[CentOS] Routing problem

Marc Breslow

marc at radiusIM.com
Tue Jul 18 15:54:54 UTC 2006


Hi,


I'm building a firewall/router on Centos.  I'm using Shorewall but have
currently stopped and cleared the firewall rules to isolate the routing
problem.

 

My firewall box has 5 interfaces in it but currently only two are involved
in the problem.  

 

eth1: inet addr:192.168.1.224  Bcast:192.168.1.255  Mask:255.255.255.0

eth3: inet addr:192.168.202.1  Bcast:192.168.202.255  Mask:255.255.255.0

 

eth1 is connected to a switch that is connected to a router.  The router is
192.168.1.1 and is the internet gateway.

eth3 is connected to a different switch.



I have another Centos box that is connected to the switch shared with eth3.
It's interface is:

eth3: inet addr:192.168.202.10  Bcast:192.168.202.255  Mask:255.255.255.0

 

I want to provide internet connectivity to this 2nd machine routed through
the firewall.  Currently, I can reach two machines on the 192.168.1.0/24
network (.5 and .3) but I can't reach the router (.1) or anything outside.

 

I'll paste the routing tables from both machines below.  Thanks in advance
for your help.

 

---Marc

 

Firewall routing tables:

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface

10.0.0.0        0.0.0.0         255.255.255.254 U     0      0        0 eth4

192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1

192.168.202.0   0.0.0.0         255.255.255.0   U     0      0        0 eth3

169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth4

0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth1

 

192.168.202.10 routing table:

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface

192.168.202.0   0.0.0.0         255.255.255.0   U     0      0        0 eth1

10.1.16.0       0.0.0.0         255.255.240.0   U     0      0        0 eth0

169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0

0.0.0.0         192.168.202.1   0.0.0.0         UG    0      0        0 eth1

 

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