Just pulled out my windows 7 laptop and my netstat gives internal connections from 127.0.0.1 and external ones from the 192.*.*.* address (aka 10.*.*.* on some networks).

https://kb.netgear.com/27476/How-do-I-set-a-static-IP-address-in-Windows is what I found for trying to change an IP address, there are potentially some settings that will say what address your computer sinks it has - just look at the router and make sure the first three numbers are the same (some are 192.168.0.1 and some are 192.168.1.1, go with a static ip like 192.168.0.145 if you wantt o set one and try this again).

If that deosn't work this wallet software isn't covered very much on the internet so I'm not sure there's much I can offer, you could try contacting the developer on the git repo to see if they have a solution (I know you mentioned it on stackoverflow).

---

Generally a lot of packets are sent with something so that your machine can identify it's for them even if they share an ip address with another machine so I'm not sure why this isn't working in this instance (maybe the program trying to save cpu time).