IPv4 Routing | 259
14
IPv4 Routing
The Dell Force10 operating software (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
• Directed Broadcast
• Resolution of Host Names
• Addess Resolution Protocol (ARP)
• Internet Control Message Protocol (ICMP)
• UDP Helper
Table 14-1 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, you can configure one network with different masks. Supernetting,
which increases the number of subnets, is also supported. Subnetting occurs when a mask is added to the
IP address to separate the network and host portions of the IP address.
At its most basic level, an IP address is 32-bits composed of network and host portions and represented in
dotted decimal format. For example, 10.214.87.131 is represented as:
00001010110101100101011110000011
For more information about IP addressing, refer to RFC 791, Internet Protocol.
Table 14-1. IP Defaults
IP Feature Default
DNS Disabled
Directed Broadcast Disabled
Proxy ARP Enabled
ICMP Unreachable Disabled
ICMP Redirect Disabled
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