Administrator Guide

24
IPv4 Routing
The Dell Networking OS supports various IP addressing features.
This chapter describes the basics of domain name service (DNS), address resolution protocol (ARP), and routing principles and their
implementation in the Dell Networking operating system (OS).
IP Feature Default
DNS Disabled
Directed Broadcast Disabled
Proxy ARP Enabled
ICMP Unreachable Disabled
ICMP Redirect Disabled
IP Addresses
The Dell Networking OS supports IP version 4, as described in RFC 791. It also supports classful routing and variable length subnet
masks (VLSM).
With VLSM, you can congure one network with dierent masks. Supernetting, which increases the number of subnets, is also
supported. To subnet, you add a mask 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, 00001010110101100101011110000011 is represented as 10.214.87.131.
For more information about IP addressing, refer to RFC 791, Internet Protocol.
Implementation Information
In the Dell Networking OS, you can congure any IP address as a static route except IP addresses already assigned to interfaces.
NOTE: The Dell Networking OS versions 7.7.1.0 and later support 31-bit subnet masks (/31, or 255.255.255.254) as
dened by RFC 3021. This feature allows you to save two more IP addresses on point-to-point links than 30-bit masks.
The system supports RFC 3021 with ARP.
Conguration Tasks for IP Addresses
The following describes the tasks associated with IP address conguration.
Conguration tasks for IP addresses includes:
• Assigning IP Addresses to an Interface (mandatory)
• Conguring Static Routes (optional)
• Congure Static Routes for the Management Interface (optional)
For a complete listing of all commands related to IP addressing, refer to the Dell Networking OS Command Line Interface Reference
Guide.
380
IPv4 Routing