User`s manual

111
DWS-1008 User’s Manual
D-Link Systems, Inc.
Conguring and Managing IP Interfaces and Services
The traceroute facility determines the address of the rst hop by examining the source address
eld of the ICMP time-exceeded message.
To identify the next hop, traceroute again sends a UDP packet, but this time with a TTL
value of 2. The rst router decrements the TTL eld by 1 and sends the datagram to the next
router. The second router sees a TTL value of 1, discards the datagram, and returns the Time
Exceeded message to the source. This process continues until the TTL is incremented to a
value large enough for the datagram to reach the destination host (or until the maximum TTL
is reached).
To determine when a datagram has reached its destination, traceroute sets the UDP destination
port in the datagram to a very large value, one that the destination host is unlikely to be using.
In addition, when a host receives a datagram with an unrecognized port number, it sends an
ICMP Port Unreachable error to the source. This message indicates to the traceroute facility
that it has reached the destination.
To trace a route to a destination subnet, use the following command:
traceroute host [dnf] [no-dns] [port port-num] [queries num] [size size] [ttl hops]
[wait ms]
To trace the route to host server1, type the following command:
DWS-1008# traceroute server1
traceroute to server1.example.com (192.168.22.7), 30 hops max, 38 byte packets
1 engineering-1.example.com (192.168.192.206) 2 ms 1 ms 1 ms
2 engineering-2.example.com (192.168.196.204) 2 ms 3 ms 2 ms
3 gateway_a.example.com (192.168.1.201) 6 ms 3 ms 3 ms
4 server1.example.com (192.168.22.7) 3 ms * 2 ms
In this example, server1 is four hops away. The hops are listed in order, beginning with the
hop that is closest to the Switch and ending with the route’s destination.
IP Interfaces and Services Conguration Scenario
This scenario congures IP interfaces, assigns one of the interfaces to be the system IP
address, and congures a default route, DNS parameters, and time and date parameters.
1. Congure IP interfaces on the mgmt and roaming VLANs, and verify the conguration
changes. Type the following commands:
DWS-1008# set interface mgmt ip 10.10.10.10/24
success: change accepted.
DWS-1008# set interface roaming ip 10.20.10.10/24
success: change accepted.
DWS-1008# show interface