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8.6

iptables port forwarding DNAT is not working on

Asked by tballah in IP Tables/IP Chains

Tags: Enterprise Linux Enterprise Linux Server release 4.4 (Carthage), iptables port forwarding

I face a problem that I could not succeed to configure port forwarding on linx box. When I use iptables -L to list the configuration I see only default policy which is "ACCEPT" and I could not see configuration for DNAT i.e. port forwardning that I added. After I added using below command:

[root@gwserver log]# /sbin/iptables -t nat -F
[root@gwserver log]# /sbin/iptables -t nat -A PREROUTING -p tcp -d 10.13.1.17 --dport 8081 -j DNAT --to-destination 192.168.107.50:8081

then I use "iptables -L' I see nothing changed

Could you help configure out and check my configuration? 
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[root@gwserver log]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:1E:0B:62:11:4E  
          inet addr:10.13.1.17  Bcast:10.13.1.255  Mask:255.255.255.0
          inet6 addr: fe80::21e:bff:fe62:114e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2114764278 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2188537282 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2724035159 (2.5 GiB)  TX bytes:3419229934 (3.1 GiB)
          Interrupt:185 Memory:f8000000-f8012100 
 
eth1      Link encap:Ethernet  HWaddr 00:1E:0B:62:11:48  
          inet addr:192.168.105.220  Bcast:192.168.105.255  Mask:255.255.255.0
          inet6 addr: fe80::21e:bff:fe62:1148/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2462218706 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1824303729 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1682170666 (1.5 GiB)  TX bytes:3807574811 (3.5 GiB)
          Interrupt:82 Memory:fa000000-fa012100 
 
[root@gwserver log]# chkconfig --list | grep iptables
iptables        0:off   1:off   2:on    3:on    4:on    5:on    6:off
 
[root@gwserver log]# uname -r
2.6.18-53.el5PAE
 
[root@gwserver log]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
 
Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
 
Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
 
[root@gwserver log]# /sbin/iptables -t nat -F
[root@gwserver log]# /sbin/iptables -t nat -A PREROUTING -p tcp -d 10.13.1.17 --dport 8081 -j DNAT --to-destination 192.168.107.50:8081
[root@gwserver log]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
 
Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
 
Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
[root@gwserver log]#
 
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About this solution

Zone: IP Tables/IP Chains
Tags: Enterprise Linux Enterprise Linux Server release 4.4 (Carthage), iptables port forwarding
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Solution Provided By: Blaz
Participating Experts: 1
Solution Grade: B
 
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