Packet getting dropped using iptables
I use Fedora Core 3 and I am connected to the internet via DSL. My computer has two lan cards - One for the intenet connection - and one that I use to connect my Laptop.
I configured iptables to act as router but I am unable to connect to the internet from my Laptop.
The steps I took -
1) Enabled IP forwarding - echo 1 > /proc/sys/net/ipv4/ip_forward
2) iptables configuration -
./iptables -t nat -A POSTROUTING --out-interface eth0 -j MASQUERADE
./iptables -A FORWARD --in-interface eth1 -j ACCEPT
I even switched to using the ip addresses of my cards
./iptables -t nat -A POSTROUTING --out 172.16.15.5 -j MASQUERADE
./iptables -A FORWARD --in-interface 18.104.22.168 -j ACCEPT
3) I switched on logging-
./iptables -A INPUT -j LOG --log-prefix "INPUT_DROP: "
./iptables -A OUTPUT -j LOG --log-prefix "OUTPUT_DROP: "
4) I set up route -
./route add default gw 172.16.0.1 dev eth0
./route add -net 192.168.0.0 netmask 255.255.255.0 gw 172.16.0.1 dev eth0
But I am unable to connect to the net from my Laptop (Using WIndows XP)
I checked the logs and this is what I find.
Feb 2 14:11:01 server kernel: INPUT_DROP: IN=eth1 OUT= MAC=00:e0:4c:04:71:46:00:c0:9f:94:a4:17:08:00 SRC=192.168.0.2 DST=192.168.0.1 LEN=68 TOS=0x00 PREC=0x00 TTL=128 ID=319 PROTO=UDP SPT=1040 DPT=53 LEN=48
Why is this happening?