[CentOS] BQ/CentOS port forwarding

Ashton, Jeremy - Workstream Inc. Jeremy.Ashton at WorkStreamInc.com
Wed Jun 20 16:51:14 UTC 2007


What happens when you try the following?

iptables -t nat -A PREROUTING -I eth1 -d 69.54.130.16 -p tcp -m tcp
--dport 25 -j DNAT --to-destination 10.10.10.12

Can we get an output of your iptables?

"iptables -L -nv --line-numbers"

-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
Behalf Of Charles Sliger
Sent: Wednesday, June 20, 2007 12:21 PM
To: 'CentOS mailing list'
Subject: RE: [CentOS] BQ/CentOS port forwarding

Here is the corresponding command from my iptables script:

EXTDEV=eth1
EXTIP=69.54.130.16
SMTPIP=10.10.10.12
$IPT -t nat -A PREROUTING -i $EXTDEV -p tcp -d $EXTIP --dport 25 \
     -j DNAT --to-destination $SMTPIP

-chaz

Charles L. Sliger,  Information Systems Engineer chaz at bctonline.com
{Yahoo: chaz_sliger}  {Google: chaz.sliger}

> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On 
> Behalf Of Richard Veale
> Sent: Friday, June 15, 2007 1:38 PM
> To: 'CentOS mailing list'
> Subject: RE: [CentOS] BQ/CentOS port forwarding
> 
> I tried to set up IPtables for it using:
> 
> iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 3389 -j DNAT \ 
> --to 10.0.0.100
> 
> but the 'to' statement does not seem to work on my CentOS box and 
> every time I do anything to IPtables my DNS blows up.
> 
> Richard
> 
> 
> 
> 
> 
> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On 
> Behalf Of Richard Veale
> Sent: Friday, June 15, 2007 8:32 AM
> To: 'CentOS mailing list'
> Subject: RE: [CentOS] BQ/CentOS port forwarding
> 
> Thanks Robert,
> I have a Terminal Services Server that will be behind the inside 
> interface, I need to forward hits on port 3389 eth1 to an IP address 
> behind eth0.
> 
> Richard Veale
> 
> 
> 
> 
> 
> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On 
> Behalf Of Robert Spangler
> Sent: Thursday, June 14, 2007 10:31 PM
> To: CentOS mailing list
> Subject: Re: [CentOS] BQ/CentOs port forwarding
> 
> On Thu June 14 2007 18:06, Richard Veale wrote:
> 
> >  Just bought a new BQ/CentOS box with full NuOnce load (Linux 
> > 2.6.9-55.ELsmp, gcc 3.4.6, Red Hat 3.4.6-8, Apache 2.0.52, BQ 
> > 5102r), to replace my old Qube 3 pro, I have NAT setup (eth0 = 
> > inside, eth1 =
> outside)
> > but need to get port forwarding going. What is the best way?
> 
> Well it depends on what you are trying to forward  But to turn on 
> forward in
> 
> general use this;
> 
> /bin/echo 1 >/proc/sys/net/ipv4/ip_forward
> 
> 
> --
> 
> Regards
> Robert
> 
> Smile... it increases your face value!
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> 
> 
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