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This is the network topology I'm working with:

  |      |
  |Modem |
    |  |                .______.
    |  `----------------|      |
    |                   |Box A |
    |        .______.   |______|
    `--------|      |   
             |      |
             |Box B |

route on Box A returns:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         UG    0      0        0 eth0        *        U     0      0        0 eth0

route on Box B returns:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface     *        U     0      0        0 eth0
default         UG    0      0        0 eth0

Question is: How can I access Box B from Box A?

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You will need to tell the modem that requests for should not be dropped, but should be dispatched to the second router.

How you do that is rather hard to tell without knowing what kind of device it actually is, but it might involve something like route add -net netmask via_interface#. (Or it could be web based).

To learn what that does, see this post on our sistersite.

share|improve this answer
Thanks for the link, I am going through it now. Modem and router are simple commodity network appliances, I can only configure them via web based UIs. It appears that I can add a 'static route' on my modem but it doesn't seem to work, I get this on box A: ping PING ( 56(84) bytes of data. From icmp_seq=2 Redirect Host(New nexthop: – Hamza Sep 8 '13 at 17:17
I suspect the modem is just behaving as a switch and you don't need to do anything special to to it, however the router either needs a special route set up if possible or if you are only attempting to access one computer behind it some kind of port forwarding, then Box A would just connect to whenever it wanted to talk to Box B. – Scott Chamberlain Sep 8 '13 at 17:48

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