Simple Routing using FC2/3
crhea at mayo.edu
Mon Mar 7 05:53:52 UTC 2005
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 at 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 at 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 at Mayo.EDU Rochester, MN 55905
(507) 284-0587 Fax: (507) 284-5231
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