Re: [LARTC] Multiple ADSL link

[Jerome Kerdreux <Jerome.Kerdreux@finix.eu.org>]

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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