05-26-2020 12:05 PM
Hi,
I am building a small LAN that makes use of several different VLANs (2, 10, 20 & 30) along with interVLAN trunking via a Layer 3 Switch.
I am trying to stop devices in VLAN 10, 20 and 30 from communicating with each other, but allowing for devices in VLAN 2 access to each VLAN.
Would using an access list to block the IP addresses in the subnets be the best way to ensure the VLANs cannot communicate? Is there any better way I could have achieved the same result?
The following config I have applied to the Layer 3 switch
ip access-list extended VLAN30
permit ip 10.5.3.0 0.0.0.15 any
deny ip 10.5.3.16 0.0.0.15 any
deny ip 10.5.3.64 0.0.0.63 any
int vlan30
ip access-group VLAN30 out
ip access-list extended VLAN20
permit ip 10.5.3.0 0.0.0.15 any
deny ip 10.5.3.32 0.0.0.15 any
deny ip 10.5.3.64 0.0.0.63 any
int vlan20
ip access-group VLAN20 out
ip access-list extended VLAN10
permit ip 10.5.3.0 0.0.0.15 any
deny ip 10.5.3.16 0.0.0.15 any
deny ip 10.5.3.32 0.0.0.15 any
int vlan10
ip access-group VLAN10 out
I have attached a network diagram to help visualize my network
Any help is much appreciated
05-26-2020 12:18 PM
05-26-2020 02:01 PM - edited 05-26-2020 02:03 PM
Hello
@RhysDmll6778 wrote:
I am trying to stop devices in VLAN 10, 20 and 30 from communicating with each other, but allowing for devices in VLAN 2 access to each VLAN.
ip access-list extended vlan10_novl20-30
deny ip 10.5.3.16 0.0.0.15 any
deny ip 10.5.3.32 0.0.0.15 any
permit ip any any
int vlan 10
ip access-group vlan10_novl20-30 out
ip access-list extended vlan20_novlan10-30
deny ip 10.5.3.64 0.0.0.15 any
deny ip 10.5.3.32 0.0.0.15 any
permit ip any any
int vlan 20
ip access-group vlan20_novlan10-30 out
ip access-list extended vlan30_novlan20-30
deny ip 10.5.3.64 0.0.0.15 any
deny ip 10.5.3.16 0.0.0.15 any
permit ip any any
int vlan 30
ip access-group vlan30_novlan20-30 out
05-26-2020 02:48 PM
Hello,
is this actually a Packet Tracer project, or a real multilayer switch ? If it is a real switch, you could also consider VACLs...
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide