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How do i config using the ios,a cisco router NAT when my isp uses dhcp.?

i dont have a static ip but instead my isp uses dhcp. so how do i configure nat on cisco routers using the ios cli.

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This entry was posted on Friday, June 19th, 2009 at 6:44 pm and is filed under Cisco Router. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

One Response to “How do i config using the ios,a cisco router NAT when my isp uses dhcp.?”

  1. Lanwanprofessional.com on June 19th, 2009 at 6:44 pm

    Hello,

    This is no problem at all for cisco. You can instead of specifiyng IP, specify the interface name (or subinterface).

    We have recently posted about it. Please check this post:
    http://cs-ms.blogspot.com/2009/06/configuring-nat-dynamic-translation.html

    The only thing you need to change is this line:

    GatewayRouter(config)#ip nat inside source list 1 pool OUTSIDE

    to

    GatewayRouter(config)#ip nat inside source list 1 interface fastEthernet 0/0

    This is assuming that your public IP is assigned to F0/0 (via DHCP).

    In the furute you may find usefull also services like no-ip.com, dyndns.com, dnsalias.net in order to have dns hostname assigned. So you will have a chance to connect for example from work/school to your router using for example: youhome.dyndns.com

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