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New Member

IP won't get assigned to an interface by isp dhcp

Hello everyone; I've been using this setting for clients in small offices and what not,  and since all they wanted was to give another nutch of security to their network, we've been intalling cisco routers 2600 series still outhere for their internet connections and we had no issues what so ever, not until we run into cable isp provider, and their dhcp wont be able to assign our interface a dynamic IP, this is the setting aplied to the router interface;

interface fastethernet0/0

ip address dhcp

ip nat outside

no ip redirects

no ip unreachables

no ip proxy-arp

any ideas of why it wont be seen or assigned an ip by their dhcp, I talked to their isp and they assigned a static ip (private one) and we still have the same issue, if i connect a pix 506e interface with the ip add dhcp assigned  to it gets a dynamic ip right away...

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

IP won't get assigned to an interface by isp dhcp

Update IOS to begin with. Then, there maybe special settings needed if ISP is using a DHCP relay.

8 REPLIES
Hall of Fame Super Gold

IP won't get assigned to an interface by isp dhcp

Update IOS to begin with. Then, there maybe special settings needed if ISP is using a DHCP relay.

New Member

Re: IP won't get assigned to an interface by isp dhcp

thanks for your answear, and sorry too be away and not able to get back to you guys... i'll try to upgrade the ios, and as far as sub-interfaces... it seems that I have no command for the dot1q on this ios ver (12.2(8)T10... any help will be great if you may know what ver could I upgrade to be able to get assigned a dynamic ip and sub-interfacing working for this application.

Hall of Fame Super Gold

Re: IP won't get assigned to an interface by isp dhcp

Write back once you have updated IOS to latest.

New Member

Re: IP won't get assigned to an interface by isp dhcp

that did the trick.. new IOS and now an ip gets assigned dynamically

New Member

IP won't get assigned to an interface by isp dhcp

Hi,

Try to create a sub-interface on the WAN link with dot1q vlan set to 1. This should help.

Regards,

Pawan Sharma

http://www.ebrahma.com

Hall of Fame Super Gold

Re: IP won't get assigned to an interface by isp dhcp

pawan sharma wrote:

Hi,

Try to create a sub-interface on the WAN link with dot1q vlan set to 1. This should help.


Likely will not.

New Member

Re: IP won't get assigned to an interface by isp dhcp

:-)

New Member

Re: IP won't get assigned to an interface by isp dhcp

after a while the IOS got up-graded on the router and the ip add dhcp works fiena as well as encapsulation to the sub-interfaces thanks to all

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