[LARTC] Router

[LARTC] Router

[Rimas]

Hi guys,

I'm asking the same question again (it's very urgent for me).

How to build a router on Linux box?

I have a Linux box (Redhat 7.3) with two network cards.
eth0 is connection to my wireless ISP and eth1 to my FWs.
I want to route eth0<-->eht1. Both NIC have real Internet IP as well like
FWs.
I need no NAT (no needs to hide my real IP, because it have to be seen from
Internet).
Do I have to use ip route or iptables or combination of it.

Thank you

Rimas




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Re: [LARTC] Router

[David Boreham]

 
> How to build a router on Linux box?

This is a bit like asking 'How do I build a nuclear reactor, I need to
have it done by monday' :)

You will need to sit down and do quite a bit of reading.
There are howto documents, there are books on the subject,
there are mailing lists like this. You'll need to spend time with
all three types of information source.

The book "Linux Firewalls", despite the title, is a good
source of informaiton on routing with Linux.

The book "Linux Routing" is also good.





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Re: [LARTC] Router

[Stef Coene]

On Friday 22 November 2002 16:08, Rimas wrote:
> Hi guys,
>
> I'm asking the same question again (it's very urgent for me).
>
> How to build a router on Linux box?
>
> I have a Linux box (Redhat 7.3) with two network cards.
> eth0 is connection to my wireless ISP and eth1 to my FWs.
> I want to route eth0<-->eht1. Both NIC have real Internet IP as well like
> FWs.
> I need no NAT (no needs to hide my real IP, because it have to be seen from
> Internet).
> Do I have to use ip route or iptables or combination of it.
If the box is up and running with 2 nic's configured, try this :

echo 1 > /proc/sys/net/ipv4/ip_forward

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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Re: [LARTC] Router

[Ashok N N]

On Friday 22 November 2002 10:33 am, Stef Coene wrote:
> On Friday 22 November 2002 16:08, Rimas wrote:
> > Hi guys,
> >
> > I'm asking the same question again (it's very urgent for me).
> >
> > How to build a router on Linux box?
> >
> > I have a Linux box (Redhat 7.3) with two network cards.
> > eth0 is connection to my wireless ISP and eth1 to my FWs.
> > I want to route eth0<-->eht1. Both NIC have real Internet IP as well like
> > FWs.
> > I need no NAT (no needs to hide my real IP, because it have to be seen 
from
> > Internet).
> > Do I have to use ip route or iptables or combination of it.
> If the box is up and running with 2 nic's configured, try this :
> 
> echo 1 > /proc/sys/net/ipv4/ip_forward
> 
> Stef
> 

Just to enable routing (without any firewall stuff) the above command would be 
sufficient. To make it permanent, add the following to /etc/sysctl.conf:
# Enables packet forwarding
net.ipv4.ip_forward=1

You could also add the following to enable route verification:
# Enables source route verification
net.ipv4.conf.default.rp_filter = 1

Thanks,
Ashok
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