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source address of ping
*A:SRC_R6# show router route-table
===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags] Type Proto Age Pref
Next Hop[Interface Name] Metric
-------------------------------------------------------------------------------
0.0.0.0/0 Remote Static 01h03m48s 5
10.2.6.2 1
10.2.6.0/27 Local Local 01h03m48s 0
int_to_r2 0
10.10.10.6/32 Local Local 02h11m34s 0
system 0
192.168.20.0/24 Local Local 01h21m15s 0
vprn10_r6 0
-------------------------------------------------------------------------------
No. of Routes: 4
Flags: L = LFA nexthop available B = BGP backup route available
n = Number of times nexthop is repeated
===============================================================================
*A:SRC_R6# ping 192.168.10.1 source 192.168.20.1
PING 192.168.10.1 56 data bytes
64 bytes from 192.168.10.1: icmp_seq=1 ttl=62 time=3.84ms.
64 bytes from 192.168.10.1: icmp_seq=2 ttl=62 time=3.81ms.
64 bytes from 192.168.10.1: icmp_seq=3 ttl=62 time=3.72ms.
64 bytes from 192.168.10.1: icmp_seq=4 ttl=62 time=3.64ms.
64 bytes from 192.168.10.1: icmp_seq=5 ttl=62 time=4.04ms.
---- 192.168.10.1 PING Statistics ----
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min = 3.64ms, avg = 3.81ms, max = 4.04ms, stddev = 0.137ms
*A:SRC_R6# ping 192.168.10.1 source 10.2.6.6
PING 192.168.10.1 56 data bytes
64 bytes from 192.168.10.1: icmp_seq=1 ttl=62 time=3.91ms.
64 bytes from 192.168.10.1: icmp_seq=2 ttl=62 time=2.85ms.
64 bytes from 192.168.10.1: icmp_seq=3 ttl=62 time=2.76ms.
64 bytes from 192.168.10.1: icmp_seq=4 ttl=62 time=2.68ms.
64 bytes from 192.168.10.1: icmp_seq=5 ttl=62 time=3.59ms.
*A:SRC_R6# debug router ip icmp
*A:SRC_R6# ping 192.168.10.1 source 10.2.6.6
PING 192.168.10.1 56 data bytes
1 2014/08/04 21:20:10.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.2.6.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
2 2014/08/04 21:20:10.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP ingressing on int_to_r2:
192.168.10.1 -> 10.2.6.6
type: Echo Reply (0) code: No Code (0)
"
64 bytes from 192.168.10.1: icmp_seq=1 ttl=62 time=3.14ms.
3 2014/08/04 21:20:11.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.2.6.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
4 2014/08/04 21:20:11.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP ingressing on int_to_r2:
192.168.10.1 -> 10.2.6.6
type: Echo Reply (0) code: No Code (0)
"
64 bytes from 192.168.10.1: icmp_seq=2 ttl=62 time=3.06ms.
5 2014/08/04 21:20:12.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.2.6.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
6 2014/08/04 21:20:12.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP ingressing on int_to_r2:
192.168.10.1 -> 10.2.6.6
type: Echo Reply (0) code: No Code (0)
"
64 bytes from 192.168.10.1: icmp_seq=3 ttl=62 time=2.97ms.
7 2014/08/04 21:20:13.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.2.6.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
8 2014/08/04 21:20:13.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP ingressing on int_to_r2:
192.168.10.1 -> 10.2.6.6
type: Echo Reply (0) code: No Code (0)
"
64 bytes from 192.168.10.1: icmp_seq=4 ttl=62 time=2.89ms.
9 2014/08/04 21:20:14.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.2.6.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
10 2014/08/04 21:20:14.44 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP ingressing on int_to_r2:
192.168.10.1 -> 10.2.6.6
type: Echo Reply (0) code: No Code (0)
"
64 bytes from 192.168.10.1: icmp_seq=5 ttl=62 time=2.80ms.
---- 192.168.10.1 PING Statistics ----
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min = 2.80ms, avg = 2.97ms, max = 3.14ms, stddev = 0.120ms
*A:SRC_R6# ping 192.168.10.1 source 10.10.10.6
PING 192.168.10.1 56 data bytes
11 2014/08/04 21:23:58.16 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.10.10.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
12 2014/08/04 21:23:59.16 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.10.10.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
"
Request timed out. icmp_seq=1.
Request timed out. icmp_seq=2.
Request timed out. icmp_seq=3.
Request timed out. icmp_seq=4.
Request timed out. icmp_seq=5.
---- 192.168.10.1 PING Statistics ----
5 packets transmitted, 0 packets received, 100% packet loss
*A:SRC_R6# ping 192.168.10.1
PING 192.168.10.1 56 data bytes
16 2014/08/04 21:24:22.22 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.10.10.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
17 2014/08/04 21:24:23.22 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.10.10.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
18 2014/08/04 21:24:24.22 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.10.10.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
19 2014/08/04 21:24:25.22 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.10.10.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
20 2014/08/04 21:24:26.22 EST MINOR: DEBUG #2001 Base PIP
"PIP: ICMP
instance 1 (Base), interface index 3 (int_to_r2),
ICMP egressing on int_to_r2:
10.10.10.6 -> 192.168.10.1
type: Echo (8) code: No Code (0)
"
Request timed out. icmp_seq=1.
Request timed out. icmp_seq=2.
Request timed out. icmp_seq=3.
Request timed out. icmp_seq=4.
Request timed out. icmp_seq=5.
---- 192.168.10.1 PING Statistics ----
5 packets transmitted, 0 packets received, 100% packet loss
*A:SRC_R6# ping 192.168.10.1
so, the default source address of ping is the address of interface system.