Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

HELP: How do i pass through public IP's from dialer interface to physical interface without NAT?

 

 

Hello,

 

I'm having alot of trouble trying to do something reasonably straight forward, or so i thought.  I have been given a /29 ip block by my ISP, im using a Cisco 2811 router with an ADSL HWIC.  If i set the dialer interface to "ip address negotiated" it works fine, but i want to put that ip block directly on the inside interface so i don't have to use NAT overload or static 121 NAT.

 

I have tried putting my block of IPs on Gi0/1 and removing "ip address negotiated" from the dialer interface and replacing it with "ip unnumbered GI0/1" thinking it would force the dialer interface to take the ip from the GI0/1 instead.  However i just cant get out to the internet when i do this.

 

Am i missing any commands or am i doing it wrong?  I have googled this o nthe web but can't seem to find the answer which is odd, everybody uses NAT instead.

 

Passing through a public block from an ISP to a physical interface shouldn't be too difficult surely?

 

 

Can anyone crack this for me?

 

 

Many thanks!

 

Matthew

 

Just as an extra note i found this article which is similar to what i want to do but uses a vlan interface (because its a 887 and has switchports for access)

http://forums.thinkbroadband.com/fibre/4133359-cisco-887va.html

 

 

2 REPLIES
New Member

Ok i have cracked it, i had a

Ok i have cracked it, i had a typo in the IP address on the physical interface, this now works as intended, it appears i have answered by own question.....

 

 

Cheers anyway.

 

Matt

New Member

Hi Matt,Could you post a

Hi Matt,

Could you post a config of yours.

I am trying to do a similar thing. I've got a block of /29 addresses, and would like to use 1 Public IP for the router and 1 Public IP for the firewall which is behind the router.

Did you have to Bridge the Dialer interface with FA? 

How did you end up solving this mystery?

I also do want to avoid 121 NATing.

Thanks!

Dawid

153
Views
0
Helpful
2
Replies
CreatePlease login to create content