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netbui
n00b
Joined: 03 Jul 2006
Posts: 48
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 Posted: Mon Oct 02, 2006 11:05 am Post subject: 2 NICs, routing, failover and metric |
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Hi,
I running Gentoo on a Notebook with both LAN and WLAN. I want to setup the network that it is using as default the LAN connection and, when it is unavailable, automatically make a failover to the WLAN interface. Currently, I have to stop the LAN interface manually with /etc/init.d/net.eth0 stop to use the WLAN. If I do not stop eth0, I cannot connect through ma WLAN adapter eth1.
I have read, that the option metric is used for this purpose. My setup is as follows:
| Code: | LAN is 192.168.5.15, Broadcast 192.168.0.255 metric 1
WLAN is 192.168.0.16, Broadcast 192.168.0.255 metric 2
Default gateway: 192.168.0.1 |
Is it possible to use metric in this way, or is there a other solution for this problem? Can I use metric for the NICs, even if they are in the same subnet?
Currently I am in the Office and cannot provide you with a rout output.
I wonder if somebody have a hint for me and thank you in advance. |
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gerdesj
l33t
Joined: 29 Sep 2005
Posts: 622
Location: Yeovil, Somerset, UK
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| Posted: Mon Oct 02, 2006 6:12 pm Post subject: Re: 2 NICs, routing, failover and metric |
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You need a multi-link route which will need a kernel recompile and a good read of http://lartc.org/howto/ alternatively use a routing daemon eg Quagga:
Zebra is the original and Quagga is a fork of the code.
Your /etc/quagga/zebra.conf might look something like:
| Code: | !
! Zebra configuration saved from vty
! 2006/02/24 16:25:19
!
hostname <your hostname>
password <your password>
enable password <your password>
log file /var/log/quagga/zebra.log
!
interface eth0
!
interface lo
!
interface wlan0
ip route 0.0.0.0/0 eth0 1
ip route 0.0.0.0/0 wlan0 2
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rc-update add zebra default and off you go. It might seem a bit overkill but it gives you a lot of extra flexibility. You don't have to enable forwarding but if you do, then you have a router on your hands.
0.0.0.0/0 is your default route and Quagga will select which one is needed according to the 1 and 2 (metric). You can set both to the same metric and Q will set a multi link route but I've had limited success with this.
Cheers
Jon |
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netbui
n00b
Joined: 03 Jul 2006
Posts: 48
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| Posted: Tue Oct 03, 2006 10:28 am Post subject: |
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Hi,
thank you very much, I will try it tonight 
Cheers |
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