I'm sure this is a very simple routing issue to someone. The
frustrating thing is that I had it figured out the other day, but then
my hard disk crashed today. Now I can't get it right again.
I have a home network of 4 computers. mach1-mach4. It is a 10Base-T
ethernet LAN, and I don't have a hub so here's how I have it set up:
********** mach1 *********
Interfaces:
eth0 == 192.168.1.40
Routing table:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.3.0 192.168.1.41 255.255.255.0 UG 0 0 0 eth0
192.168.2.0 192.168.1.41 255.255.255.0 UG 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
Note:
The reason for the two gateways instead of having a default gateway of
192.168.1.41 is that this machine also has a dialup ppp connection to
the 'net. Therefore, when ppp0 is up, the default gateway is my ISP.
*********** mach2 *********
Interfaces: eth0 == 192.168.1.40; eth1 == 192.168.2.1
Routing table:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.3.0 192.168.2.2 255.255.255.0 UG 0 0 0 eth1
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.1.40 0.0.0.0 UG 0 0 0 eth0
*********** mach3 **********
Interfaces: eth0 == 192.168.2.2; eth1 == 192.168.3.1
Routing table:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.3.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.2.1 0.0.0.0 UG 0 0 0 eth0
************ mach4 *********
Interfaces: eth0 == 192.168.3.2
Routing table:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.3.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.3.1 0.0.0.0 UG 0 0 0 eth0
mach1, mach2, and mach3 all have IP Forwarding enabled (in
/etc/sysctl.conf).
From mach1 and mach2, I can ping all addresses except 192.168.3.2.
From mach3, I can ping every address including 192.168.3.2.
From mach4, I can only ping 192.168.3.1 and 192.168.3.2 (of course,
since that is mach4).
If I try to ping 192.168.3.2 from mach1 or mach2, I don't get any error
messages--it just gets 100% packet loss.
If I try to ping anything outside of the 192.168.3.0 network from mach4,
I get a "Network unreachable" error.
I would greatly appreciate any help. The thing that has changed since I
had it working (yesterday) is mach3. I know I'm forgetting something in
mach3's routing table but I don't see what. Looks like everything
should work to me.
mach{1,2,3} are running Redhat 7.1, and mach4 is running muLinux.
Thanks,
Ben
--
Ben Logan: ben at wblogan dot net
OpenPGP Key KeyID: A1ADD1F0
Bing's Rule:
Don't try to stem the tide -- move the beach.
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