[Scottish] ADSL router with no-nat configuration

Tam McLaughlin scottish at mailman.lug.org.uk
Fri Mar 21 15:04:01 2003

I called the suppliers/manufacturers of the router who told me that
I need 3 useable IP addresses for this particular router to work in a no-nat 
configuration. So looks like I would never have got it working with the info 
the ISP gave me. Hopefully they will increate my address range.

On Friday 21 Mar 2003 10:10 am, Tam McLaughlin wrote:
> Hi,
> I am having problems setting up a solwise SAR110 adsl router with a no-nat
> configuration and wonder if anyone here has set up an adsl router with a
> similar config. I simply want to connect the router to our smoothwall and
> have been allocated an address range of 4 ip addresses. The problem seems
> to be with the default route not going through the ppp interface.
> Our ISP said they cannot help, despite having tutorials for no-nat setups
> for two other types of modems but not this supplied one.
> I was able to set up the router with the standard nat option ok, but
> according to the ISP, to set it up as no-nat, all I need to do is configure
>  eth-0 with appropriate ip address/mask from range supplied.
> To test this, I have set up a laptop with the other useable ip address/mask
> and the laptop and router can talk to one another.
> The router gets authenticated and connected to the ISP network (As
> confirmed by support) and sets up some dynamic routes.
> I have tried configuring the router by leaving the ip address of the ppp
> interface blank, which automatically gets allocated the correct ip address
> on connection and also set the ip address manually on the ppp interface.
> This is the routing table with a no-nat config where:
> address range:
> dns:,
> ---------------------------------------------------------------------------
> Destination           netmask           next hop            ifname  type
>             eth-0  
> indirect               lo-0
>    direct      eth-0  
> indirect  eth-0   indirect
>  eth-0   indirect
>      eth-0  direct
>           lo-o   direct
> the routing table with the nat config is similar but the default route is
> via ppp-0
>             ppp-0  
> indirect      ppp-0   direct
> The configuration (web and CLI) does not allow me to specify the interface
> when adding or modifying routes.
> Support also gave me instructions on adding a BIMAP nat rule which does not
> work either.
> Any help would be appreciated.
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