Hi,
I have a linux server running kernel 2.6.19 that is connected with 2
seperate 100Mbit links to the same isp:
+---+
+---------------+ | I |
+---------------+
| | | S |
| |
| eth0 --+--------------+ P |
| |
| | | S |
| |
| linux 2.6.19 | | W |========================| ISP
GATEWAY |
| | | I |
| |
| eth1 --+--------------+ T |
| |
| | | C |
| |
+---------------+ | H |
+---------------+
+---+
Both links have their own ip but have the same gateway. The problem is I
can't seem to get egress traffic load balanced over the 2 nics.
IP config after boot (dhcp from isp)
ip a:
1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
2: eth0: <BROADCAST,MULTICAST,NOTRAILERS,UP,10000> mtu 1500 qdisc
pfifo_fast qlen 1000
link/ether 00:00:00:00:00:0f brd ff:ff:ff:ff:ff:ff
inet 10.0.0.110/24 brd 10.0.0.255 scope global eth0
3: eth1: <BROADCAST,MULTICAST,NOTRAILERS,UP,10000> mtu 1500 qdisc
pfifo_fast qlen 1000
link/ether 00:00:00:00:00:ed brd ff:ff:ff:ff:ff:ff
inet 10.0.0.120/24 brd 10.0.0.255 scope global eth1
Default routing table after boot
ip r:
10.0.0.0/24 dev eth0 scope link
10.0.0.0/24 dev eth1 scope link metric 1
127.0.0.0/8 dev lo scope link
default via 10.0.0.1 dev eth0
default via 10.0.0.1 dev eth1 metric 1
I enabled ip_forward and set arp_ignore to 1 for eth0 and eth1 to make
sure the correct nic answers to arp requests.
I tried to get the egress load balancing to work by replacing the above
two default routes with:
ip route add default mpath drr nexthop via 10.0.0.1 dev eth0 weight 1
onlink nexthop via 10.0.0.1 dev eth1 weight 1 onlink
I assumed that with mpath device round robin both nics would be used
more or less equally, but the reality is only one of the nics actually
works and the second nic even stops responding to arp requests.
Am I doing something totally wrong or impossible here or is the device
round robin code not working properly?
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