September 2003
Intermediate to advanced
304 pages
8h 39m
English
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Using vtun over SSH
Connect two networks together using vtun and a single SSH connection.
vtun
is a user space tunnel server,
allowing entire networks to be tunneled to each other using the tun
universal tunnel kernel driver. Using an encrypted tunnel such as
vtun allows roaming wireless clients to secure all of their IP
traffic using strong encryption. It currently runs
under Linux, BSD, and Mac OS X. These examples assume that you are
using Linux.
The procedure described next will allow a host with a private IP address (10.42.4.6) to bring up a new tunnel interface with a real, live routed IP address (208.201.239.33) that works as expected, as if the private network weren’t even there. Do this by bringing up the tunnel, dropping the default route, then adding a new default route via the other end of the tunnel.
To begin with, here is the (pretunneled) configuration of the network:
root@client:~#ifconfig eth2eth2 Link encap:Ethernet HWaddr 00:02:2D:2A:27:EA inet addr:10.42.3.2 Bcast:10.42.3.63 Mask:255.255.255.192 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:662 errors:0 dropped:0 overruns:0 frame:0 TX packets:733 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:105616 (103.1 Kb) TX bytes:74259 (72.5 Kb) Interrupt:3 Base address:0x100 root@client:~#routeKernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.42.3.0 * 255.255.255.192 U 0 0 0 eth2 loopback * 255.0.0.0 U 0 0 0 lo default 10.42.3.1 0.0.0.0 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.