Configuration manual

IPv4 Addressing | 479

IPv4 Addressing

IPv4 Addressing is supported on platforms c e s

IPv4 addressing is supported on the E-Series ExaScale platform with FTOS 8.1.1.0 and later.

FTOS supports various IP addressing features. This chapter explains the basics of Domain Name Service

(DNS), Address Resolution Protocol (ARP), and routing principles and their implementation in FTOS.

• IP Addresses on page 479

• Directed Broadcast on page 484

• Resolution of Host Names on page 484

• ARP on page 487

• ICMP on page 491

• UDP Helper on page 492

Table 22-1 lists the defaults for the IP addressing features described in this chapter.

IP Addresses

FTOS supports IP version 4, as described in RFC 791. It also supports classful routing and Variable Length

Subnet Masks (VLSM). With VLSM one network can be can configured with different masks.

Supernetting, which increases the number of subnets, is also supported. Subnetting is when a mask is

added to the IP address to separate the network and host portions of the IP address.

Table 22-1. IP Defaults

IP Feature Default

DNS Disabled

Directed Broadcast Disabled

Proxy ARP Enabled

ICMP Unreachable Disabled

ICMP Redirect Disabled