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Asked: 2026-05-21T14:51:54+00:00

I’ve two pc using VRRP for redundancy. So every PC (Linux) has a physical

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I’ve two pc using VRRP for redundancy. So every PC (Linux) has a physical and a Virtual IP address.

I’ve a software (C++) with a client/server architecture with UDP protocol. The software bind the listen socket on “0.0.0.0” and use a new socket every time it needs to send some data to the other party. With wireshark I saw that when it sends data the source IP is the phisycal one…
How can I set the source address of the sending socket to the Virtual one??

NOTE: Whit ifconfig I see only eth0 with the physical address…

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1 Answer

  1. Editorial Team

    When the kernel needs to send something through a socket it performs these steps

    • if the socket is bound, use that source address
    • is the socket is not bound, it looks around for interfaces and selects a source address

    So you need to bind(2) your socket to your desired address. For more information: "Source Address Selection" in chapter "IP Routing" of "Guide to IP Layer Network Administration with Linux".

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