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2 NIC on same subnet Linux Embedded
eth0 = 192.168.1.87 sub 255.255.255.0
eth1 = 192.168.1.88 sub 255.2555.255.0
I tried temporary with
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
but it doesn't' work!
all traffic (ping) come from eth0, if i disconnect eth0, then eth1 is not able to answer to ping
(the same command into a #! linux works properly..)
Hi and welcome.
There are at least two ways.
First is to use bonding. http://www.kernel.org/doc/Documentat...ng/bonding.txt
You define a new interface bind0 with eth0 and eth1 as slaves.
This bind0 can then have alias IPs
The second is to use source based routing.
Aka: What comes in via eth0, comes out via eth0 and the same for eth1.
This code is untested. For details look here: Routing for multiple uplinks/providers
ip route add 192.168.1.0/24 dev eth0 src 192.168.1.87 ip route add 192.168.1.0/24 dev eth1 src 192.168.1.88 ip route add default scope global nexthop via <YOUR_GW_IP> dev eth0 weight 1 nexthop via <YOUR_GW_IP> dev eth1 weight 1
It seems more obvious too me and offers failover, but ymmv.You must always face the curtain with a bow.
I'm pretty newbie with Linux.. is it possible to test bonding in runtime without make system modifications? (my embedded box is an industrial automation device and I prefer void "hard" testing on it..)
the strange thins is using "arp_ignore" and "arp_announce" it works properly on a crunchbang distro, the same settings in my embedded linux box, do not..why? Some settings to check?
To play around, you can use the ifconfig (or ip) command together with ifenslave.
ifenslave potentially needs installation.
modprobe bonding ifconfig bond0 192.168.1.87 up ifconfig bond0:0 192.168.1.88 up ifenslave bond0 eth0 ifenslave bond0 eth1 ifconfig bond0:0 down ifconfig bond0 down ifenslave -d bond0 eth0 eth1
Not sure about the difference in behaviour between crunchbang and your embedded linux.
Maybe different kernel versions and/or config.You must always face the curtain with a bow.