Python - set source port number with sockets

Question

I'd like to send a specific UDP broadcast packet. Unfortunately, I need to send the UDP packets from a very specific port.

Let's say I broadcast via UDP "BLABLAH". The server will only answer if my incoming packet source port was 1444; if not, then the packet is discarded.

My broadcast socket setup looks like this:

s = socket(AF_INET,SOCK_DGRAM)

s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)

How can I then set the source port in Python?

Stéphan Kochen · Accepted Answer · 2010-04-22 20:30:02Z

22

You need to bind the socket to the specific port you want to send from. The bind method takes an address tuple, much like connect, though you can use the wildcard address. For example:

s.bind(('0.0.0.0', 1444))

answered Apr 22, 2010 at 20:30

Stéphan Kochen

20k9 gold badges63 silver badges50 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

jweyrich · Accepted Answer · 2010-04-22 20:30:56Z

12

Use s.bind(('', port)).

answered Apr 22, 2010 at 20:30

jweyrich

32.5k5 gold badges70 silver badges101 bronze badges

Collectives™ on Stack Overflow

Python - set source port number with sockets

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related