How to send a packet through a specific Inferface ?

Hello!
I have 3 interfaces in my pc : LAN / WLAN / 3G
On LAN I have a global IP.
On WLAN and 3G I'm behind NAT.
I'm coding a program (client+srv) >
I watch a video streaming on LAN then I switch to WLAN or 3G and I want it to happen seamless. So basecly seamless vertical handover is my goal.
Because I'm behind a NAT (3G,WLAN) First I have to send a packet to the server (connection initialization). When the server sends the stream to me it actually sends it to the NAT and the NAT will fwd it to me.
The NAT send the packets back to me only if>
1. the server sends from the same port which it received the request form the NAT
2. It have to send to the same NAT (ip+port) address where the request came from
3. NAT will send then the packet back to my PC to the same port where I sent my request from.
Here comes my big problem!
I have a socket bound to a IP1 and port (e.g. WLAN) if I want to send a packet to an destination IPx for which the route table has the LAN interface as default gateway (IP2), then it will send my packet trough the LAN (IP2) but the source IP will be IP1 in the packet.
Basecly I have a WLAN package on my LAN.
This is bad for me in 2 ways.
1. there won't be a NAT binding for my WLAN
2. the packet won't even make it to the server because the very first router will throw it away since it's source IP is not a LAN IP
SO,
is there a way in Java, to send a packet thorugh a specific interface???
Thx for the kind help!
r0hamkuka

I used NetworkInterface.getNetworkInterfaces() to get all avaliable interfaces. After that I used this: interfaceSocket = new DatagramSocket(6000, interfaceIp); for all my interfaces with different interfaceIp of course
The I tried to send a packet to 153.66.200.155 for example (LAN address) through my WLAN interface (ip for example: 192.168.1.101) using WLAN's interfaceSocket.send()
But the packet goes out on my LAN interface (ip 153.66.200.166) while the src ip is still 192.168.1.101 in the packet. That is why I sad WLAN packet on LAN interface.
I guess the reason is still the routing table. Because routing table tells which IF to use for a destination IP. Of course for dest 153.66.x.x routing table contains 153.66.200.166 as the gateway and not 192.168.1.101. So Win uses this the LAN IF to send the packet.

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--> p_email                                                       *
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w_doc_data-obj_name   = 'SAPRPT'.
w_doc_data-obj_descr = ld_mtitle.
w_doc_data-sensitivty = 'F'.
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REFRESH t_attachment.
t_attachment[] = it_attach[].
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REFRESH t_packing_list.
t_packing_list-transf_bin = space.
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t_packing_list-body_start = 1.
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t_packing_list-doc_type = 'RAW'.
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Create attachment notification
t_packing_list-transf_bin = 'X'.
t_packing_list-head_start = 1.
t_packing_list-head_num   = 1.
t_packing_list-body_start = 1.
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t_packing_list-doc_type   = ld_format.
t_packing_list-obj_descr = ld_attdescription.
t_packing_list-obj_name   = ld_attfilename.
t_packing_list-doc_size   = t_packing_list-body_num * 255.
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CLEAR t_receivers.
REFRESH t_receivers.
t_receivers-receiver = ld_email.
t_receivers-rec_type = 'U'.
t_receivers-com_type = 'INT'.
t_receivers-notif_del = 'X'.
t_receivers-notif_ndel = 'X'.
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            put_in_outbox              = 'X'
            sender_address             = ld_sender_address
            sender_address_type        = ld_sender_address_type
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            document_type_not_exist    = 3
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            parameter_error            = 5
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            enqueue_error              = 7
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Populate zreceiver return code
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Kishore S N

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}Pretty simple, and it works great, if you just want to chat with yourself... ;)
The client is really simple, just sends and receives, nothing fancy.
What I want to know, is how would I send anything any client sends, to every other connected client?
btw, I was wondering if it's good coding practice to put everything into a seperate class like that. I probably could've put everything into one, but it's a little neater in seperate files.
Thanks,
Alex

Can a publish/subscribe sort of model be used in it's
place? Or how about just a listener model rather
than pushing each request? This way the clients just
register themselves and listeners and you merely
propogate an event. There would be no need to keep
track of each IP, etc.
Just thinking out loud here... :)Well, as I understand, on a publish/subscriber model, the publisher has to keep some sort of reference to the listener in order to send the events when they happen.
Keeping the sockets to the clients seems to me as good as a reference can be on a TCP/IP connection short of using RMI to do that, but if the client/server must be decoupled from the language what I sugested is a publish/subscriber model. The clients are the subscribers, they ad themselves as such upon connecting to the server, the server wich is the publisher store their reference as subscribers by keeping the socket where they agreed upon communicating.
When the publisher has a new message to be published it walks the list of references giving them the event, wich is the message posted.
Sure it could be done with events just notifying the arrival of new messages but it would just complicate the model beyond the need. For the client would have to wait for the event and them send a request asking for the actual message, in order to do such a system he would have to create a simple protocol of comunication between the client and the server.
May the code be with you.

How to send a link for a specific podcast file?

So I'm in my Podcasts directory in iTunes 5.0 and I've got a bunch of downloaded podcasts. Just listened to a particular one that I really like and I'd like to send a link for that podcast to a friend. How to get the link? I do a Get Info on the file and there's no URL anywhere.
Even if I manually add a podcast by choosing "Subscribe to podcast" from the Advanced menu, then entering the podcast URL, if I thereafter try to retrieve that URL from somewhere in the downloaded podcast, it's nowhere to be found. Surely I'm missing something obvious. Now there are a very few podcasts that seem to put that info in their "Show Description" (aka the "Podcast Information" window) but they're the exception.
Before you suggest control-clicking in the iTunes Music Store and choosing "Copy iTunes Music Store URL," note that that doesn't get close to the mark at all, and besides, I need to do this for podcasts that aren't on the iTunes Music Store. Thanks!

I should probably give an actual example to make myself clear. When you refer to clicking the "i," note that doing that is what I was talking about when I wrote: "there are a very few podcasts that seem to put that info in their 'Show Description' (aka the 'Podcast Information' window) but they're the exception." In other words, clicking the "i" opens the Podcast Information window. Same window opens if you choose "Show Description" from the contextual menu that opens when you control-click on the feed name.
But the URL that appears in the Podcast Information window (besides not being selectable for copying and also being in a window that disappears if you switch apps), is just the link to the RSS page that lists ALL the episodes. It is not a link to a specific episode. What I want is the ability FROM A DOWNLOADED PODCAST EPISODE to extract the link for that specific episode. I guess this would be equivalent to clicking the "Get" button next to a dimmed episode that has not yet been downloaded, though I don't really care that clicking that link (if I could find it) wouldn't automatically download the episode into iTunes for the person to whom I would send the link.
So, for example, the link that I can extract from the KCRW On the Beat podcast is this:
feed://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStore.woa/wa/podcastRSS?id =73331691
But what I want is to get the link (from within iTunes, not by visiting the web page) of the "Our Pop Stars Lead Us" episode, which is here:
http://66.186.18.80/podcast/mp3/ob/ob050907Afterthe_DelugeOur.mp3
See what I mean?

How to send a packet through a specific Inferface ?

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