IP ACL OperationWildcard Masks in A

IP ACL Operation
Wildcard Masks in ACLs

Wildcard Masks to Match IPv4 Subnets

Calculating the wildcard mask can take some practice. Figure 1 provides three examples of wildcard masks.

In the first example the wildcard mask stipulates that every bit in the IPv4 192.168.1.1 must match exactly.

In the second example, the wildcard mask stipulates that anything will match.

In the third example, the wildcard mask stipulates that any host within the 192.168.1.0/24 network will match.

These examples were fairly simple and straightforward. However, the calculation of wildcard masks can be more complex.

Wildcard Masks to Match Ranges

The two examples in Figure 2 are more complex. In example 1, the first two octets and first four bits of the third octet must match exactly. The last four bits in the third octet and the last octet can be any valid number. This results in a mask that checks for the range of networks 192.168.16.0 to 192.168.31.0.

Example 2 shows a wildcard mask that matches the first two octets, and the least significant bit in the third octet. The last octet and the first seven bits in the third octet can be any valid number. The result is a mask that would permit or deny all hosts from odd subnets from the 192.168.0.0 major network.

Kết quả (Anh) 1:

IP ACL OperationWildcard Masks in ACLsWildcard Masks to Match IPv4 SubnetsCalculating the wildcard mask can take some practice. Figure 1 provides three examples of wildcard masks.In the first example the wildcard mask stipulates that every bit in the IPv4 192.168.1.1 must match exactly.In the second example, the wildcard mask stipulates that anything will match.In the third example, the wildcard mask stipulates that any host within the 192.168.1.0/24 network will match.These examples were fairly simple and straightforward. However, the calculation of wildcard masks can be more complex.Wildcard Masks to Match RangesThe two examples in Figure 2 are more complex. In example 1, the first two octets and the first four bits of the third octet must match exactly. The last four bits in the third and the last octet octet can be any valid number. This results in a mask that checks for the range of networks 192.168.16.0 to 192.168.31.0.Example 2 shows a wildcard mask that matches the first two octets, and the least significant bit in the third octet. The last octet and the first seven bits in the third octet can be any valid number. The result is a mask that would permit or deny all hosts from odd subnets from the network 192.168.0.0 major.

Kết quả (Anh) 2:

IP ACL Operation
Wildcard Masks in ACLs Wildcard Masks to Match IPv4 Subnets Calculating the wildcard mask can take some practice. Figure 1 provides three examples of wildcard masks. In the first example the wildcard mask stipulates mà every bit in the IPv4 192.168.1.1 phải Exactly match. In the second example, the wildcard mask stipulates mà anything will match. In the third example, the wildcard mask stipulates có trong any host 192.168.1.0/24 network will match. These fairly simple and straightforward examples là. Tuy nhiên, the calculation of wildcard masks can be more complex. Wildcard Masks to Match Ranges The two examples in Figure 2 are more complex. In example 1, the first two octets and the first four bits of the third octet Exactly phải match. The last four bits in the third octet and the last octet can be any valid number. This results in a mask for the range of checks mà 192.168.16.0 to 192.168.31.0 networks. Example 2 shows a wildcard mask matches the first two octets mà, and the least the significant bits in the third octet. The last octet and the first seven bits in the third octet can be any valid number. The result is a mask would permit or deny mà all hosts from odd subnets from the major network 192.168.0.0.