On Sun, 1 Feb 2009, Derek Tattersall wrote:
In order to become familiar with multicast implementation using FreeBSD, I
found via Google a pair of test programs which multicast sent a simple text
message and received the text message. I added some code to report the
source address, because none of the references that I looked at specified
the source IP address in the frame.
I ran the sender on A -current system, AMD64 vintage last week. The
receiver was on a -current system I386 vintage last week. TCPDUMP shows the
source IP address in the frame as (correctly) 192.168.0.15. The receiver
reports the source IP address as 200.231.191.191. I have also run the same
test with an OpenBSD 4.4 Release I386 system as the receiver. The openBSD
system reports the sender as 192.168.0.15. A Fedora 10 system reported the
source IP address as 0.0.0.0.
Googling the RFCs and other information and referring to Comer's and
Stevens' books on TCPIP I can't determine what should be reported. Does
anybody have clue for me?
Hi Derek:
It might depend on how you're querying the source address. Could you post a
code excerpt?
Robert N M Watson
Computer Laboratory
University of Cambridge
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