cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
930
Views
0
Helpful
4
Replies

Configuring Catalyst 4503 Port as Internet Gateway

arun
Level 1
Level 1

I have 4503 switch with Gig1/12 operating in L3 mode ( no switchport ) and has been assigned IP 115.115.115.66/255.255.255.224 as internet real IP.

Vlan 1 is 192.168.0.1 with member ports Gig1/1 to Gig1/11

I am able to ping hosts on the Vlan1 from inside the switch, internet gateway 115.115.5.65 also.

ip routing is enabled,

ip route 0.0.0.0 0.0.0.0 gig1/12 

The hosts from Vlan1 are not able to access the internet. Can you suggest the right configuration ?

4 Replies 4

paila.srinivas
Level 1
Level 1

Can you please attach you existing Topology and configurations of the switch -  also confirm if you have any nat configured on the internet router /FW

chris.rae07
Level 1
Level 1

Hi Arun,

Have you got an SVI (VLAN Interface) configured for VLAN 1 with the gateway configured? ie. 192.168.0.254/24

Can you paste in -:      sh ip route

                                   sh run

Thanks

Chris

Ganesh Hariharan
VIP Alumni
VIP Alumni

I have 4503 switch with Gig1/12 operating in L3 mode ( no switchport ) and has been assigned IP 115.115.115.66/255.255.255.224 as internet real IP.

Vlan 1 is 192.168.0.1 with member ports Gig1/1 to Gig1/11

I am able to ping hosts on the Vlan1 from inside the switch, internet gateway 115.115.5.65 also.

ip routing is enabled,

ip route 0.0.0.0 0.0.0.0 gig1/12 

The hosts from Vlan1 are not able to access the internet. Can you suggest the right configuration

For access internet you need to configure NAT on 4500 series switches but unfortunetly 4500 series switches does not support NAT featue either you need to have 6500 series or router.

Check out the below with switches which support NAT feature

http://www.cisco.or.at/en/US/tech/tk648/tk361/technologies_tech_note09186a008011c629.shtml

Hope to Help !!

Ganesh.H

Remember to rate the helpful post

Hi Arun,

For the internet to work in you lan you may have to introduce a Router after you 45XX switch where all the traffice to be pointed to router and you need to do NAT to, translate the inside  priviteip adress to outside pubic ip.

Regards

Srinivas

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: