Simple Routing using FC2/3

[Todd Wohlwend]

This should be a simple task.  I need to use a FC2/3 as a router.  (I have 
done this in RH7.2 with no problems)  Here is my senerio :

Fedora C3 (soon to be router - I hope)
External Interface 172.16.176.152 / 20
Internal Interface 192.168.213.152 / 24
No GW on internal
net.ipv4.ip_forward = 1 set in sysctl.conf file (rebooted of-course)

Internal PC
IP = 192.168.213.253 / 24
GW = 192.168.213.254

I can ping the 192.168.213.254 and 172.16.176.152 from the internal PC, but 
not any device in the 172.17.176 network.

This is a full install of FC3.  iptables is default.  I have even disabled 
iptables to test. Still no luck.........I need a simple solution.  I do not 
want to disable iptables and install another product.....like firestarter or 
enable (masquerading) NAT.

There must be a simple solution?

Todd Wohlwend
Computer Information Systems Instructor
Southeast Technical Institute
[e-mail] or [e-mail]

[Justin Zygmont]

Do you have the external interface set as default gateway device?  You're 
also going to need NAT if you plan to route through it.

On Sun, 6 Mar 2005, Todd Wohlwend wrote:
> This should be a simple task.  I need to use a FC2/3 as a router.  (I have 
> done this in RH7.2 with no problems)  Here is my senerio :
>
> Fedora C3 (soon to be router - I hope)
> External Interface 172.16.176.152 / 20
> Internal Interface 192.168.213.152 / 24
> No GW on internal
> net.ipv4.ip_forward = 1 set in sysctl.conf file (rebooted of-course)
>
> Internal PC
> IP = 192.168.213.253 / 24
> GW = 192.168.213.254
>
> I can ping the 192.168.213.254 and 172.16.176.152 from the internal PC, but 
> not any device in the 172.17.176 network.
>
> This is a full install of FC3.  iptables is default.  I have even disabled 
> iptables to test. Still no luck.........I need a simple solution.  I do not 
> want to disable iptables and install another product.....like firestarter or 
> enable (masquerading) NAT.
>
> There must be a simple solution?
>
> Todd Wohlwend
> Computer Information Systems Instructor
> Southeast Technical Institute
> [e-mail] or [e-mail]

[Bob Chiodini]

On Sat, 2005-03-05 at 20:35 -0800, Justin Zygmont wrote:
> Do you have the external interface set as default gateway device?  You're 
> also going to need NAT if you plan to route through it.
>
> On Sun, 6 Mar 2005, Todd Wohlwend wrote:
> > This should be a simple task.  I need to use a FC2/3 as a router.  (I have 
> > done this in RH7.2 with no problems)  Here is my senerio :
> >
> > Fedora C3 (soon to be router - I hope)
> > External Interface 172.16.176.152 / 20
> > Internal Interface 192.168.213.152 / 24
> > No GW on internal
> > net.ipv4.ip_forward = 1 set in sysctl.conf file (rebooted of-course)
> >
> > Internal PC
> > IP = 192.168.213.253 / 24
> > GW = 192.168.213.254
> >
> > I can ping the 192.168.213.254 and 172.16.176.152 from the internal PC, but 
> > not any device in the 172.17.176 network.
> >
> > This is a full install of FC3.  iptables is default.  I have even disabled 
> > iptables to test. Still no luck.........I need a simple solution.  I do not 
> > want to disable iptables and install another product.....like firestarter or 
> > enable (masquerading) NAT.
> >
> > There must be a simple solution?
> >
> > Todd Wohlwend
> > Computer Information Systems Instructor
> > Southeast Technical Institute
> > [e-mail] or [e-mail]

Todd,

You did not say what routing protocols you intend to use.  Typically the
IP addresses you specified are typically not routable.  They are
designated for private IP spaces.  If computers on your LAN with the
172.16.x.x and the 192.168.x.x addresses need access to the internet you
will need NAT.  Take a look at the iptables rules for masquerading.

If per chance the addresses were examples and you have real addresses
assigned then zebra is the route demon that replaced routed and gated
(IIRC).

Bob...

[Robert L Cochran]

Todd Wohlwend wrote:
> This should be a simple task.  I need to use a FC2/3 as a router.  (I 
> have done this in RH7.2 with no problems)  Here is my senerio :
>
> Fedora C3 (soon to be router - I hope)
> External Interface 172.16.176.152 / 20
> Internal Interface 192.168.213.152 / 24
> No GW on internal
> net.ipv4.ip_forward = 1 set in sysctl.conf file (rebooted of-course)
>
> Internal PC
> IP = 192.168.213.253 / 24
> GW = 192.168.213.254
>
> I can ping the 192.168.213.254 and 172.16.176.152 from the internal 
> PC, but not any device in the 172.17.176 network.
>
> This is a full install of FC3.  iptables is default.  I have even 
> disabled iptables to test. Still no luck.........I need a simple 
> solution.  I do not want to disable iptables and install another 
> product.....like firestarter or enable (masquerading) NAT.
>
> There must be a simple solution?
>
> Todd Wohlwend
> Computer Information Systems Instructor
> Southeast Technical Institute
> [e-mail] or [e-mail]

Read the book "Linux Firewalls" by Robert Ziegler. It is a little 
outdated now, but he publishes scripts in the book which show how to do 
routing. I do simple routing which is similar to yours and use the 
scripts Ziegler provides to make it happen.

The book "Linux Routing" by  Brockmeier et al may also be a little 
outdated but gives the most complete treatment of routing that I've read.

Bob Cochran

[Don Woodward]

On Sat, 2005-03-05 at 22:43, Todd Wohlwend wrote:
> This should be a simple task.  I need to use a FC2/3 as a router.  (I have 
> done this in RH7.2 with no problems)  Here is my senerio :
>
> Fedora C3 (soon to be router - I hope)
> External Interface 172.16.176.152 / 20
> Internal Interface 192.168.213.152 / 24
> No GW on internal
> net.ipv4.ip_forward = 1 set in sysctl.conf file (rebooted of-course)
>
> Internal PC
> IP = 192.168.213.253 / 24
> GW = 192.168.213.254
>
> I can ping the 192.168.213.254 and 172.16.176.152 from the internal PC, but 
> not any device in the 172.17.176 network.

Why is your Internal PC's default gateway not set to 192.168.213.152?

Do the devices on the 172.16.176.x network have a default router which
knows how to get to the 192.168.213.x network?

Don Woodward