CODEWITHSUNDEEP
linuxsocketsudp
user3571278
user3571278

Reputation: 751

how to spoof outgoing UDP socket port number in linux?

The question is the title. But I'd like to describe my problem so that someone can suggest an alternative solution. I know that when the client sends a message on a socket to 12.34.56.78:40, the router on the client's side sets a rule for some time that any data received from the 12.34.56.78:40 is allowed and will be sent to the client machine on the network. so the problem I have is that the client is sending to the server on some port but the server needs to reply using a different socket (thus a different port). but ofcourse the server's ip didnt change. so that was my first idea of solving the problem spoof the outgoing port

Upvotes: 1

Views: 572

Answers (1)

Hugh White
Hugh White

Reputation: 488

Multiple sockets can bind to the same port, and thus send packets with the same source port number, if the each socket sets the SO_REUSEPORT socket option. See the SO_REUSEPORT socket option and the difference between SO_REUSEADDR and SO_REUSEPORT.

Upvotes: 1

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