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FTOS Configuration Guide for the C-Series - Force10 Networks

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Chapter 16 IP Addressing<br />

IP Addressing is supported on plat<strong>for</strong>ms c e s<br />

<strong>FTOS</strong> supports various IP addressing features. This chapter explains <strong>the</strong> basics of Domain Name Service<br />

(DNS), Address Resolution Protocol (ARP), and routing principles and <strong>the</strong>ir implementation in <strong>FTOS</strong>.<br />

• IP Addresses on page 313<br />

• Directed Broadcast on page 318<br />

• DHCP on page 318<br />

• Resolution of Host Names on page 319<br />

• ARP on page 322<br />

• ICMP on page 324<br />

• UDP Helper on page 325<br />

Table 32 lists <strong>the</strong> defaults <strong>for</strong> <strong>the</strong> IP addressing features described in this chapter.<br />

Table 32 IP Defaults<br />

IP Feature Default<br />

DNS Disabled<br />

Directed Broadcast Disabled<br />

Proxy ARP Enabled<br />

ICMP Unreachable Disabled<br />

ICMP Redirect Disabled<br />

IP Addresses<br />

<strong>FTOS</strong> supports IP version 4, as described in RFC 791. It also supports classful routing and Variable Length<br />

Subnet Masks (VLSM). With VLSM one network can be can configured with different masks.<br />

Supernetting, which increases <strong>the</strong> number of subnets, is also supported. Subnetting is when a mask is<br />

added to <strong>the</strong> IP address to separate <strong>the</strong> network and host portions of <strong>the</strong> IP address.<br />

At its most basic level, an IP address is 32-bits composed of network and host portions and represented in<br />

dotted decimal <strong>for</strong>mat. For example,<br />

00001010110101100101011110000011<br />

is represented as 10.214.87.131<br />

For more in<strong>for</strong>mation on IP addressing, refer to RFC 791, Internet Protocol.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 313

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