Chisel – A fast TCP tunnel over HTTP • Hacker News Board

Why TCP over websockets? You can just use the HTTP bodies as a stream in both direction. Which means the proxy just has to strip or add HTTP headers before forwarding. The overhead afterwards is 0 -> you just write to the socket.

Re: Chisel – A fast TCP tunnel over HTTP

#5

Post by badminton1 » Mon, Jan 09, 2017, 6:51 AM UTC

Many superlatives, which immediately raise suspicions.

If you are trying to solve the problem of NAT traversal and such, I suggest you rather attempt to do this:

https://en.wikipedia.org/wiki/TCP_hole_punching

Re: Chisel – A fast TCP tunnel over HTTP

#6

Post by badminton1 » Mon, Jan 09, 2017, 6:55 AM UTC

ryao wrote: post #3

How does this deal with double congestion control?

I was asking myself the same thing. TCP implements many RFCs for congestion control, flow control, etc. Many of them might be redundant if everything is being sent over HTTP (over TCP).

I would use "link conditioner" or a similar tool, simulate packet loss and see how this compares to the other software.

Re: Chisel – A fast TCP tunnel over HTTP

#7

Post by rpcope1 » Mon, Jan 09, 2017, 7:39 AM UTC

badminton1 wrote: post #6

ryao wrote: post #3

How does this deal with double congestion control?

I was asking myself the same thing. TCP implements many RFCs for congestion control, flow control, etc. Many of them might be redundant if everything is being sent over HTTP (over TCP). I would use "link conditioner" or a similar tool, simulate packet loss and see how this compares to the other software.

http://sites.inka.de/sites/bigred/devel/tcp-tcp.html

Even for applications designed to tunnel traffic from the outset (OpenVPN), TCP over TCP is a mess and it's kind of a non-starter for anything that's not a toy (unless you have no other choice, like with certain mobile carriers where path MTU and CGN cause issues).

Re: Chisel – A fast TCP tunnel over HTTP

#8

Post by [deleted] » Mon, Jan 09, 2017, 7:40 AM UTC

[deleted]

Re: Chisel – A fast TCP tunnel over HTTP

#9

Post by buserror » Mon, Jan 09, 2017, 8:03 AM UTC

daurnimator wrote: post #2

Looks to be TCP over websockets; which isn't really that interesting IMO.

Yep, because many firewalls ALSO block websockets; so comparing it to crowbar for speed isn't terribly fair, as crowbar only uses POST/GETs.

Re: Chisel – A fast TCP tunnel over HTTP

#10

Post by noway421 » Mon, Jan 09, 2017, 8:11 AM UTC

Is there any difference with corkscrew? Either way, really keen to test the perfomance of it for getting out of restricted proxies where corkscrew saves me life.