Theoretical paper without implementation and results
There is an academic field called theoretical computer science (TCS), which lies at the border of math and CS.  There are lots of venues for work in this area.  However the motto for TCS is certainly not "We couldn't do the implementation, so we decided to make it theoretical"!  I am by no means an expert in TCS (I know just a little more than absolute zero), but I don't think that computer networks is a key TCS topic: it sounds more applied than that.  (I just checked this wikipedia article, which seems to largely support my position.  Obviously an expert opinion would be better here.)

My advice to you is to find someone else to help you with the implementation / experimental part so that you can carry out your research along the lines you originally envisaged and not theoretically-as-a-consolation-prize.  How can you do this?  You could (try the things at the top of the list first):


Ask people in your department.  Even if they do not have the skills themselves, there are more of them than you so the chances they know someone who does will increase.
Ask about it on the internet, including various SE sites.
Attend relevant conferences and seek out people with this expertise.
Visit another department and/or a specific person whom you think can help.
Write up a preliminary version of your work which only does the theoretical part and makes clear that you are looking for someone to help with the implementation.  Post this work on your webpage / the arxiv / some (presumably not top tier) conference.