From: Gary Duncanson (gary.duncanson@googlemail.com)
Date: Tue Jul 03 2007 - 06:56:29 ART
It won't. You might be confusing subnet information contained in routing
updates and IP header info.
The netmask helps define the range of IP addresses assigned by your ISP for
dynamic NAT. The hosts internally that match on the ip nat inside source
list ACL will use the ip addresses defined in the ip nat pool command for
translation.
Do show ip nat statistics to see the start and end IP address of your NAT
pool in the output.
----- Original Message -----
From: <paul.cocker@bt.com>
To: <dotcomvijay@gmail.com>; <ccielab@groupstudy.com>
Sent: Tuesday, July 03, 2007 10:27 AM
Subject: RE: ip nat pool command
> Hi Vivjay,
>
> Thanks for you response.
>
> I thought there was no field in the IP header for subnet mask, so I'm a
> little confused how it would enter the ISP with a particular subnet
> mask?
>
> Regards,
> Paul
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Vijay babu
> Sent: 03 July 2007 09:51
> To: ccielab@groupstudy.com
> Subject: Re: ip nat pool command
>
> My understanding is...
>
> When the nat pool is defined with
> Ip nat pool XYW 1.1.1.1 1.1.1.50 netmask 255.255.255.0
>
> The nated packet leaving your network is give an ip 1.1.1.1 with a
> subnet
> mask
> of 255.255.255.0. This also means the ISP has provided you a 1.1.1.0
> (entire
> class c)subnet
> for your Internet access.
>
> If nat pool is defined with
> Ip nat pool XYW 1.1.1.1 1.1.1.50 netmask 255.255.255.128
>
> The nated packet is give an ip 1.1.1.1 with network mask 255.255.255.128
> This means your ISP has given you 1.1.1.1 till 1.1.1.126 range of
> ip address for your use.
>
> Cheers
>
> Vijay
>
>
>
>
> On 7/3/07, paul.cocker@bt.com <paul.cocker@bt.com> wrote:
>>
>> Hi All,
>>
>> I'm a little confused what exactly the netmask command does
>>
>> Ip nat pool XYW 1.1.1.1 1.1.1.50 netmask 255.255.255.0
>>
>> How does that differ from
>>
>> Ip nat pool XYW 1.1.1.1 1.1.1.50 netmask 255.255.255.128 ?
>>
>> What's the purpose of it?
>>
>> Regards,
>> Paul
>>
>>
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