[REBOL] Re: UDP Multicast to TCP
From: lmeyer:bltech:za at: 19-Nov-2009 19:42
Hi
Although the TCPtoMulticast and MulticastToUDP applications are working, we
have picked up an small problem.
The Payload size of the UDP output packets after the conversion does not
seem to be exactly the same as the incoming TCP Payload size (always a
couple of bytes extra). The larger the incoming TCP payload size, the more
bytes seem to be added to the output UDP payload. We have confirmed this
using Windump (windows version of tcpdump).
For example, a 16 bytes TCP payload becomes a 17 bytes UDP payload
A 771 bytes payload becomes a 778 UDP payload. Does anyone have any idea
what could be causing the additional bytes in the UDP payload? Here is the
TCPtoUDP script:
REBOL[Title: "Port 4550"]
listen: open/no-wait tcp://:4550
waitports: [listen]
odata: open udp://239.2.0.80:6550 ; udp broadcast port
set-modes odata [multicast-ttl: 10]
set-modes odata [multicast-interface: 192.168.20.23]
forever [
port: wait waitports
either same? port listen [
active-port: first listen
append waitports active-port
] [
incoming-from-remote: copy port
either incoming-from-remote [
insert odata incoming-from-remote
;print incoming-from-remote
] [
remove find waitports port
close port
]
]
]
Thank you
Leon
PS - I have removed the "read requests" from my email now- sorry if it
caused any problems yesterday.
