Change IP address in packet capture file (faking IP)

2 minutes

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I’m sure you bumped into situations where you needed to fake IP address in a capture file. This maybe required when you’re trying to send the capture file to someone that you don’t really share your real IP’s with or you just want to change cause you can. If you’ve tried this and looked around the interwebs, you’d surely know that there’s not many guides available and most people would just tell casually “just use sed” or use “WireEdit” and pay some fees for their license. Now, both works but I just got pissed off in a particular situation where sed wasn’t an options (the file was literally few GB’s in size and most text editors would just freeze) and to make things worse, I needed to filter a lot of info and only keep source and destination IP addresses in there for privacy’s sake. Yeah, that means removing all those noises like DNS, UDP, Broadcast, Cisco ARP, Broadcast, MDNS (yes, that too), SSDP … yes, pretty much anything except TCP/UDP, HTTP and TLS trarffic between my server and the destination server. So, in summary I had to filter all of these noises and change IP address in packet capture file to hide source IP address, this is similar to faking IP address in packet captures. You can also use other tools to do it on the fly but they require more setup and all I just wanted to do is to hide my source IP.

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Source: blackMORE Ops – Change IP address in packet capture file (faking IP)

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