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7.0

Cisco 2600 Router to NAT

Asked by Gunter17 in Network Routers, Frame Relay, Network Design & Methodology

Tags: Cisco, Router, 2621XM

I have a T1 with Covad, and a Cisco 2600 router. Covad is attached to Serial 0/0 of the router, and I have FE 0/0 going to a Catalyst switch, which my IP Phones, and PIX is plugged into. The PIX is using 74.x.x.2-16 of my IP range, as my router is 74.x.x.1.

My phone network is 10.252.8.0, the router has a secondary IP address of 10.252.8.1, and the switch has an IP address of 10.252.8.2. The switch is running DHCP, and distributing IP addresses to the IP phones. Which is working properly.

The problem is, when I attempt to configure NAT on the Cisco 2600 I get an IP but I cant reach any outside network.

DHCP is distributing the default gateway to the clients as 10.252.8.1

I only want traffic coming from 10.252.8.0 to be natted to the 74.x.x.1 address. The other 74.x.x.x address should continue functioning the way they are now.

Also, when I plug a workstation into the switch I can ping both FE0/0 of the router (10.252.8.1, and 74.x.x.1.)

Relevant configs attached

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             interface FastEthernet0/0
 ip address 10.252.8.1 255.255.255.0 secondary
 ip address 74.x.x.1 255.255.255.192
 ip nat inside
 duplex auto
 speed auto
!
interface Serial0/0
 bandwidth 1500
 no ip address
 encapsulation frame-relay IETF
 no ip mroute-cache
 no fair-queue
 service-module t1 timeslots 1-24
 frame-relay traffic-shaping
 frame-relay lmi-type ansi
!
interface Serial0/0.16 point-to-point
 ip nat outside
 frame-relay interface-dlci 16 ppp Virtual-Template1
  class AutoQoS-VoIP-FR-Serial0/0-16
  auto qos voip
!
interface Virtual-Template1
 ip address negotiated
 ppp chap hostname xxx
 ppp chap password 0 xxx
 ppp ipcp dns request
!
ip nat inside source list 101 interface Serial0/0.16 overload
!
ip route 0.0.0.0 0.0.0.0 172.22.0.1
ip route 0.0.0.0 0.0.0.0 172.17.0.1
!
access-list 101 permit ip any any
access-list 101 permit ip 10.252.8.0 0.0.0.255 any

           
         

	Title
1	Configuring a Cisco 2651 to use WI…
2	3650 switch on Fiber backbone fro…
3	isolated vlan

Cisco 2600 Router to NAT

Asked by Gunter17 in Network Routers, Frame Relay, Network Design & Methodology

Tags: Cisco, Router, 2621XM

About this solution