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UNIX Unleashed, System Administrator's Edition phần 3

Nhóc $ / etc / ping 100 10 PING brat.pencom.com: 100 byte gói tin - nhóc pencom.com PING Thống kê-10 gói dữ liệu truyền, 0 gói, mất gói tin 100% Trong ví dụ đầu tiên, số 100 nói sử dụng 100 byte dữ liệu trong mỗi tin nhắn và 10 nói để sử dụng 10 tin nhắn. | PING conch.pencom.com 100 byte packets 100 bytes from 198.3.200.86 icmp_seq 0. time 3. ms 100 bytes from 198.3.200.86 icmp_seq 1. time 4. ms 100 bytes from 198.3.200.86 icmp_seq 2. time 3. ms 100 bytes from 198.3.200.86 icmp_seq 3. time 5. ms 100 bytes from 198.3.200.86 icmp_seq 4. time 4. ms 100 bytes from 198.3.200.86 icmp_seq 5. time 8. ms 100 bytes from 198.3.200.86 icmp_seq 6. time 3. ms 100 bytes from 198.3.200.86 icmp_seq 7. time 3. ms 100 bytes from 198.3.200.86 icmp_seq 8. time 3. ms 100 bytes from 198.3.200.86 icmp_seq 9. time 3. ms conch.pencom.com PING Statistics-- 10 packets transmitted 10 packets received 0 packet loss round-trip ms min avg max 3 3 8 etc ping brat 100 10 PING brat.pencom.com 100 byte packets --brat.pencom.com PING Statistics-- 10 packets transmitted 0 packets received 100 packet loss In the first example the 10 0 says to use 100 bytes of data in each message and the 10 says to use 10 messages. All 10 message were returned. The second example shows what happens when you attempt to ping a host that is not up. Once you determine that the remote host is not responding you can either attempt to get the machine back up or wait until later to use it. If the machine is on your LAN it should be fairly easy to go to it and start it running or talk to a local administrator. If the machine is somewhere remote you may need to phone or e-mail someone to get assistance. If the machine is a resource on the Internet that is offered by some other school or company you should probably just wait until it is running again unless your need is urgent for both you and the remote administrator . Summary In this chapter you have learned how UNIX machines are networked and how to take advantage of that networking. You have learned to log in to remote machines copy files begin to surf the Internet and troubleshoot minor problems. By using these network services you will be able to perform useful work on networked systems and explore the information superhighway.