for packet routing puzzle lovers--aka, routing problem
VB
plug-discuss@lists.plug.phoenix.az.us
Tue, 7 May 2002 19:28:33 -0700
>
>
> 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.
>
I have Internet Connection Sharing turned on box b. This is the same as ip
forwarding. It seems like box b knows at least a little bit of what is going
on because box c is able to ping the public ip on box a. therefore, box b
knows how to accept the packet from c, deliever it to a, accept the return
packet from a, and deliver to c. Isn't that right?
> ~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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> >
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> >
>
> --
> ~Jay
>
>
>
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