Fedora core 6 routing issue - Networking

This is a discussion on Fedora core 6 routing issue - Networking ; Hi. I can't quite figure this one out. We have a dell server with two interfaces. One sits on a public IP and the second on a private one. Routing is enabled and the machine can see the outside world ...

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Thread: Fedora core 6 routing issue

  1. Fedora core 6 routing issue

    Hi.

    I can't quite figure this one out. We have a dell server with two
    interfaces. One sits on a public IP and the second on a private one.
    Routing is enabled and the machine can see the outside world
    correctly.
    What I can't figure out is why machines in the private network, using
    the dell as a gw can't see the outside world. I believe that eth1 and
    eth0 are not forwarding packets correctly but this is not something I
    have seen before.

    Any hints, tips or corrections will be appreciated.
    Details:

    [root@v ~]# ifconfig
    eth0 Link encap:Ethernet HWaddr 00:1A:A0:14:E8:2B
    inet addr:195.220.41.122 Bcast:195.220.41.127 Mask:
    255.255.255.248
    inet6 addr: fe80::21a:a0ff:fe14:e82b/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

    eth1 Link encap:Ethernet HWaddr 00:1A:A0:14:E8:2D
    inet addr:10.0.0.10 Bcast:10.0.0.255 Mask:255.255.255.0
    inet6 addr: fe80::21a:a0ff:fe14:e82d/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

    lo Link encap:Local Loopback
    inet addr:127.0.0.1 Mask:255.0.0.0

    [root@v ~]# cat /proc/sys/net/ipv4/ip_forward
    1

    [root@v ~]# route
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref
    Use Iface
    195.220.41.120 * 255.255.255.248 U 0 0
    0 eth0
    10.0.0.0 * 255.255.255.0 U 0 0
    0 eth1
    default 195.220.41.121 0.0.0.0 UG 0 0
    0 eth0


    Thanks in advance.
    Alex


  2. Re: Fedora core 6 routing issue

    On Jul 9, 1:34 am, MrCAo wrote:

    > What I can't figure out is why machines in the private network, using
    > the dell as a gw can't see the outside world. I believe that eth1 and
    > eth0 are not forwarding packets correctly but this is not something I
    > have seen before.


    It's obvious what the problem is. How do the machines in the outside
    world know to send the reply packets to your dell server? Did you mean
    to configure NAT or something?

    DS


  3. Re: Fedora core 6 routing issue

    On 9 Jul, 10:52, David Schwartz wrote:
    > On Jul 9, 1:34 am, MrCAo wrote:
    >
    > > What I can't figure out is why machines in the private network, using
    > > the dell as a gw can't see the outside world. I believe that eth1 and
    > > eth0 are not forwarding packets correctly but this is not something I
    > > have seen before.

    >
    > It's obvious what the problem is. How do the machines in the outside
    > world know to send the reply packets to your dell server? Did you mean
    > to configure NAT or something?
    >
    > DS


    Hi.
    Thanks for the quick reply.
    Yes, the router would need to NAT

    Alex


  4. Re: Fedora core 6 routing issue

    Continuing from that previous statement, the missing assertion is
    "obviously"

    In case anyone stumps on the same issue:
    http://www.revsys.com/writings/quicktips/nat.html

    Alex


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