24
IPv4 Routing
IPv4 routing and various IP addressing features are supported. This chapter describes the basics of
domain name service (DNS), address resolution protocol (ARP), and routing principles and their
implementation in the Dell Networking 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), 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. 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
You can configure any IP address as a static route except IP addresses already assigned to interfaces.
NOTE: 31-bit subnet masks (/31, or 255.255.255.254), as defined by RFC 3021, are supported. This
feature allows you to save two more IP addresses on point-to-point links than 30-bit masks. The
system also supports RFC 3021 with ARP.

Configuration Tasks for IP Addresses

The following describes the tasks associated with IP address configuration.
Configuration tasks for IP addresses includes:
•Assigning IP Addresses to an Interface (mandatory)
IPv4 Routing 443