CentOS - Jun 2016 - Redirecting port 8080 to port 80 - how to add in /etc/sysconfig/iptables file?

Hello again,

unfortunately the following /etc/sysconfig/iptables file does not work:

*nat
:INPUT ACCEPT
:OUTPUT ACCEPT
:PREROUTING ACCEPT
:POSTROUTING ACCEPT
#-A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
-A PREROUTING -p tcp -m tcp -d 144.76.184.154/32 --dport 80 -j REDIRECT
--to-ports 8080
COMMIT

*filter
:INPUT DROP
:OUTPUT ACCEPT
:FORWARD DROP
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
-A INPUT -p tcp -m tcp -m state --state NEW -m multiport --dports
25,80,443,8080 -j ACCEPT
-A INPUT -p tcp -m tcp -m state --state NEW --dport 22 --tcp-flags
FIN,SYN,RST,ACK SYN -m limit --limit 2/min --limit-burst 1 -j ACCEPT
COMMIT

I need incoming HTTP-connections to 144.76.184.154:80
to be redirected to 144.76.184.154:8080 (where Jetty is listening
as user "nobody"), but for some reason this does not happen.

When I browse to http://144.76.184.154:8080 then I see Jetty response.

But when I browse to http://144.76.184.154 nothing is returned.

Can anybody please spot the error for me?

Thank you
Alex

On 06/21/2016 02:30 AM, Alexander Farber wrote:
> -A PREROUTING -p tcp -m tcp -d 144.76.184.154/32 --dport 80 -j REDIRECT
> --to-ports 8080

I think you have the ports backward, here.

Hello Gordon and others

On Tue, Jun 21, 2016 at 4:13 PM, Gordon Messmer <gordon.messmer at
gmail.com>
wrote:
> On 06/21/2016 02:30 AM, Alexander Farber wrote:
>
>> -A PREROUTING -p tcp -m tcp -d 144.76.184.154/32 --dport 80 -j REDIRECT
>> --to-ports 8080
>>
>
>
> I think you have the ports backward, here.
>
here the problem description again:

I have Jetty running as user "nobody" at the port 8080.

I need to redirect incoming HTTP requests to port 80 to the above port.

(So I don't think I have ports backwards).

Here is my current /etc/sysconfig/iptables:

*filter
:INPUT ACCEPT
:OUTPUT ACCEPT
:FORWARD ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
-A INPUT -p tcp -m tcp -m state --state NEW -m multiport --dports
25,80,443,8080 -j ACCEPT
-A INPUT -p tcp -m tcp -m state --state NEW --dport 22 --tcp-flags
FIN,SYN,RST,ACK SYN -m limit --limit 2/min --limit-burst 1 -j ACCEPT
-A FORWARD -p tcp -m tcp --dst 144.76.184.154 --dport 8080 -j ACCEPT
COMMIT

*nat
:INPUT ACCEPT
:OUTPUT ACCEPT
:PREROUTING ACCEPT
:POSTROUTING ACCEPT
-A PREROUTING -p tcp --dst 144.76.184.154 --dport 8080 -j REDIRECT
--to-port 80
COMMIT

And here is my /etc/sysctl.conf:

net.ipv4.ip_forward=1
net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1

Unfortunately, the redirect does not work:

When I browse to my site port 8080, I see Jetty.

When I browse to my site port 80, connection is refused.

Here I print the tables:

#  iptables -t filter -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere             state
RELATED,ESTABLISHED
ACCEPT     all  --  anywhere             anywhere
ACCEPT     icmp --  anywhere             anywhere             icmp any
ACCEPT     tcp  --  anywhere             anywhere             tcp state NEW
multiport dports smtp,http,https,webcache
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ssh
flags:FIN,SYN,RST,ACK/SYN state NEW limit: avg 2/min burst 1

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             afarber.de           tcp
dpt:webcache

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

# iptables -t nat -L
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination
REDIRECT   tcp  --  anywhere             afarber.de           tcp
dpt:webcache redir ports 80

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination

Please help
Alex