Macff Arp Proxy Screen - ZyXEL Communications MSC1000G User Manual

An IP address with host IDs of all zeros is the IP address of the network (192.168.1.0 with a 24-bit
subnet mask, for example). An IP address with host IDs of all ones is the broadcast address for that
network (192.168.1.255 with a 24-bit subnet mask, for example).
As these two IP addresses cannot be used for individual hosts, calculate the maximum number of
possible hosts in a network as follows:
Table 52 Maximum Host Numbers
SUBNET MASK
8 bits 255.0.0.0
16 bits 255.255.0.0
24 bits 255.255.255.0
29 bits 255.255.255.248
Notation
Since the mask is always a continuous number of ones beginning from the left, followed by a
continuous number of zeros for the remainder of the 32 bit mask, you can simply specify the
number of ones instead of writing the value of each octet. This is usually specified by writing a "/"
followed by the number of bits in the mask after the address.
For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with subnet mask 255.255.255.128.
The following table shows some possible subnet masks using both notations.
Table 53 Alternative Subnet Mask Notation
SUBNET MASK
255.255.255.0
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
255.255.255.252

4.31 MACFF ARP Proxy Screen

Click ACL > MACFF ARP Proxy to open the screen. Use this screen to view Address Resolution
Protocol (ARP) entries of Access Routers (ARs) and Application Servers (ASes) for which the MSC
acts as a proxy to respond to ARP queries from subscribers.
Management Switch Card User's Guide
HOST ID SIZE
24 bits
16 bits
8 bits
3 bits
ALTERNATIVE LAST OCTET
NOTATION (BINARY)
/24 0000 0000
/25 1000 0000
/26 1100 0000
/27 1110 0000
/28 1111 0000
/29 1111 1000
/30 1111 1100
Chapter 4 Access Control List Screens
MAXIMUM NUMBER OF HOSTS
24
2 – 2 16777214
16
2 – 2 65534
8
2 – 2 254
3
2 – 2 6
LAST OCTET
(DECIMAL)
0
128
192
224
240
248
252
145