polyrand

import binascii
import sqlite3
import collections
import math
import re

RE_SPLIT = re.compile(r'[^A-Za-z0-9_]+')

def tokenize(s):
    # this is super basic and should be replaced with a real tokenizer

polyrand

README

Create a template service file at /etc/systemd/system/secure-tunnel@.service. The template parameter will correspond to the name of target host:

[Unit]
Description=Setup a secure tunnel to %I
After=network.target

polyrand

Create SSH tunnels using systemd units

Table of contents

• Overview
• Setup the SSH agent systemd unit
• Setup the SSH-tunnel systemd unit
• Create tunnels using systemd services
• Examples
• Create a tunnel to a web server on a machine that's only accessible by SSH

polyrand

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD