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Hi all, I'm working on an embedded Linux system 22.214.171.124-rt24 equipped with 2 NIC eth0 and eth1. I need to set them on the same subnet eth0 = 192.168.1.87 sub ...
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- 11-09-2012 #1
2 NIC on same subnet Linux Embedded
Hi all, I'm working on an embedded Linux system 126.96.36.199-rt24 equipped with 2 NIC eth0 and eth1. I need to set them on the same subnet
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..)
- 11-09-2012 #2
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.
- 11-09-2012 #3
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..)
- 11-09-2012 #4
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?
- 11-09-2012 #5
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.