Računarske mreže 1 Ruteri

ICMP Echo Request/reply - ping• Host/ruter može da pošalje ICMP Echo Request na proizvoljnu IP adresu• Uređaj koji primi ICMP Echo Request paket, odgovara izvorišnom uređajusa ICMP Echo Reply paketom• Ping komanda (Windows, Linux, ruteri)– šalje određeni broj ICMP Echo Request paketa– prihvata ICMP Echo Reply pakete u odgovorima– kao rezultat daje broj poslatih i primljenih paketa, procenat izgubljenih paketa,vreme između slanja i prijema paketa (Round Trip Time)ETF, Katedra za računarsku tehniku i informatiku43Ping• Osnovni servis za proveru rutiranja, odnosno dostupnosti IP uređaja namreži (reachability)amres-core-R>ping www.google.comTranslating "www.google.com"...domain server (147.91.1.5) [OK]Sending 5, 100-byte ICMP Echos to 64.233.183.104, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 32/33/36 msamres-core-R>C:\Documents and Settings>ping www.google.comPinging www.l.google.com [64.233.183.147] with 32 bytes of data:Reply from 64.233.183.147: bytes=32 time=32ms TTL=243Reply from 64.233.183.147: bytes=32 time=33ms TTL=243Reply from 64.233.183.147: bytes=32 time=32ms TTL=243Reply from 64.233.183.147: bytes=32 time=33ms TTL=243Ping statistics for 64.233.183.147:Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds:Minimum = 32ms, Maximum = 33ms, Average = 32msLinux# ping www.google.comPING www.l.google.com (64.233.183.104) 56(84) bytes of data.64 bytes from nf-in-f104.google.com (64.233.183.104): icmp_seq=1 ttl=242 time=66.1 ms64 bytes from nf-in-f104.google.com (64.233.183.104): icmp_seq=2 ttl=242 time=65.6 ms64 bytes from nf-in-f104.google.com (64.233.183.104): icmp_seq=3 ttl=242 time=65.5 ms64 bytes from nf-in-f104.google.com (64.233.183.104): icmp_seq=4 ttl=242 time=65.8 ms64 bytes from nf-in-f104.google.com (64.233.183.104): icmp_seq=5 ttl=242 time=65.6 msETF, Katedra za računarsku tehniku i informatiku--- www.l.google.com ping statistics ---5 packets transmitted, 5 received, 0% packet loss, time 4002msrtt min/avg/max/mdev = 65.595/65.780/66.161/0.391 ms4422