Hello, everybody:
I am experiencing a problem with network routing, I hope some of you can
help me... Let me explain my problem to you:
I have two lan segments: LAN "A" (215.192.10.0/255.255.255.0) and
LAN "B" (216.192.10.0/255.255.255.0)
I have three Linux boxes: all of them with Red Hat Linux 5.2,
Kernel 2.0.36.
The box #1 has one ethernet adapter and participates on LAN "A";
The box #2 has TWO ethernet adapters and participates on both LANs: "A" and
"B";
The box #3 has one ethernet adapter and participates on LAN "B";
So, box #2 is the router between LANs "A" and "B".
I have configured (properly ???) all routing tables and firewall policies (see
the outputs below); box #1 can successfully ping box #2 at its LAN "B"
address;
box #3 can successfully ping box #2 at its LAN "A" address but BOX #1 CAN NOT
PING BOX #3 AT ALL.
+------------------------+
| Box #1 |
| eth0: LAN A |--+
| IP 215.192.10.1 | |
+------------------------+ |
| LAN segment "A"
+------------------------+ |
| Box #2 | |
| eth0: LAN A |--+
| IP 215.192.10.15 |
| eth1: LAN B |--+
| IP 216.192.10.15 | |
+------------------------+ |
| LAN segment "B"
+------------------------+ |
| Box #3 | |
| eth0: LAN B |--+
| IP 216.192.10.1 |
+------------------------+
Am I doing something wrong? I have made EXACTLY this same configuration on
IBM/AIX boxes, and everything worked fine.
Thanks in advance,
Hime
============ Routing table at box #1 ============
[root@mor7 /root]# route -n
Kernel IP routing table
Destination Gateway
Genmask Flags Metric Ref Use Iface
215.192.10.0
0.0.0.0 255.255.255.0 U 0 0 11449 eth0
216.192.10.0
215.192.10.15 255.255.255.0 UG 0 0 2 eth0
127.0.0.0
0.0.0.0 255.0.0.0 U 0 0 14 lo
============ Routing table at box #3 ============
[root@treinamento /root]# route -n
Kernel IP routing table
Destination
Gateway Genmask Flags Metric Ref Use Iface
216.192.10.0
0.0.0.0 255.255.255.0 U 0 0 4 eth0
215.192.10.0
216.192.10.15 255.255.255.0 UG 0 0 9 eth0
127.0.0.0
0.0.0.0 255.0.0.0 U 0 0 1 lo
============ Routing table and firewall policies at box #1 ============
[root@per1 /root]# route
Kernel IP routing table
Destination Gateway
Genmask Flags Metric Ref Use Iface
215.192.10.0 *
255.255.255.0 U 0 0 7 eth0
216.192.10.0 *
255.255.255.0 U 0 0 6 eth1
127.0.0.0 *
255.0.0.0 U 0 0 2 lo
[root@per1 /root]# ipfwadm -F -l
IP firewall forward rules, default policy:
accept
[root@per1 /root]# ipfwadm -O -l
IP firewall output rules, default policy:
accept
[root@per1 /root]# ipfwadm -I -l
IP firewall input rules, default policy:
accept
I had also tried with the following firewall policies
[root@per1 /root]# ipfwadm -F -l
IP firewall forward rules, default policy:
accept
type prot source destination ports
acc all
anywhere anywhere n/a
[root@per1 /root]# ipfwadm -I -l
IP firewall input rules, default policy:
accept
type prot source destination ports
acc all
anywhere anywhere n/a
[root@per1 /root]# ipfwadm -O -l
IP firewall output rules, default policy:
accept
type prot source destination ports
acc all
anywhere anywhere n/a
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