Problems using the extended ping command

When I try to use the extended ping command and specify a source IP address
I am receiving an 'invalid source' error. I have tried many different
combinations but with no joy, it does, however, work if I specify an
iterface (such as serial 0). I've also tried this on my 2611 router with
the same results, even if I type '?' at the 'source address' prompt I still
receive an eror message - does anyone have any ideas?

TIA, Jase


EAGLE2#ping
Protocol [ip]:
Target IP address: 192.168.1.2
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 192.168.3.2
% Invalid source
Source address or interface: 10.0.0.1
% Invalid source
Source address or interface: serial 0
Type of service [0]:
Set DF bit in IP header? [no]:


EAGLE2 uptime is 24 minutes
System restarted by reload
System image file is "flash:c2500-d-l_120-11.bin"

cisco 2500 (68030) processor (revision L) with 6144K/2048K bytes of memory.
Processor board ID 06110204, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
1 Token Ring/IEEE 802.5 interface(s)
2 Serial network interface(s)
1 ISDN Basic Rate interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)

Configuration register is 0x2102