74                  ____________________________ Internet

  TRACEROUTE  UDP-  
TTL = 2, . .       
   ,    TTL = 3  . .  
   ,       
.     ,    -
,    ,     , -
     ,   
ICMP Destination Unreachable.      -
  TRACEROUTE.

   UDP-  ICMP-   -
           
 .       .

 TRACEROUTE       
      TCP/IP.  -
         -
 traceroute.   ( ) ,   -
 ,    , 
 , ,   TTL IP- (
    30),   UDP-
 (   3),   ,  -
  (   33434).     -
    www.hill.com.    -
     .  
     .

C:\>tracert www.hill.com

Tracing route to syrup.hill.com [199.182.20.3]
over a maximum of 30 hops:

1   <10 ms    10 ms   <10 ms proxy.mcs.marinform.ru
[195.5.151.49]

2   170 ms   170 ins   160 ms 195.5.151.13

3   301 ms   210 ms   551 ms 195.5.128.113

4   191 ms   190 ms   190 ms bbn-spb2-gw-s0-3.metrocom.ru
[195.5.128.254]

5   330 ms   391 ms   330 ms gin-ppt-bbl.Teleglobe.net
[207.45.206.229]

6   410 ms   471 ms   501 ms gin-nyy-acl.Teleglobe.net
[207.45.199.233]

7   681 ms   821 ms   851 m5 sl-gwl6-pen-2-0.sprintlink.net
[144.228.164.61]