cac ban co the chi cho minh cach chia VLAN cho SW cisco 2950?
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Câu hỏi về các thông số của lệnh ping
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[root@localhost /]# ping cisco.com
PING cisco.com (198.133.219.25) 56(84) bytes of data.
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=0 ttl=110 time=236 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=1 ttl=110 time=235 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=2 ttl=110 time=239 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=5 ttl=110 time=236 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=6 ttl=110 time=244 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=7 ttl=110 time=246 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=9 ttl=110 time=278 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=10 ttl=110 time=249 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=11 ttl=110 time=243 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=14 ttl=110 time=240 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=15 ttl=110 time=390 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=18 ttl=110 time=240 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=19 ttl=110 time=244 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=22 ttl=110 time=243 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=23 ttl=110 time=241 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=26 ttl=110 time=240 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=27 ttl=110 time=241 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=28 ttl=110 time=246 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=30 ttl=110 time=239 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=31 ttl=110 time=241 ms
64 bytes from www.cisco.com (198.133.219.25): icmp_seq=32 ttl=110 time=234 ms
--- cisco.com ping statistics ---
34 packets transmitted, 21 received, 38% packet loss, time 33425ms
rtt min/avg/max/mdev = 234.963/250.206/390.719/32.616 ms, pipe 2
[root@localhost /]# ping vnpro.org
PING vnpro.org (67.138.240.8) 56(84) bytes of data.
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=0 ttl=46 time=249 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=1 ttl=46 time=246 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=2 ttl=45 time=249 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=3 ttl=45 time=246 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=4 ttl=45 time=251 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=5 ttl=46 time=246 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=6 ttl=46 time=246 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=7 ttl=45 time=243 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=8 ttl=46 time=244 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=9 ttl=46 time=242 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=10 ttl=46 time=243 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=11 ttl=46 time=242 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=12 ttl=45 time=259 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=13 ttl=46 time=250 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=14 ttl=46 time=246 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=15 ttl=46 time=243 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=16 ttl=46 time=242 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=17 ttl=46 time=248 ms
64 bytes from box8.bluehost.com (67.138.240.8): icmp_seq=18 ttl=46 time=249 ms
--- vnpro.org ping statistics ---
19 packets transmitted, 19 received, 0% packet loss, time 19195ms
rtt min/avg/max/mdev = 242.094/247.063/259.530/4.142 ms, pipe 2
Các bạn thử theo dõi hai thí nghiệm trên và có thể rút ra được các thông số của lệnh Ping.
Trên Linux, lệnh ping còn kèm theo 1 trường là icmp_seq. Bác nào nói rõ hơn về nó được không?
Còn ttl - Time to live không phải là thời gian, có trường thời gian riêng.
Các bác có thể phân tích và chỉ ra cách tính trường time cũng như trường icmp_seq được không?
Thân.Never Gone - Never Far
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Originally posted by ciscautheo minh nghi la truong icmp_seq chi la truong danh so theo thu tu thoi
Còn trường time: công thức tính thế nào? thời gian time=xxx thì xxx là thời gian của packet đi từ host gửi icmp packet đến destination hay là thời gian trung bình của ping + pong?Never Gone - Never Far
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