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psychoteur
n00b
Joined: 26 Jul 2006
Posts: 34
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 Posted: Sun Jun 21, 2009 5:51 pm Post subject: Dnsmasq with three ethernet card |
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Hi.
I want to setup a home server.
I use three ethernet card.
Eth0 for wan connected through a modem-lan router. (Intel Pro 100)
Eth1 for lan. Used to connect a old laptop. (Via_rhine)
Eth3 for lan connected with a hub 1g (Linksys 1G realtek r8169)
My problem is :
I'm unable to have eth1 and eth3 both working at the same time.
When I plug a cable into it, I can't get an ip.
Eth3 only works if I don't setup it in rc-update.
Udev issue ???
I set in dnsmasq.conf
Interface=eth1
Interface=eth3
My /etc/conf.d/net
#Intel pro
config_eth0=( "10.0.0.3 brd 10.0.0.255 netmask 255.0.0.0" )
routes_eth0=( "10.0.0.138" )
dns_servers_eth0=( "195.238.2.21 195.238.2.22" )
#Dlink Via_Rhine
config_eth1=( "10.0.0.2 brd 10.0.0.255 netmask 255.0.0.0" )
#Linksys 1G
config_eth3=( "10.0.0.1 brd 10.0.0.0.255 netmask 255.0.0.0") |
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cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
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| Posted: Sun Jun 21, 2009 8:10 pm Post subject: |
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| I don't think you need 3 ethernet cards if they are all configured to be on the same subnet. You can do the same thing with just 1 ethernet card. |
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psychoteur
n00b
Joined: 26 Jul 2006
Posts: 34
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| Posted: Mon Jun 22, 2009 7:44 am Post subject: |
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Hi.
I use one ethernet card by floor. It's strange because dnsmasq is supposed to do those king of thing. |
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Anarcho
Advocate
Joined: 06 Jun 2004
Posts: 2970
Location: Germany
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| Posted: Mon Jun 22, 2009 8:33 am Post subject: |
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You can't configure different ethernet cards in the same subnet. The kernel can't decide proparly where to ouput the packets to.
You must configure different subnets, there won't be any other way. Either use something like eth0=10.0.0.1, eth1=10.0.1.1, eth3=10.0.3.1 or if you want all in 10.0.0.x you have to adjust the subnetmask. I would (and have) take the frist approache.
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think4urs11
Bodhisattva
Joined: 25 Jun 2003
Posts: 6659
Location: above the cloud
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| Posted: Mon Jun 22, 2009 10:55 am Post subject: Re: Dnsmasq with three ethernet card |
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| psychoteur wrote: | My /etc/conf.d/net
config_eth0=( "10.0.0.3 brd 10.0.0.255 netmask 255.0.0.0" )
#Dlink Via_Rhine
config_eth1=( "10.0.0.2 brd 10.0.0.255 netmask 255.0.0.0" )
#Linksys 1G
config_eth3=( "10.0.0.1 brd 10.0.0.0.255 netmask 255.0.0.0") |
Your broadcast and netmask don't match.
Either use 10.255.255.255 as broadcast to match the given netmask or change your netmask to 255.255.255.0.
And with the later don't forget to enable routing when the clients connected to the different interfaces need to talk to each other.
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Carnildo
Guru
Joined: 17 Jun 2004
Posts: 595
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| Posted: Tue Jun 23, 2009 1:21 am Post subject: |
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| Anarcho wrote: | You can't configure different ethernet cards in the same subnet. The kernel can't decide proparly where to ouput the packets to.
You must configure different subnets, there won't be any other way. |
Yes, there is: set up a bridge containing the two ethernet cards, and assign an IP address to the bridge. You'll need to emerge the "net-misc/bridge-utils" package, and you may need to configure your kernel to support bridging.
A sample /etc/conf.d/net script, based on the one running on my router:
| Code: |
config_eth1=("null")
config_eth3=("null")
brctl_br0=("stp off")
bridge_br0="eth1 eth3"
config_br0=("192.168.1.1/24") |
This gives you a network device named "br0" that you can use just like you'd use "eth1". |
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psychoteur
n00b
Joined: 26 Jul 2006
Posts: 34
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| Posted: Tue Jun 23, 2009 8:22 am Post subject: |
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Hi again ...
Ok ... I changed my broadcast to 10.255.255.255. No more dhcp on both cards.
I don't have time right now to do full extended tests. I'm a bit in a hurry.
Just a quick question about bridge. If I do a bridge between a 1G card and 100M. The speed will be 100M ?
Thanks. |
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gentoo-dev
Apprentice
Joined: 24 Jan 2006
Posts: 172
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vaguy02
Guru
Joined: 25 Feb 2005
Posts: 424
Location: Hopefully in one place
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| Posted: Wed Jun 24, 2009 11:20 am Post subject: |
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I agree. You need to setup two different subnets with 255.255.255.0 as your netmask. Once you do this, you should be good.
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Carnildo
Guru
Joined: 17 Jun 2004
Posts: 595
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| Posted: Thu Jun 25, 2009 11:25 pm Post subject: |
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| psychoteur wrote: |
Just a quick question about bridge. If I do a bridge between a 1G card and 100M. The speed will be 100M ? |
It'll be 1G on the 1G card and 100M on the 100M card. If you're moving data between the two cards, it'll be 100M because that's how fast the 100M card can accept/supply data. |
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psychoteur
n00b
Joined: 26 Jul 2006
Posts: 34
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| Posted: Sat Jun 27, 2009 9:38 am Post subject: |
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I know what a subnet is.
But I thing it's weird to setup a old computer as home router and then you have to put a switch or different subnet on each card to work in the same network.
Thanks for the information about the bridge.
What I did I had an old switch. I put in it between the floor. So I use only one card. It's more simple for the iptables config too.
But I still have a problem.
When I try to reach a internet address that doesn't contain ""www". I can't get my page.
I disabled the options : "domain-needed and bogus-private".
So I don't see the problem. |
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