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I'm looking for a tool for Linux or Windows that modifies an IP header, to be precise the IP source address. I know it's impossible to get the answer to such a packet since you do not own the IP and back routing will fail but is this possible and how?

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If you need to issue a packet with a different source address than your interface, rather than modify one on th fly, then hping is the tool commonly used. As answered previously, modification is best done by iptables.

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You'll need to create what is essentially a proxy server that will intercept the packets and modify them on the fly if you want this to be real-time. And that proxy server will have to be in a position to successfully intercept everything between your target and the internet or the rest of the network, depending on what sort of network you've got.

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  • I don't think so. How about the case of being a backend server behind a load balancer! You want to modify the source IP so that the client thinks it's the load balancer which sent the request, and obviously you don't want this response to go through the load balancer as it will be a huge botteneck
    – Ayoub Omari
    Jun 12, 2022 at 16:15
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How about something like this?

distinct Networking Tools

Modify and Send Packet. Software developers testing their application are able to capture a packet, quickly modify it to test the various needs of their application and resend it on the network.

The Packet Generator allows users to create a packet for test purposes and send it on the network to test it. The types of packets that can be created are ARP, Ethernet, ICMP, IP, TCP or UDP based. This feature is designed for software engineers to test out their own proprietary protocols by simulating particular situations and for system administrators to check for security holes in their network.

Here's some more information about IP Spoofing.

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  • Sounds like a good tool, but it might be relevant that it's quite expensive.
    – bbaja42
    Oct 11, 2011 at 19:06
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Depending on your needs, iptables in linux could be of help.

Say you have web server on port 8080, but you would like that anyone can access it on standard port 80. It is possible to configure iptables to redirect packet from port 8080 to 80 ( iptables will receive packet on port 80 , modify packets port to 8080 and forward it).

In similar sense, iptables can be configured to changed IP source or IP destination.

Tutorial

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