Connectivity Guide

Table Of Contents
Configuring DNS with Traceroute
To configure your switch to perform DNS with traceroute, use the following commands.
Enable dynamic resolution of host names.
CONFIGURATION mode
ip domain-lookup
Specify up to six name servers.
CONFIGURATION mode
ip name-server ip-address [ip-address2 ... ip-address6]
The order you entered the servers determines the order of their use.
When you enter the traceroute command without specifying an IP address (Extended Traceroute), you are
prompted for a target and source IP address, timeout in seconds (default is 5), a probe count (default is 3), minimum
TTL (default is 1), maximum TTL (default is 30), and port number (default is 33434).
CONFIGURATION mode
traceroute [host | ip-address]
To keep the default setting for these parameters, press the ENTER key.
The following text is example output of DNS using the traceroute command.
DellEMC#traceroute www.force10networks.com
Translating "www.force10networks.com"...domain server (10.11.0.1) [OK]
Type Ctrl-C to abort.
----------------------------------------------------------------------
Tracing the route to www.force10networks.com (10.11.84.18), 30 hops max, 40 byte packets
----------------------------------------------------------------------
TTL Hostname Probe1 Probe2 Probe3
1 10.11.199.190 001.000 ms 001.000 ms 002.000 ms
2 gwegress-sjc-02.force10networks.com (10.11.30.126) 005.000 ms 001.000 ms 001.000 ms
3 fw-sjc-01.force10networks.com (10.11.127.254) 000.000 ms 000.000 ms 000.000 ms
4 www.dell.com (10.11.84.18) 000.000 ms 000.000 ms 000.000 ms
DellEMC#
ARP
Dell EMC Networking OS uses two forms of address resolution: address resolution protocol (ARP) and Proxy ARP.
ARP runs over Ethernet and enables endstations to learn the MAC addresses of neighbors on an IP network. Over time, Dell
EMC Networking OS creates a forwarding table mapping the MAC addresses to their corresponding IP address. This table is
called the ARP Cache and dynamically learned addresses are removed after a defined period of time.
For more information about ARP, refer to RFC 826, An Ethernet Address Resolution Protocol.
In Dell EMC Networking OS, Proxy ARP enables hosts with knowledge of the network to accept and forward packets from
hosts that contain no knowledge of the network. Proxy ARP makes it possible for hosts to be ignorant of the network, including
subnetting.
For more information about Proxy ARP, refer to RFC 925, Multi-LAN Address Resolution, and RFC 1027, Using ARP to
Implement Transparent Subnet Gateways.
Configuration Tasks for ARP
For a complete listing of all ARP-related commands, refer to the Dell EMC Networking OS Command Line Reference Guide.
Configuration tasks for ARP include:
Configuring Static ARP Entries (optional)
Enabling Proxy ARP (optional)
416
IPv4 Routing