December 2001
Intermediate to advanced
608 pages
25h 14m
English
Content preview from CISCO IOS in a Nutshell
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Name
ping — command
Synopsis
ping
ping host
Description
The ping command sends a sequence of ICMP echo
request packets to the specified host. It
is one of the simplest and most commonly used troubleshooting tools.
If you omit the host from the command line and are in privileged EXEC
mode, the router prompts you for the rest of the information.
Ping prints a special character for each packet indicating whether the router received the corresponding echo reply. Table 15-14 shows what these special characters mean. Ping also summarizes the success rate and the round-trip times.
Table 17-1. Ping success codes
|
Character |
Meaning |
|---|---|
|
! |
Ping successful |
|
. |
Timed out waiting for reply |
|
? |
Unknown packet |
|
& |
TTL of packet was exceeded |
|
A |
Access list denied packet |
|
C |
Network congestion |
|
I |
User interrupt (if you hit CTRL+^) |
|
U |
Destination unreachable |
Example
Router# ping 10.10.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.10.1.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.