Extended Ping

[jeff.koh]

hi ppl,

can i know what does the following statement mean? I dont really understand about using the extended ping...

"Its essential that the two IP addresses used in the neighbor command of the peer routers be able to reach one another. One sure way to verify reachability is an extended ping between the two IP addresses. The extended ping forces the pinging router to use as source the IP address specified in the neighbor command rather than the IP address of the interface the packet is going out from."

thanks!!

[bbranch]

If you were using loopback interfaces (or a different interface to the outgoing interface for the ping) for your peering then a standard ping would use the outgoing interface address as the source address, as such you would not be verifing connectivity between the two peer addresses. By using an extended ping you can select the interface address to be used as the source address for the ping, by setting this to the address of the peer you can verify connectivity between the two peer addresses.

[olorunloba]

to do an extended ping, you type ping leaving the address. You then have options to spcify the other parameters. For example:

Router#ping

Protocol [ip]:

Target IP address: 1.1.1.1

Repeat count [5]:

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]: y

Source address or interface: 1.1.1.2

Type of service [0]:

Set DF bit in IP header? [no]:

Validate reply data? [no]:

Data pattern [0xABCD]:

Loose, Strict, Record, Timestamp, Verbose[none]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:

....