Firewall Ripv2(if0) ---- (if5)Router 1 RipV2 ------ Router 2 RipV2-|Router3 3.251--3.202 |------Switch------| Firewall eth0 : 192.168.10.1 eth1 : XXX.XXX.XXX.XXX Router 1 eth0 : 192.168.0.250 eth1 : 192.168.1.250 eth2 : 192.168.2.250 eth3 : 192.168.11.250 eth4 : 192.168.56.250 eth5 : 192.168.10.10 Router 2 ( eth0-5 all bridged) bridge : 192.168.0.250 bridge:1 : 192.168.1.250 bridge:2 : 192.168.2.250 bridge:3 : 192.168.4.250 bridge:4 : 192.168.56.250 All routers are connected via wireless. Router 2 can ping 192.168.3.251 Router 2 can ping 192.168.3.202 (client behind router 3) Router 1 can ping 192.168.3.251 Router 1 cannot ping 192.168.3.202 Firewall can ping 192.168.3.251 Firewall cannot ping 192.168.3.202 If 192.168.3.202 pings firewall 192.168.10.1 , then firewall can from then on ping 192.168.3.202 Firewall Routing Table Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface XXX.XXX.XXX.XXX * 255.255.255.240 U 0 0 0 eth1 192.168.4.0 192.168.10.10 255.255.255.0 UG 3 0 0 eth0 192.168.3.0 192.168.10.10 255.255.255.0 UG 3 0 0 eth0 192.168.2.0 192.168.10.10 255.255.255.0 UG 2 0 0 eth0 192.168.1.0 192.168.10.10 255.255.255.0 UG 2 0 0 eth0 192.168.0.0 192.168.10.10 255.255.255.0 UG 2 0 0 eth0 192.168.11.0 192.168.10.10 255.255.255.0 UG 2 0 0 eth0 192.168.10.0 * 255.255.255.0 U 0 0 0 eth0 192.168.56.0 192.168.10.10 255.255.255.0 UG 2 0 0 eth0 192.168.57.0 192.168.10.10 255.255.255.0 UG 3 0 0 eth0 169.254.0.0 * 255.255.0.0 U 0 0 0 eth1 default 217.26.69.254 0.0.0.0 UG 0 0 0 eth1 Router 1 Routing Table [root@anakin ~]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.4.0 192.168.11.251 255.255.255.0 UG 2 0 0 eth3 192.168.3.0 192.168.1.251 255.255.255.0 UG 2 0 0 eth1 192.168.2.0 * 255.255.255.0 U 0 0 0 eth2 192.168.1.0 * 255.255.255.0 U 0 0 0 eth1 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0 192.168.11.0 * 255.255.255.0 U 0 0 0 eth3 192.168.10.0 * 255.255.255.0 U 0 0 0 eth5 192.168.56.0 * 255.255.255.0 U 0 0 0 eth4 192.168.57.0 192.168.1.251 255.255.255.0 UG 2 0 0 eth1 169.254.0.0 * 255.255.0.0 U 0 0 0 eth5 default 192.168.10.1 0.0.0.0 UG 0 0 0 eth5 Router 2 Routing table [root@vader ~]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.4.0 * 255.255.255.0 U 0 0 0 bridge 192.168.3.0 192.168.1.251 255.255.255.0 UG 2 0 0 bridge 192.168.2.0 * 255.255.255.0 U 0 0 0 bridge 192.168.1.0 * 255.255.255.0 U 0 0 0 bridge 192.168.0.0 * 255.255.255.0 U 0 0 0 bridge 192.168.11.0 * 255.255.255.0 U 0 0 0 bridge 192.168.10.0 192.168.0.250 255.255.255.0 UG 2 0 0 bridge 192.168.56.0 * 255.255.255.0 U 0 0 0 bridge 192.168.57.0 192.168.1.251 255.255.255.0 UG 2 0 0 bridge 169.254.0.0 * 255.255.0.0 U 0 0 0 lo default 192.168.1.250 0.0.0.0 UG 0 0 0 bridge Router 3 Routing table [root@tifa ~]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.4.0 192.168.1.250 255.255.255.0 UG 3 0 0 eth0 192.168.3.0 * 255.255.255.0 U 0 0 0 eth1 192.168.2.0 192.168.1.250 255.255.255.0 UG 2 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0 192.168.0.0 192.168.1.250 255.255.255.0 UG 2 0 0 eth0 192.168.11.0 192.168.1.250 255.255.255.0 UG 2 0 0 eth0 192.168.10.0 192.168.1.250 255.255.255.0 UG 2 0 0 eth0 192.168.56.0 192.168.1.250 255.255.255.0 UG 2 0 0 eth0 192.168.57.0 * 255.255.255.0 U 0 0 0 eth2 169.254.0.0 * 255.255.0.0 U 0 0 0 eth2 default 192.168.1.249 0.0.0.0 UG 0 0 0 eth0