list cache" and catch a ip that on the
cache route list go through the second nexthop ip, the
traceroute go through the first nexthop ip... So i don´t
understand: why the traceroute don´t use the cached route? I
can only imagine that something is wrong in my
configuration...
And worst: keeping the server running with two default
gateways for a long time i can see that NEVER the traffic get
more than 80 Kbytes/sec (640 Kbytes)...In a healthy system
with correct configuration, running p2p services, with hundreds
of simultaneous connections, the speeds should go near the
1000 kbits (125 Kbytes/seg) even if i consider the adsl
overhead...
Someone have some idea of where is the problem? Why i get
a poor load balance that never gets more than 60% of the
bandwidth of each adsl?
The internet have just a few load balance information... i read
almost all the pages google could find and i still can´t figure
out what´s the problem.. I´ll appreciate all help u can give
me!
Tks in advance!
Fernando Favero
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