interesting...
In setting up a new lab, I discovered something rather interesting today. It seems that you can ping a neighbor device, and get a response back quicker than pinging your own local interface, even when using an extended ping command and specifying that interface is the one to ping, and the one to ping from.
Nothing life changing, just thought it was interesting.
R5_2610_B#show int s1/1
Serial1/1 is up, line protocol is up
Hardware is CD2430 in sync mode
Internet address is 172.0.4.1/24
MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open
Open: CDPCP, IPCP, loopback not set
Keepalive set (10 sec)
Last input 00:00:04, output 00:00:04, output hang never
Last clearing of "show interface" counters 00:29:52
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/32 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 96 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
114 packets input, 7150 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
3 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored, 2 abort
145 packets output, 9995 bytes, 0 underruns
0 output errors, 0 collisions, 49 interface resets
0 output buffer failures, 0 output buffers swapped out
9 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
R5_2610_B#ping 172.0.4.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.0.4.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/32 ms
R5_2610_B#ping 172.0.4.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.0.4.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/58/60 ms
R5_2610_B#ping
Protocol [ip]:
Target IP address: 172.0.4.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 172.0.4.1
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 172.0.4.1, timeout is 2 seconds:
Packet sent with a source address of 172.0.4.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/57/60 ms
R5_2610_B#
