You shouldn't have to trust your upstream routers
No, instead you should be able to verify all of your hardware and software are valid. One way to do this is demand the VHDL and compiled chipset designs for all your hardware. This way one can benchmark things such as power draw or timing characteristics in reality and simulation, allowing some degree of verification that pattern matching code isn't running across your bits.
Unfortunately people are confused by the infinitely reproducible nature of information. This is the first generation of the online Information Age wherein information is infinitely reproducible, not scarce, i.e., we now live in a post information-scarcity world, but the laws and economic concepts are still having growing pains. E.g: If something is in infinite supply, what price does it have? ECON101 says Zero. What's scarce is the ability to create new configurations of bits and make new discoveries, not the ideas or information itself. Instead of agreeing to pay scientists, inventors, and creators well up front for their efforts of creation, their efforts are devalued because corporations would rather cherry pick and pay only that which becomes popular; It takes the same work to create either way. The fallacy is that the mechanic should charge you each time you benefit from his efforts later -- They don't. They do work once and get paid for it once; It's a sane business model since there's an unbounded times one can benefit from the labor to fix the car down the road.
This simple bid, agree on price, do work once, get paid once, and work more to make more money concept is accepted everywhere but the illogical and economically untenable market of research, ideas, and information... So, your in ability to apply basic economic principals to technology is to blame for your current inability to trust your hardware. It's quite poetic, eh? That deception as to the fundamental process of creation breeds a world full of distrust.
Here's an idea for you: Consider that if you connect via HTTPS to, say, Anywhere.com, it could have been compromised and serves you an exploit or backdoor instructions for your router, browser, OS combination.
What good will encryption do you, Mr. Anderson, if you can't trust your system security?
Pick a subset of the system to test for integrity. Now, replace all non consequential input and make it white noise or a no-op on the processing thereof. For a browser you'll process connections and scripts and rendering of HTML but images, text, video, audio, etc. remain unprocessed. If your 'input sanitized' virtualized system state does not match the non 'input sanitized' system state then there is an exploit (information has breeched its containment boundary). If the system states are the same however on the sanitized or not systems then the input is safe to feed to your hardware implementation, so long as the virtual hardware systems are accurate representations of reality, and all their other subsets check out.
The reason why The Unix Way of doing one thing and doing it well is the right way is because one can verify security thus. The complexity of the system sky rockets if scripts can trigger on image data contents, etc. Indeed you wind up with unintended consequences such as cache cookies being able to track you by serving you a unique image, etc. This is also why modern design of information systems is such a train wreck: Your race still treats breeches as features instead of vulnerabilities. The information leaks across your porous "boundaries" like through sieves, and you entertain the ridiculous notion such can be secured. I'm surprised you don't build banks out of tissue paper.
There are more efficient means by which to eliminate any distrust and verify cybernetic integrity, however you humans do not currently possess the technology or even the cognitive language to express them properly yet. You still sell ideas and data as if they're scarce; Like physical things. You're still struggling with your first brush with post-scarcity economics. You're becoming vaguely aware of how primitive you truly are kept, like the encultured apes who laments their lot in life when picking up on hint that human life can be more grand. Integrity has a cost the irrational can not pay. That is your lot in life.