Enable the VLAN on sub interface internet access but block traffic to VLAN native

I have a 2821 router w / MLS 2024 switches.  Native VLAN(default vlan) is my private network and VLAN 100 is my comments system.  Below is my interface config...

interface GigabitEthernet0/1

Description ES_LAN, ETH - LAN$ $$

IP 10.1.0.2 255.255.0.0

penetration of the IP stream

IP nat inside

IP virtual-reassembly

automatic duplex

automatic speed

!

!

interface GigabitEthernet0/1.1

encapsulation dot1Q 100

IP 10.3.1.254 255.255.255.0

penetration of the IP stream

IP nat inside

IP virtual-reassembly

!

IP default-gateway xx.xxx.xxx.xxx

IP forward-Protocol ND

IP http server

23 class IP http access

local IP http authentication

IP http secure server

IP http timeout policy slowed down 60 life 86400 request 10000

Default route is defined...

IP route 0.0.0.0 0.0.0.0 xx.xxx.xxx.xxx

Access list are...

access-list 175 deny ip 10.1.0.0 0.0.255.255 10.2.0.0 0.0.255.255

access-list 175 allow ip 10.1.0.0 0.0.255.255 everything

access-list 175 deny ip 10.3.1.0 0.0.0.255 10.1.0.0 0.0.255.255

access-list 175 allow ip 10.3.1.0 0.0.0.255 any

I want to continue to have access to the guest VLAN in VLAN private to allow the management of points of access etc.

I want to allow internet access as guest newtork but block it to access my private network.

Don't know how to do in this regard.  I tried to change the ACLs (remove the 10.3.1.0 entries) and creating an another acl for the Scriptures and applying that VLAN 100 sub interface... so far without success.

Thanks in advance for the help!

Hello Chris,

> From this point of view should I leave the above lines and create another list acl for the 10.3.1.0 of the network and apply entering gig0/1.1?

I would go this way, as in a simple ACL, you can't express your needs. The ACL to apply on gi0/1.1 will probably need further instructions then the ones I suggested, but divide the problem into smaller manageable pieces is a good strategy.

> Also with this config would be NAT be performed on each network by making this change?

Until the internal network and network of comments are on the same side (ip nat inside) there is no NAT triggered in communication between them so that you should not influence the NAT configuration with this change.

Hope to help

Giuseppe

Tags: Cisco Network

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