Dear all,
   Thanks very much for your kindly help! I use below codes to update the 
firewall, and it works now.
  
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat  -A PREROUTING -d 192.168.1.250 -p tcp -m tcp --dport 8080 -j 
DNAT --to-destination a.b.c.d:8181
iptables -t nat -A POSTROUTING -d a.b.c.d -p tcp --dport 8181 -j SNAT 
--to-source 192.168.1.250



At 2011-06-27,"John R Pierce" <pie...@hogranch.com> wrote:

>On 06/27/11 12:05 AM, muiz wrote:
>> [root@localhost ~]# /sbin/iptables -L
>
>note that doesn't show all the pertinent info. I prefer `iptable -L 
>-vn`, and it still doesn't show the nat tables, you also need `iptable 
>-L -vn -t nat` to see those chains, and `iptable -L -vn -t mangle` if 
>you're using any mangle entries.
>
>
>
>-- 
>john r pierce                            N 37, W 122
>santa cruz ca                         mid-left coast
>
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