Help needed for a box with 4 Ethernet Interfaces

Dave Johnson davejohnson_hifi at yahoo.com
Thu Aug 4 19:15:07 CEST 2005


Sorry for the confusion. Box A and B have 2 interfaces. 
Here is updated diagram.
                                                                         ------------
                                            -----------------------------|  Box D   |
                              172.16.6.10   |                            |          |
         Mgmt Port<---------------------|   |                            ------------
                                        |   | 192.168.0.1                 192.168.0.2
                                   Eth0 |   | Eth1 (for internal network)
 ------------                        ------------                        ------------
 |  Box A   |10.1.1.1 _______________|  Box B   |_____________21.21.21.1_|  Box C   |
 |          |                    Eth2|          | Eth3                   |          |
 ------------     10.1.1.0/24        ------------       21.21.21.9/24    ------------         
 
  192.168.0.1                         192.168.0.3                         192.168.0.2



--- Eduardo Spremolla <edspremolla at antel.com.uy> wrote:

> You can't have Box A with ip 192.168.0.1 on a 10.1.1.0/24 subnet, the
> same goes for Box C. They need ip in the subnet range.
> After that we may start to talk about roouting.
> 
> 
> LALO
> 
> On Thu, 2005-08-04 at 09:11 -0700, Dave Johnson wrote:
> > Hi All:
> > I need help to setup my box with some complicated configuration.
> > 
> > I have a box with 4 Ethernet Interfaces:
> > 
> > Eth0: 172.16.6.10
> > Eth1: 192.168.0.1/24
> > Eth2: 10.1.1.0/24      ------> Connected to a box A with an IP address of 192.168.0.2
> > Eth2: 21.21.21.9/24    ------> Connected to a box C with an IP address of 192.168.0.1 (which
> is
> > same as IP address of Eth1)
> > 
> > Loopback Interface: 192.168.0.3
> >                                                                          ------------
> >                                             -----------------------------|  Box D   |
> >                               172.16.6.10   |                            |          |
> >          Mgmt Port<---------------------|   |                            ------------
> >                                         |   | 192.168.0.1                 192.168.0.2
> >                                    Eth0 |   | Eth1 (for internal network)
> >  ------------                        ------------                        ------------
> >  |  Box A   |________________________|  Box B   |________________________|  Box C   |
> >  |          |                    Eth2|          | Eth3                   |          |
> >  ------------     10.1.1.0/24        ------------       21.21.21.9/24    ------------         
>    
> >   192.168.0.1                         192.168.0.3                         192.168.0.2
> > 
> > Here is what I want to do:
> > Packets from Eth2 should only go to Eth3 except the ones detined to Eth0's IP.
> > Packets from Eth3 should only go to Eth2 except the ones detined to Eth0's IP.
> > Local packets destined for Eth1's ip and its subnet should be forwarded via Eth1 only.
> > Packets from Eth1 can only be directed to Eth0. 
> > 
> > This will allow me to ping Box A (192.168.0.1) from Box C (192.168.0.2) without getting a
> response
> > from Box B who has local interface with address 192.168.0.1.
> > 
> > Basically I want to isolate interfaces in 2 groups:
> > One with Eth0, Eth2 and Eth3
> > Second with Eth0 and Eth1.
> > 
> > I tried IPtables and multiple routing tables but it did not work. I think I need some
> directions
> > as to how would this even be possible.
> > 
> > Thanks
> > 
> > Dave.
> > 
> > 
> > 
> > __________________________________________________
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> 
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