nat bypass

nat bypass

[ratheesh k]

Hi,

  A -------> R ------->S

I have a linux machine A is connected to Linux machine R . Machine R
is having two network interfaces and acting as a router .
It has a dhcp server running  . It will assign ip in 192.168.1.0/24
subnet to all machine connected on lan side ( A is connected also in
lan side ) . Wan side of R is connected to HTTP server S . There is
also a DHCP server running on S to assign ip in 10.232.18.0/24 subnet
.  Is there any way , in which NAT should be bypassed to get ip from
DHCP server running  on S . My question is : How can A will get  an ip
from 10.232.18.0/24 pool ip .?
ebtables is an option ? How can we make it ?
Is there any other optimal way ?


Thanks,
Ratheesh

Re: nat bypass

[Simon Horman]

On Mon, Jun 28, 2010 at 03:43:46PM +0530, ratheesh k wrote:
> Hi,
> 
>   A -------> R ------->S
> 
> I have a linux machine A is connected to Linux machine R . Machine R
> is having two network interfaces and acting as a router .
> It has a dhcp server running  . It will assign ip in 192.168.1.0/24
> subnet to all machine connected on lan side ( A is connected also in
> lan side ) . Wan side of R is connected to HTTP server S . There is
> also a DHCP server running on S to assign ip in 10.232.18.0/24 subnet
> .  Is there any way , in which NAT should be bypassed to get ip from
> DHCP server running  on S . My question is : How can A will get  an ip
> from 10.232.18.0/24 pool ip .?
> ebtables is an option ? How can we make it ?
> Is there any other optimal way ?

Let me try and understand this.

R is routing between 192.168.1.0/24 and 10.232.18.0/24.
As A is on the 192.168.1.0/24 side of R.
But to give A an 10.232.18.0/24 address (dynamically)?

Why?

Re: nat bypass

[ratheesh k]

> Let me try and understand this.
>
> R is routing between 192.168.1.0/24 and 10.232.18.0/24.
> As A is on the 192.168.1.0/24 side of R.
> But to give A an 10.232.18.0/24 address (dynamically)?
>
> Why?
>

For some clients , R should act as a mere bridge , Not a router .


On Wed, Jun 30, 2010 at 8:07 AM, Simon Horman <horms@verge.net.au> wrote:
> On Mon, Jun 28, 2010 at 03:43:46PM +0530, ratheesh k wrote:
>> Hi,
>>
>>   A -------> R ------->S
>>
>> I have a linux machine A is connected to Linux machine R . Machine R
>> is having two network interfaces and acting as a router .
>> It has a dhcp server running  . It will assign ip in 192.168.1.0/24
>> subnet to all machine connected on lan side ( A is connected also in
>> lan side ) . Wan side of R is connected to HTTP server S . There is
>> also a DHCP server running on S to assign ip in 10.232.18.0/24 subnet
>> .  Is there any way , in which NAT should be bypassed to get ip from
>> DHCP server running  on S . My question is : How can A will get  an ip
>> from 10.232.18.0/24 pool ip .?
>> ebtables is an option ? How can we make it ?
>> Is there any other optimal way ?
>
> Let me try and understand this.
>
> R is routing between 192.168.1.0/24 and 10.232.18.0/24.
> As A is on the 192.168.1.0/24 side of R.
> But to give A an 10.232.18.0/24 address (dynamically)?
>
> Why?
>
>

Re: nat bypass

[Stephen Clark]

On 06/30/2010 05:24 AM, ratheesh k wrote:
>> Let me try and understand this.
>>
>> R is routing between 192.168.1.0/24 and 10.232.18.0/24.
>> As A is on the 192.168.1.0/24 side of R.
>> But to give A an 10.232.18.0/24 address (dynamically)?
>>
>> Why?
>>
>
> For some clients , R should act as a mere bridge , Not a router .
>
>
> On Wed, Jun 30, 2010 at 8:07 AM, Simon Horman<horms@verge.net.au>  wrote:
>> On Mon, Jun 28, 2010 at 03:43:46PM +0530, ratheesh k wrote:
>>> Hi,
>>>
>>>    A ------->  R ------->S
>>>
>>> I have a linux machine A is connected to Linux machine R . Machine R
>>> is having two network interfaces and acting as a router .
>>> It has a dhcp server running  . It will assign ip in 192.168.1.0/24
>>> subnet to all machine connected on lan side ( A is connected also in
>>> lan side ) . Wan side of R is connected to HTTP server S . There is
>>> also a DHCP server running on S to assign ip in 10.232.18.0/24 subnet
>>> .  Is there any way , in which NAT should be bypassed to get ip from
>>> DHCP server running  on S . My question is : How can A will get  an ip
>>> from 10.232.18.0/24 pool ip .?
>>> ebtables is an option ? How can we make it ?
>>> Is there any other optimal way ?
>>
>> Let me try and understand this.
>>
>> R is routing between 192.168.1.0/24 and 10.232.18.0/24.
>> As A is on the 192.168.1.0/24 side of R.
>> But to give A an 10.232.18.0/24 address (dynamically)?
>>
>> Why?
>>
>>
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Will dhcprelay work for you?

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