Re: Simple Routing using FC2/3

From: Cris Rhea (crhea_at_mayo.edu)
Date: 03/07/05

  • Next message: Ankush Grover: "Fwd: How to recovery deleted files?" 
    Date: Sun, 6 Mar 2005 23:53:52 -0600
To: Les Mikesell <les@futuresource.com>

    On Sun, Mar 06, 2005 at 11:09:46PM -0600, Les Mikesell wrote:
    > On Sun, 2005-03-06 at 22:06, Todd Wohlwend wrote:
    > > This silly routing thing is driving me buzzonkers. I did have a typo in my
    > > first email concerning the gateway address of the LAN PC. The PC was
    > > configured correctly. Here are the correct stats and output.
    > >
    > > FC3 Soon to be Router Box : (dns-172.16.176.72)
    > > eth1 - ip-172.16.176.153, snm-255.255.240.0, gw-172.16.176.1
    > > eth0 - ip-192.168.213.254, snm-255.255.255.0, gw-blank
    > >
    > > PC tied to FC3 eth0 NIC via crossover cable : (dns-172.16.176.72)
    > > eth0 - ip-192.168.213.253, snm-255.255.255.0, gw-192.168.213.254
    > >
    > > Router box route command.
    > > [root@FC3-dt ~]# route
    > > Kernel IP routing table
    > > Destination Gateway Genmask Flags Metric Ref Use
    > > Iface
    > > 192.168.213.0 * 255.255.255.0 U 0 0 0 eth0
    > > 172.16.176.0 * 255.255.240.0 U 0 0 0 eth1
    > > 169.254.0.0 * 255.255.0.0 U 0 0 0 eth1
    > > default 172.16.176.1 0.0.0.0 UG 0 0 0 eth1
    > >
    > > /etc/sysctl.conf routing section
    > > # Controls IP packet forwarding
    > > net.ipv4.ip_forward = 1
    > >
    > > >From the PC, I can ping itself of course, 192.168.213.254, and
    > > 172.16.176.153. I cannot ping anything else on the 172 network. (Note :
    > > The Router Box can ping all devices in the 172 network)
    >
    > If you don't NAT, the boxes on the 172 net must have a reason to route
    > the 192.168.213.x addresses back to your router box. If it isn't
    > their default gateway you need to add a route back in the router that
    > is their default gateway. If this isn't possible, you should add
    > NAT on the router box you are describing so all of the 192.168.213.x net
    > will appear on the other side as 172.16.178.153.
    >
    > --
    > Les Mikesell
    > les@futuresource.com

    IMHO, this isn't about (or related to NAT). This is simple IP routing between
    two private networks.

    The information above looks fine... There's something missing...

    Do a "cat /proc/sys/net/ipv4/ip_forward" and see what it returns...
    Do an "iptables --list" and see what it returns.

    What Todd is describing above I've done bunches of times. There should be no
    magic in doing this in FC2/3 (or any other Linux/RH version). 

    -- 
 Cristopher J. Rhea                     Mayo Foundation
 Research Computing Facility             Pavilion 2-25
 crhea@Mayo.EDU                        Rochester, MN 55905
 (507) 284-0587                        Fax: (507) 284-5231
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