Service Manual

IPv4 Routing

The Dell Networking Operating System (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 OS.

IP Feature Default

DNS Disabled

Directed Broadcast Disabled

Proxy ARP Enabled

ICMP Unreachable Disabled

ICMP Redirect Disabled

IP Addresses

Dell Networking OS supports IP version 4, as described in RFC 791. Dell Networking OS 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 Dell Networking OS, you can congure any IP address as a static route except IP addresses already assigned to interfaces.

NOTE: Dell Networking OS supports 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. Dell Networking OS supports RFC

3021 with ARP.

NOTE: Even though Dell Networking OS listens to all ports, you can only use the ports starting from 35001 for IPv4

trac. Ports starting from 0 to 35000 are reserved for internal use and you cannot use them for IPv4 trac.

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)

336

IPv4 Routing