for packet routing puzzle lovers--aka, routing problem
Jay
plug-discuss@lists.plug.phoenix.az.us
Tue, 7 May 2002 18:13:40 -0700 (MST)
Hi Eric. I didn't look at your specific routing tables below, and I don't
know the first thing about Windows...
However, I'm willing to bet that your problem is "Computer B" (your
windows machine) does not have IP forwarding turned on (for both
interfaces). More than likely, that's the root of your problems.
~Jay
On Tue, 7 May 2002, Eric wrote:
> This stuff is supposed to be basic but it gets confusing. Could someone
> help me understand a routing problem? I very much appreciate it; I know
> there are lots of characters on this page. But this problem is preventing
> me from scp'ing from my firewall (computer C) to fileserver (computer A),
> which is what I need to do.
>
> Topology
>
> Computer A (e-smith)
> eth1 public ip
> eth0 10.0.0.1
>
> Computer B (w2K)
> 10.0.0.2
> 192.168.0.1
>
> Computer C (rh7.1)
> 192.168.0.10
>
> Computers A and C are obviously separated by computer B.
>
> PROBLEM:
>
> Computer A can ping only 10.0.0.2 and public IP's, but not anything on
> 192.168.0.x.
> Computer B can ping everything.
> Computer C can ping anything on 192.168.0.x and any public IP, but
> **cannot** ping any 10.0.0.x.
>
> **So in essence, A cannot reach C, and C cannot reach A.
>
> I told computer C how to get to A, and A how to get to C, and B how to get
> to A and C. But it doesn't work. What am I doing wrong.
>
> Here are the routing tables:
>
> ***Computer A
> Kernel IP routing table
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> Iface
> 10.0.0.0 * 255.255.255.0 U 0 0 0 eth0
> 192.168.0.0 pc-0002 255.255.255.0 UG 0 0 0 eth0
> 226.4.216.0 * 255.255.255.0 U 0 0 0 eth1
> 127.0.0.0 * 255.0.0.0 U 0 0 0 lo
> default 226-4-216-1.ge 0.0.0.0 UG 0 0 0 eth1
>
>
> ("pc-0002" showed up after I did "route add -net 192.168.0.0/24 gw
> 10.0.0.2".)
>
>
> ***Computer B
> Active Routes:
> Network Destination Netmask Gateway Interface Metric
> 0.0.0.0 0.0.0.0 10.0.0.1 10.0.0.2 1
> 10.0.0.0 255.255.255.0 10.0.0.2 10.0.0.2 1
> 10.0.0.0 255.0.0.0 192.168.0.2 192.168.0.1 1
> 10.0.0.2 255.255.255.255 127.0.0.1 127.0.0.1 1
> 10.255.255.255 255.255.255.255 10.0.0.2 10.0.0.2 1
> 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
> 192.168.0.0 255.255.255.0 192.168.0.1 192.168.0.1 1
> 192.168.0.0 255.255.255.0 10.0.0.2 10.0.0.2 1
> 192.168.0.1 255.255.255.255 127.0.0.1 127.0.0.1 1
> 192.168.0.255 255.255.255.255 192.168.0.1 192.168.0.1 1
> 224.0.0.0 224.0.0.0 10.0.0.2 10.0.0.2 1
> 224.0.0.0 224.0.0.0 192.168.0.1 192.168.0.1 1
> 255.255.255.255 255.255.255.255 10.0.0.2 10.0.0.2 1
> Default Gateway: 10.0.0.1
> ===========================================================================
> Persistent Routes:
> Network Address Netmask Gateway Address Metric
> 10.0.0.0 255.0.0.0 192.168.0.2 1
>
>
>
>
> ***Computer C
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> Iface
> 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
> 10.0.0.0 192.168.0.1 255.0.0.0 UG 0 0 0 eth0
> 127.0.0.0 * 255.0.0.0 U 0 0 0 lo
> default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
>
>
>
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--
~Jay