Reference Guide

350 | IPv4 Routing
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DNS with traceroute
To configure your switch to perform DNS with traceroute, follow the steps below in the
CONFIGURATION mode.
Figure 16-6 is an example output of DNS using the traceroute command.
Figure 16-6. Traceroute command example
ARP
FTOS uses two forms of address resolution: ARP and Proxy ARP.
Address Resolution Protocol (ARP) runs over Ethernet and enables endstations to learn the MAC
addresses of neighbors on an IP network. Over time, FTOS 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 on ARP, see RFC 826,
An Ethernet Address Resolution Protocol.
Command Syntax Command Mode Purpose
ip domain-lookup
CONFIGURATION Enable dynamic resolution of host names.
ip name-server ip-address
[
ip-address2 ... ip-address6]
CONFIGURATION Specify up to 6 name servers. The order you entered the
servers determines the order of their use.
traceroute [host | ip-address ]
CONFIGURATION 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). To keep the
default setting for those parameters, press the ENTER key.
FTOS#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.force10networks.com (10.11.84.18) 000.000 ms 000.000 ms 000.000 ms