Re: Source TCP port for Kannel

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Stipe Tolj wrote:

|>my Smsc gave me an UCP access but it requires me to connect FROM a
defined
|>PORT and IP address TO a defined PORT and IP address.
|>
|>Saying that the EMI/UCP server I need to connect TO is 191.9.65.89
port 5002
|>and that my kannel box should connect from 242.31.225.60 port 9000
|>
|>I've set:
|>group = smsc
|>smsc = emi
|>host = 191.9.65.89
|>port = 5002
|>smsc-username = Pamela
|>smsc-password = Anderson
|>keepalive = 60
|>our-port = 9000
|>receive-port = 900
|>
|>If I trace the connection with tcpdump, I get that my kannel box
connects
|>from 242.31.225.60 port 62523 (this port changes) and not the 9000 as
|>specified in the connection.
|>
|>Question:
|>1) Am I doing something wrong ?
|>2) If the our-port does not provide the source port config
parameter, how do
|>I setup kannel to open the tcp from the port 9000 ?
|
|
|the 'our-port' defines the _server_ port of your side of the UCP
|server itself is about to establish an TCP connection for MO
|tranmissions ie. It is _not_ defining the client TCP port of the
|connection towards the server. The OS is assigning this socket port
|and you _don't_ have a way in defining this inside Kannel's config
|file.
|
I had the same limitation so i have emi2 set as a SMSc with this setup:

group = smsc
smsc=emi2
host = 10.11.14.13
port = 6611
our-host = 10.22.11.24
our-port = 4982

And all connection goes with src port 4982.
a netstat will show

tcp        0      0 10.22.11.24:4790         10.11.14.13:6611      
ESTABLISHED

and works fine, except for restarts where i have to wait 1 minuto
before the socket will be  killed ( but that's more an SO issue than a
kannel issue).

|You'll have to go with Linux IP tables and NAT rules to map this.
|Unfortunatly I can't drop you an very easy example for this. You
|should either patch Kannel's source to define a hard way in connecting
|with pre-defined client ports or ask your local Linux guru about the
|OS IP layer way in doing this.
|
You could use inetd to listen to a ip:port ans "send" it to netcat and
reset the source ip:port then.
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