Mailinglist Archive: opensuse (3964 mails)

[Stan Glasoe <SRGlasoe@xxxxxxxxxxx>]

On Saturday 06 November 2004 2:11 pm, Don Parris wrote:
> I'm trying to setup two NICs on one box, and seem to be having
> trouble eaching the rest of the LAN using eth1.  I use eth0 for the
> DSL connection.
>
> ifconfig reports:
> dsl0      Link encap:Point-to-Point Protocol
>           inet addr:192.168.99.1  P-t-P:192.168.99.99 
>
> eth0      Link encap:Ethernet  HWaddr 00:0A:E6:68:3E:24
>           inet addr:192.168.1.3  Bcast:192.168.1.255 
> Mask:255.255.255.0 
>
> eth1      Link encap:Ethernet  HWaddr 00:01:02:73:CA:CF
>           inet addr:192.168.1.2  Bcast:192.168.1.255 
> Mask:255.255.255.0 
>
> ping -I 192.168.1.2  192.168.1.14 produces "host unreachable".
>
> I've tried 2 different NICs.  I suspect the problem is not dead NICs
> but perhaps something I need to do differently or additionally.  I've
> setup the hosts file with both NICs listed (and tried it with only
> eth1's address listed - 192.168.1.2)  I'm not quite sure what else to
> do.
>
> Thanks,
> Don
>

How are these NICs cabled? Does eth0 go directly to dsl0? Does eth1 go 
to a physically separate LAN through an ethernet switch that 
192.168.1.14 is also plugged into? Is dsl0 an external DSL modem or is 
it internal to the PC? Where is the DHCP server or does everything have 
static IP addresses?

Set eth0 and eth1 to different subnets such as eth0=192.168.?.x/24 and 
eth1=192.168.1.x/24. This is where its nice to have a DHCP server 
serving the rest of your 192.168.1.x/24 network since everything else 
that eth1 connects to is already at 192.168.1.x/24. 

What I did was to set eth0 as the external/Internet device at  
192.168.1,x connecting to my broadband router which has a minimal 
firewall and NAT and DHCP server (which would be serving to only one 
device, eth0). The router talks to the DSL/Cable modem. Then eth1 as 
the internal/LAN device talks to the rest of the LAN on 192.168.2.x and 
does caching DNS, DHCP server, Squid proxy, Shorewall firewall and 
other security things.

There are some other details to check but lets get the basic plumbing 
straight first...

Stan