qr code c# sample Basic Troubleshooting in Objective-C

Printing Quick Response Code in Objective-C Basic Troubleshooting

Basic Troubleshooting
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TABLE 17-4
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Ping Output
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! U N P Q M A &
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Explanation
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A response was not received before the timeout period expired A response was received within the timeout period A remote router responded that the destination is unreachable the network segment is reachable, but not the host A remote router responded that the network is unreachable the network cannot be found in the routing table A remote device responded that the protocol is not supported Source quench, telling the source to slow its output The ping packet needed to be fragmented, but a remote router couldn t perform fragmentation The ping packet was filtered by a device with an access control list (administratively prohibited) The ping packet type is not understood by a remote device The ping exceeded the maximum number of hops supported by the routing protocol (see 19)
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Output Codes for the ping Commands
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You might see a period () in the output for a couple of reasons: a response was received, but after the timeout period; or no response was seen at all If a response was received, but after the timeout period, this might be because an ARP had to take place to learn the MAC address of a connected device or because of congestion and this process could have occurred on multiple segments Consider two examples: !!!! and !!! If devices have to perform ARPs to get the MAC address of the next-hop device, you ll typically see the first example in your output However, if your output looks like the second example, you re probably experiencing congestion or performance problems
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Be familiar with the output descriptors used by the ping command in Table 17-4
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Extended ping Command IOS devices support an extended ping command, which can be executed only at Privilege EXEC mode
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17: IOS Device Management
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1710The CD contains a multimedia demonstration of using the simple and extended ping commands on a router To execute this command, just type ping by itself on the command line:
Router# ping Protocol [ip]: Target IP address: 192168110 Repeat count [5]: Datagram size [100]: Timeout in seconds [2] Extended commands [n]: y Source address: Type of service [0]: Set DF bit in IP header [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Number of hops [9]: Loose, Strict, Record, Timestamp, Verbose[RV]: Sweep range of sizes [n]: Type escape sequence to abort Sending 5, 100-byte ICMP Echos to 192168110, timeout is 2 seconds:
Following is an explanation of the parameters that might be required when you execute this command:
Protocol
The protocol to use for the ping (defaults to IP) The IP address or hostname of the destination to
Target IP address
test
Repeat count
How many echo requests should be generated for the test The size, in bytes, of the ping packet (defaults to 100)
(defaults to 5)
Datagram size Timeout in seconds
The amount of time to wait before indicating a timeout for the echo (defaults to 2 seconds) When seeing a mix of periods and bangs in the displayed output, increasing this value can help determine if you are experiencing congestion problems with a slow response time between your IOS device and the destination
Basic Troubleshooting
Extended commands Source address
Whether or not the remaining questions should also be asked (defaults to no) The IP address that should appear as the source address in the IP header (defaults to the IP address of the interface the ping will use to exit the IOS device) The IP level for QoS (defaults to 0) Whether or not the ping can be fragmented when it reaches a segment that supports a smaller MTU size (the default is no don t set this bit) Sometimes a misconfigured MTU can cause performance problems You can use this parameter to pinpoint the problem, since a device with a smaller MTU size will not be able to handle the larger packet The data pattern that is placed in the ping It is a hexadecimal four-digit (16-bit) number (defaults to 0xABCD) and is used to solve cable problems and crosstalk on cables IP header options (defaults to none of these) The record parameter records the route that the ping took this is somewhat similar to traceroute If you choose record, you will be asked for the maximum number of hops that are allowed to be recorded by the ping (defaults to 9, and can range from 1 to 9) Send pings that vary in size This is helpful when trying to troubleshoot a problem related to a segment that has a small MTU size (and you don t know what that number is) This defaults to n for no
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