Pls explain the sense of source and destination SVI ACL

Hi I have a home network up and well running that uses a Cisco 1801.

I'm just trying to increase my understanding of some is the config and I'm confused by ACL on an interface VLAN.

OK so I "be the router" and imagine packets flowing to me and me

I have two VLAN configured

VLAN 10 - 10.10.10.0 / 25

VLAN 20 - 10.10.10.128/27

So, for example, one of my Virtual Machines has the address of 10.10.10.6 and is on VLAN 10.

Another is the 10.10.10.134 address and VLAN 20.

I want to allow 10.10.10.6 Access 10.10.10.134, but keep the other VLAN 10 access devices.

So I create an ACL and apply it to interface Vlan 20 entrants.

The configuration below works as you want, but I don't understand why.

If packet filtering is for the incoming direction of the interface, then my logic would state that the source address of the packet filter would be 10.10.10.6, not 10.10.10.134.

Can someone help me understand. Thank you.

interface Vlan20

ip access-group ACL-INBOUND in

ip access-list extended ACL-INBOUND

permit ip host 10.10.10.134 host 10.10.10.6 log-input

That is to say, a vlan SVI is no different from a physical interface with respect to an acl.

to apply an acl entering traffic control devices SVI in this vlan

apply an acl Outbound IVR auxdispositifs controls traffic to that vlan

I want to allow 10.10.10.6 Access 10.10.10.134, but keep the other VLAN 10 access devices.

access-list 101 permit ip host 10.10.10.6 10.10.10.134

access-list 101 deny ip 10.10.10.0 0.0.0.127 host 10.10.10.134

access list 101 ip allow a whole

int vlan 10

IP access-group 101 in

the acl above allows 10.10.10.6 to talk to 10.10.10.134 but blocks all other 10.10.10.x/25 customers to talk to 10.10.10.134. Then, it allows customers to 10.10.10.x/25 to talk to everything else. Note You can not only "permit ip any any" at the end, but you will want to probably other lines permit while I have included a general all allow.

I hope you see it's the same concept applies an acl to a physical interface in terms of incoming and outgoing traffic. Whence came the confusion was probably that you have applied the acl to vlan 20 then he effectively blocked the return circulation and not the original packet from to vlan 10.

It is usually best to filter packets to their source.

Jon

Tags: Cisco Network

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